Code Examples¶
A number of examples are included in the source distribution of Reticulum. You can use these examples to learn how to write your own programs.
Minimal¶
The Minimal example demonstrates the bare-minimum setup required to connect to a Reticulum network from your program. In about five lines of code, you will have the Reticulum Network Stack initialised, and ready to pass traffic in your program.
##########################################################
# This RNS example demonstrates a minimal setup, that #
# will start up the Reticulum Network Stack, generate a #
# new destination, and let the user send an announce. #
##########################################################
import argparse
import sys
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this basic example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
# This initialisation is executed when the program is started
def program_setup(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our example
identity = RNS.Identity()
# Using the identity we just created, we create a destination.
# Destinations are endpoints in Reticulum, that can be addressed
# and communicated with. Destinations can also announce their
# existence, which will let the network know they are reachable
# and automatically create paths to them, from anywhere else
# in the network.
destination = RNS.Destination(
identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"minimalsample"
)
# We configure the destination to automatically prove all
# packets addressed to it. By doing this, RNS will automatically
# generate a proof for each incoming packet and transmit it
# back to the sender of that packet. This will let anyone that
# tries to communicate with the destination know whether their
# communication was received correctly.
destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
# Everything's ready!
# Let's hand over control to the announce loop
announceLoop(destination)
def announceLoop(destination):
# Let the user know that everything is ready
RNS.log(
"Minimal example "+
RNS.prettyhexrep(destination.hash)+
" running, hit enter to manually send an announce (Ctrl-C to quit)"
)
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program gets run at startup,
# and parses input from the user, and then starts
# the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(
description="Minimal example to start Reticulum and create a destination"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
program_setup(configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Minimal.py.
Announce¶
The Announce example builds upon the previous example by exploring how to announce a destination on the network, and how to let your program receive notifications about announces from relevant destinations.
##########################################################
# This RNS example demonstrates setting up announce #
# callbacks, which will let an application receive a #
# notification when an announce relevant for it arrives #
##########################################################
import argparse
import random
import sys
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this basic example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
# We initialise two lists of strings to use as app_data
fruits = ["Peach", "Quince", "Date", "Tangerine", "Pomelo", "Carambola", "Grape"]
noble_gases = ["Helium", "Neon", "Argon", "Krypton", "Xenon", "Radon", "Oganesson"]
# This initialisation is executed when the program is started
def program_setup(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our example
identity = RNS.Identity()
# Using the identity we just created, we create two destinations
# in the "example_utilities.announcesample" application space.
#
# Destinations are endpoints in Reticulum, that can be addressed
# and communicated with. Destinations can also announce their
# existence, which will let the network know they are reachable
# and automatically create paths to them, from anywhere else
# in the network.
destination_1 = RNS.Destination(
identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"announcesample",
"fruits"
)
destination_2 = RNS.Destination(
identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"announcesample",
"noble_gases"
)
# We configure the destinations to automatically prove all
# packets addressed to it. By doing this, RNS will automatically
# generate a proof for each incoming packet and transmit it
# back to the sender of that packet. This will let anyone that
# tries to communicate with the destination know whether their
# communication was received correctly.
destination_1.set_proof_strategy(RNS.Destination.PROVE_ALL)
destination_2.set_proof_strategy(RNS.Destination.PROVE_ALL)
# We create an announce handler and configure it to only ask for
# announces from "example_utilities.announcesample.fruits".
# Try changing the filter and see what happens.
announce_handler = ExampleAnnounceHandler(
aspect_filter="example_utilities.announcesample.fruits"
)
# We register the announce handler with Reticulum
RNS.Transport.register_announce_handler(announce_handler)
# Everything's ready!
# Let's hand over control to the announce loop
announceLoop(destination_1, destination_2)
def announceLoop(destination_1, destination_2):
# Let the user know that everything is ready
RNS.log("Announce example running, hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
# Randomly select a fruit
fruit = fruits[random.randint(0,len(fruits)-1)]
# Send the announce including the app data
destination_1.announce(app_data=fruit.encode("utf-8"))
RNS.log(
"Sent announce from "+
RNS.prettyhexrep(destination_1.hash)+
" ("+destination_1.name+")"
)
# Randomly select a noble gas
noble_gas = noble_gases[random.randint(0,len(noble_gases)-1)]
# Send the announce including the app data
destination_2.announce(app_data=noble_gas.encode("utf-8"))
RNS.log(
"Sent announce from "+
RNS.prettyhexrep(destination_2.hash)+
" ("+destination_2.name+")"
)
# We will need to define an announce handler class that
# Reticulum can message when an announce arrives.
class ExampleAnnounceHandler:
# The initialisation method takes the optional
# aspect_filter argument. If aspect_filter is set to
# None, all announces will be passed to the instance.
# If only some announces are wanted, it can be set to
# an aspect string.
def __init__(self, aspect_filter=None):
self.aspect_filter = aspect_filter
# This method will be called by Reticulums Transport
# system when an announce arrives that matches the
# configured aspect filter. Filters must be specific,
# and cannot use wildcards.
def received_announce(self, destination_hash, announced_identity, app_data):
RNS.log(
"Received an announce from "+
RNS.prettyhexrep(destination_hash)
)
if app_data:
RNS.log(
"The announce contained the following app data: "+
app_data.decode("utf-8")
)
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program gets run at startup,
# and parses input from the user, and then starts
# the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(
description="Reticulum example that demonstrates announces and announce handlers"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
program_setup(configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Announce.py.
Broadcast¶
The Broadcast example explores how to transmit plaintext broadcast messages over the network.
##########################################################
# This RNS example demonstrates broadcasting unencrypted #
# information to any listening destinations. #
##########################################################
import sys
import argparse
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this basic example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
# This initialisation is executed when the program is started
def program_setup(configpath, channel=None):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# If the user did not select a "channel" we use
# a default one called "public_information".
# This "channel" is added to the destination name-
# space, so the user can select different broadcast
# channels.
if channel == None:
channel = "public_information"
# We create a PLAIN destination. This is an uncencrypted endpoint
# that anyone can listen to and send information to.
broadcast_destination = RNS.Destination(
None,
RNS.Destination.IN,
RNS.Destination.PLAIN,
APP_NAME,
"broadcast",
channel
)
# We specify a callback that will get called every time
# the destination receives data.
broadcast_destination.set_packet_callback(packet_callback)
# Everything's ready!
# Let's hand over control to the main loop
broadcastLoop(broadcast_destination)
def packet_callback(data, packet):
# Simply print out the received data
print("")
print("Received data: "+data.decode("utf-8")+"\r\n> ", end="")
sys.stdout.flush()
def broadcastLoop(destination):
# Let the user know that everything is ready
RNS.log(
"Broadcast example "+
RNS.prettyhexrep(destination.hash)+
" running, enter text and hit enter to broadcast (Ctrl-C to quit)"
)
# We enter a loop that runs until the users exits.
# If the user hits enter, we will send the information
# that the user entered into the prompt.
while True:
print("> ", end="")
entered = input()
if entered != "":
data = entered.encode("utf-8")
packet = RNS.Packet(destination, data)
packet.send()
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program gets run at startup,
# and parses input from the user, and then starts
# the program.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(
description="Reticulum example demonstrating sending and receiving broadcasts"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"--channel",
action="store",
default=None,
help="broadcast channel name",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.channel:
channelarg = args.channel
else:
channelarg = None
program_setup(configarg, channelarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Broadcast.py.
Echo¶
The Echo example demonstrates communication between two destinations using the Packet interface.
##########################################################
# This RNS example demonstrates a simple client/server #
# echo utility. A client can send an echo request to the #
# server, and the server will respond by proving receipt #
# of the packet. #
##########################################################
import argparse
import sys
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
##########################################################
#### Server Part #########################################
##########################################################
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath):
global reticulum
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our echo server
server_identity = RNS.Identity()
# We create a destination that clients can query. We want
# to be able to verify echo replies to our clients, so we
# create a "single" destination that can receive encrypted
# messages. This way the client can send a request and be
# certain that no-one else than this destination was able
# to read it.
echo_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"echo",
"request"
)
# We configure the destination to automatically prove all
# packets addressed to it. By doing this, RNS will automatically
# generate a proof for each incoming packet and transmit it
# back to the sender of that packet.
echo_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
# Tell the destination which function in our program to
# run when a packet is received. We do this so we can
# print a log message when the server receives a request
echo_destination.set_packet_callback(server_callback)
# Everything's ready!
# Let's Wait for client requests or user input
announceLoop(echo_destination)
def announceLoop(destination):
# Let the user know that everything is ready
RNS.log(
"Echo server "+
RNS.prettyhexrep(destination.hash)+
" running, hit enter to manually send an announce (Ctrl-C to quit)"
)
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
def server_callback(message, packet):
global reticulum
# Tell the user that we received an echo request, and
# that we are going to send a reply to the requester.
# Sending the proof is handled automatically, since we
# set up the destination to prove all incoming packets.
reception_stats = ""
if reticulum.is_connected_to_shared_instance:
reception_rssi = reticulum.get_packet_rssi(packet.packet_hash)
reception_snr = reticulum.get_packet_snr(packet.packet_hash)
if reception_rssi != None:
reception_stats += " [RSSI "+str(reception_rssi)+" dBm]"
if reception_snr != None:
reception_stats += " [SNR "+str(reception_snr)+" dBm]"
else:
if packet.rssi != None:
reception_stats += " [RSSI "+str(packet.rssi)+" dBm]"
if packet.snr != None:
reception_stats += " [SNR "+str(packet.snr)+" dB]"
RNS.log("Received packet from echo client, proof sent"+reception_stats)
##########################################################
#### Client Part #########################################
##########################################################
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath, timeout=None):
global reticulum
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except Exception as e:
RNS.log("Invalid destination entered. Check your input!")
RNS.log(str(e)+"\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# We override the loglevel to provide feedback when
# an announce is received
if RNS.loglevel < RNS.LOG_INFO:
RNS.loglevel = RNS.LOG_INFO
# Tell the user that the client is ready!
RNS.log(
"Echo client ready, hit enter to send echo request to "+
destination_hexhash+
" (Ctrl-C to quit)"
)
# We enter a loop that runs until the user exits.
# If the user hits enter, we will try to send an
# echo request to the destination specified on the
# command line.
while True:
input()
# Let's first check if RNS knows a path to the destination.
# If it does, we'll load the server identity and create a packet
if RNS.Transport.has_path(destination_hash):
# To address the server, we need to know it's public
# key, so we check if Reticulum knows this destination.
# This is done by calling the "recall" method of the
# Identity module. If the destination is known, it will
# return an Identity instance that can be used in
# outgoing destinations.
server_identity = RNS.Identity.recall(destination_hash)
# We got the correct identity instance from the
# recall method, so let's create an outgoing
# destination. We use the naming convention:
# example_utilities.echo.request
# This matches the naming we specified in the
# server part of the code.
request_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"echo",
"request"
)
# The destination is ready, so let's create a packet.
# We set the destination to the request_destination
# that was just created, and the only data we add
# is a random hash.
echo_request = RNS.Packet(request_destination, RNS.Identity.get_random_hash())
# Send the packet! If the packet is successfully
# sent, it will return a PacketReceipt instance.
packet_receipt = echo_request.send()
# If the user specified a timeout, we set this
# timeout on the packet receipt, and configure
# a callback function, that will get called if
# the packet times out.
if timeout != None:
packet_receipt.set_timeout(timeout)
packet_receipt.set_timeout_callback(packet_timed_out)
# We can then set a delivery callback on the receipt.
# This will get automatically called when a proof for
# this specific packet is received from the destination.
packet_receipt.set_delivery_callback(packet_delivered)
# Tell the user that the echo request was sent
RNS.log("Sent echo request to "+RNS.prettyhexrep(request_destination.hash))
else:
# If we do not know this destination, tell the
# user to wait for an announce to arrive.
RNS.log("Destination is not yet known. Requesting path...")
RNS.log("Hit enter to manually retry once an announce is received.")
RNS.Transport.request_path(destination_hash)
# This function is called when our reply destination
# receives a proof packet.
def packet_delivered(receipt):
global reticulum
if receipt.status == RNS.PacketReceipt.DELIVERED:
rtt = receipt.get_rtt()
if (rtt >= 1):
rtt = round(rtt, 3)
rttstring = str(rtt)+" seconds"
else:
rtt = round(rtt*1000, 3)
rttstring = str(rtt)+" milliseconds"
reception_stats = ""
if reticulum.is_connected_to_shared_instance:
reception_rssi = reticulum.get_packet_rssi(receipt.proof_packet.packet_hash)
reception_snr = reticulum.get_packet_snr(receipt.proof_packet.packet_hash)
if reception_rssi != None:
reception_stats += " [RSSI "+str(reception_rssi)+" dBm]"
if reception_snr != None:
reception_stats += " [SNR "+str(reception_snr)+" dB]"
else:
if receipt.proof_packet != None:
if receipt.proof_packet.rssi != None:
reception_stats += " [RSSI "+str(receipt.proof_packet.rssi)+" dBm]"
if receipt.proof_packet.snr != None:
reception_stats += " [SNR "+str(receipt.proof_packet.snr)+" dB]"
RNS.log(
"Valid reply received from "+
RNS.prettyhexrep(receipt.destination.hash)+
", round-trip time is "+rttstring+
reception_stats
)
# This function is called if a packet times out.
def packet_timed_out(receipt):
if receipt.status == RNS.PacketReceipt.FAILED:
RNS.log("Packet "+RNS.prettyhexrep(receipt.hash)+" timed out")
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program gets run at startup,
# and parses input from the user, and then starts
# the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(description="Simple echo server and client utility")
parser.add_argument(
"-s",
"--server",
action="store_true",
help="wait for incoming packets from clients"
)
parser.add_argument(
"-t",
"--timeout",
action="store",
metavar="s",
default=None,
help="set a reply timeout in seconds",
type=float
)
parser.add_argument("--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.server:
configarg=None
if args.config:
configarg = args.config
server(configarg)
else:
if args.config:
configarg = args.config
else:
configarg = None
if args.timeout:
timeoutarg = float(args.timeout)
else:
timeoutarg = None
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg, timeout=timeoutarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Echo.py.
Link¶
The Link example explores establishing an encrypted link to a remote destination, and passing traffic back and forth over the link.
##########################################################
# This RNS example demonstrates how to set up a link to #
# a destination, and pass data back and forth over it. #
##########################################################
import os
import sys
import time
import argparse
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
##########################################################
#### Server Part #########################################
##########################################################
# A reference to the latest client link that connected
latest_client_link = None
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our link example
server_identity = RNS.Identity()
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"linkexample"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# Everything's ready!
# Let's Wait for client requests or user input
server_loop(server_destination)
def server_loop(destination):
# Let the user know that everything is ready
RNS.log(
"Link example "+
RNS.prettyhexrep(destination.hash)+
" running, waiting for a connection."
)
RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link.
def client_connected(link):
global latest_client_link
RNS.log("Client connected")
link.set_link_closed_callback(client_disconnected)
link.set_packet_callback(server_packet_received)
latest_client_link = link
def client_disconnected(link):
RNS.log("Client disconnected")
def server_packet_received(message, packet):
global latest_client_link
# When data is received over any active link,
# it will all be directed to the last client
# that connected.
text = message.decode("utf-8")
RNS.log("Received data on the link: "+text)
reply_text = "I received \""+text+"\" over the link"
reply_data = reply_text.encode("utf-8")
RNS.Packet(latest_client_link, reply_data).send()
##########################################################
#### Client Part #########################################
##########################################################
# A reference to the server link
server_link = None
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"linkexample"
)
# And create a link
link = RNS.Link(server_destination)
# We set a callback that will get executed
# every time a packet is received over the
# link
link.set_packet_callback(client_packet_received)
# We'll also set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# Everything is set up, so let's enter a loop
# for the user to interact with the example
client_loop()
def client_loop():
global server_link
# Wait for the link to become active
while not server_link:
time.sleep(0.1)
should_quit = False
while not should_quit:
try:
print("> ", end=" ")
text = input()
# Check if we should quit the example
if text == "quit" or text == "q" or text == "exit":
should_quit = True
server_link.teardown()
# If not, send the entered text over the link
if text != "":
data = text.encode("utf-8")
if len(data) <= RNS.Link.MDU:
RNS.Packet(server_link, data).send()
else:
RNS.log(
"Cannot send this packet, the data size of "+
str(len(data))+" bytes exceeds the link packet MDU of "+
str(RNS.Link.MDU)+" bytes",
RNS.LOG_ERROR
)
except Exception as e:
RNS.log("Error while sending data over the link: "+str(e))
should_quit = True
server_link.teardown()
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link
server_link = link
# Inform the user that the server is
# connected
RNS.log("Link established with server, enter some text to send, or \"quit\" to quit")
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
time.sleep(1.5)
sys.exit(0)
# When a packet is received over the link, we
# simply print out the data.
def client_packet_received(message, packet):
text = message.decode("utf-8")
RNS.log("Received data on the link: "+text)
print("> ", end=" ")
sys.stdout.flush()
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(description="Simple link example")
parser.add_argument(
"-s",
"--server",
action="store_true",
help="wait for incoming link requests from clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.server:
server(configarg)
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Link.py.
Identification¶
The Identify example explores identifying an intiator of a link, once the link has been established.
##########################################################
# This RNS example demonstrates how to set up a link to #
# a destination, and identify the initiator to it's peer #
##########################################################
import os
import sys
import time
import argparse
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
##########################################################
#### Server Part #########################################
##########################################################
# A reference to the latest client link that connected
latest_client_link = None
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our link example
server_identity = RNS.Identity()
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"identifyexample"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# Everything's ready!
# Let's Wait for client requests or user input
server_loop(server_destination)
def server_loop(destination):
# Let the user know that everything is ready
RNS.log(
"Link identification example "+
RNS.prettyhexrep(destination.hash)+
" running, waiting for a connection."
)
RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link.
def client_connected(link):
global latest_client_link
RNS.log("Client connected")
link.set_link_closed_callback(client_disconnected)
link.set_packet_callback(server_packet_received)
link.set_remote_identified_callback(remote_identified)
latest_client_link = link
def client_disconnected(link):
RNS.log("Client disconnected")
def remote_identified(link, identity):
RNS.log("Remote identified as: "+str(identity))
def server_packet_received(message, packet):
global latest_client_link
# Get the originating identity for display
remote_peer = "unidentified peer"
if packet.link.get_remote_identity() != None:
remote_peer = str(packet.link.get_remote_identity())
# When data is received over any active link,
# it will all be directed to the last client
# that connected.
text = message.decode("utf-8")
RNS.log("Received data from "+remote_peer+": "+text)
reply_text = "I received \""+text+"\" over the link from "+remote_peer
reply_data = reply_text.encode("utf-8")
RNS.Packet(latest_client_link, reply_data).send()
##########################################################
#### Client Part #########################################
##########################################################
# A reference to the server link
server_link = None
# A reference to the client identity
client_identity = None
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
global client_identity
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Create a new client identity
client_identity = RNS.Identity()
RNS.log(
"Client created new identity "+
str(client_identity)
)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"identifyexample"
)
# And create a link
link = RNS.Link(server_destination)
# We set a callback that will get executed
# every time a packet is received over the
# link
link.set_packet_callback(client_packet_received)
# We'll also set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# Everything is set up, so let's enter a loop
# for the user to interact with the example
client_loop()
def client_loop():
global server_link
# Wait for the link to become active
while not server_link:
time.sleep(0.1)
should_quit = False
while not should_quit:
try:
print("> ", end=" ")
text = input()
# Check if we should quit the example
if text == "quit" or text == "q" or text == "exit":
should_quit = True
server_link.teardown()
# If not, send the entered text over the link
if text != "":
data = text.encode("utf-8")
if len(data) <= RNS.Link.MDU:
RNS.Packet(server_link, data).send()
else:
RNS.log(
"Cannot send this packet, the data size of "+
str(len(data))+" bytes exceeds the link packet MDU of "+
str(RNS.Link.MDU)+" bytes",
RNS.LOG_ERROR
)
except Exception as e:
RNS.log("Error while sending data over the link: "+str(e))
should_quit = True
server_link.teardown()
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link, client_identity
server_link = link
# Inform the user that the server is
# connected
RNS.log("Link established with server, identifying to remote peer...")
link.identify(client_identity)
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
time.sleep(1.5)
sys.exit(0)
# When a packet is received over the link, we
# simply print out the data.
def client_packet_received(message, packet):
text = message.decode("utf-8")
RNS.log("Received data on the link: "+text)
print("> ", end=" ")
sys.stdout.flush()
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(description="Simple link example")
parser.add_argument(
"-s",
"--server",
action="store_true",
help="wait for incoming link requests from clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.server:
server(configarg)
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Identify.py.
Requests & Responses¶
The Request example explores sending requests and receiving responses.
##########################################################
# This RNS example demonstrates how to perform requests #
# and receive responses over a link. #
##########################################################
import os
import sys
import time
import random
import argparse
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
##########################################################
#### Server Part #########################################
##########################################################
# A reference to the latest client link that connected
latest_client_link = None
def random_text_generator(path, data, request_id, link_id, remote_identity, requested_at):
RNS.log("Generating response to request "+RNS.prettyhexrep(request_id)+" on link "+RNS.prettyhexrep(link_id))
texts = ["They looked up", "On each full moon", "Becky was upset", "I’ll stay away from it", "The pet shop stocks everything"]
return texts[random.randint(0, len(texts)-1)]
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our link example
server_identity = RNS.Identity()
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"requestexample"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# We register a request handler for handling incoming
# requests over any established links.
server_destination.register_request_handler(
"/random/text",
response_generator = random_text_generator,
allow = RNS.Destination.ALLOW_ALL
)
# Everything's ready!
# Let's Wait for client requests or user input
server_loop(server_destination)
def server_loop(destination):
# Let the user know that everything is ready
RNS.log(
"Request example "+
RNS.prettyhexrep(destination.hash)+
" running, waiting for a connection."
)
RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link.
def client_connected(link):
global latest_client_link
RNS.log("Client connected")
link.set_link_closed_callback(client_disconnected)
latest_client_link = link
def client_disconnected(link):
RNS.log("Client disconnected")
##########################################################
#### Client Part #########################################
##########################################################
# A reference to the server link
server_link = None
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"requestexample"
)
# And create a link
link = RNS.Link(server_destination)
# We'll set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# Everything is set up, so let's enter a loop
# for the user to interact with the example
client_loop()
def client_loop():
global server_link
# Wait for the link to become active
while not server_link:
time.sleep(0.1)
should_quit = False
while not should_quit:
try:
print("> ", end=" ")
text = input()
# Check if we should quit the example
if text == "quit" or text == "q" or text == "exit":
should_quit = True
server_link.teardown()
else:
server_link.request(
"/random/text",
data = None,
response_callback = got_response,
failed_callback = request_failed
)
except Exception as e:
RNS.log("Error while sending request over the link: "+str(e))
should_quit = True
server_link.teardown()
def got_response(request_receipt):
request_id = request_receipt.request_id
response = request_receipt.response
RNS.log("Got response for request "+RNS.prettyhexrep(request_id)+": "+str(response))
def request_received(request_receipt):
RNS.log("The request "+RNS.prettyhexrep(request_receipt.request_id)+" was received by the remote peer.")
def request_failed(request_receipt):
RNS.log("The request "+RNS.prettyhexrep(request_receipt.request_id)+" failed.")
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link
server_link = link
# Inform the user that the server is
# connected
RNS.log("Link established with server, hit enter to perform a request, or type in \"quit\" to quit")
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
time.sleep(1.5)
sys.exit(0)
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(description="Simple request/response example")
parser.add_argument(
"-s",
"--server",
action="store_true",
help="wait for incoming requests from clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.server:
server(configarg)
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Request.py.
Channel¶
The Channel example explores using a Channel to send structured
data between peers of a Link.
##########################################################
# This RNS example demonstrates how to set up a link to #
# a destination, and pass structured messages over it #
# using a channel. #
##########################################################
import os
import sys
import time
import argparse
from datetime import datetime
import RNS
from RNS.vendor import umsgpack
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
##########################################################
#### Shared Objects ######################################
##########################################################
# Channel data must be structured in a subclass of
# MessageBase. This ensures that the channel will be able
# to serialize and deserialize the object and multiplex it
# with other objects. Both ends of a link will need the
# same object definitions to be able to communicate over
# a channel.
#
# Note: The objects we wish to use over the channel must
# be registered with the channel, and each link has a
# different channel instance. See the client_connected
# and link_established functions in this example to see
# how message types are registered.
# Let's make a simple message class called StringMessage
# that will convey a string with a timestamp.
class StringMessage(RNS.MessageBase):
# The MSGTYPE class variable needs to be assigned a
# 2 byte integer value. This identifier allows the
# channel to look up your message's constructor when a
# message arrives over the channel.
#
# MSGTYPE must be unique across all message types we
# register with the channel. MSGTYPEs >= 0xf000 are
# reserved for the system.
MSGTYPE = 0x0101
# The constructor of our object must be callable with
# no arguments. We can have parameters, but they must
# have a default assignment.
#
# This is needed so the channel can create an empty
# version of our message into which the incoming
# message can be unpacked.
def __init__(self, data=None):
self.data = data
self.timestamp = datetime.now()
# Finally, our message needs to implement functions
# the channel can call to pack and unpack our message
# to/from the raw packet payload. We'll use the
# umsgpack package bundled with RNS. We could also use
# the struct package bundled with Python if we wanted
# more control over the structure of the packed bytes.
#
# Also note that packed message objects must fit
# entirely in one packet. The number of bytes
# available for message payloads can be queried from
# the channel using the Channel.MDU property. The
# channel MDU is slightly less than the link MDU due
# to encoding the message header.
# The pack function encodes the message contents into
# a byte stream.
def pack(self) -> bytes:
return umsgpack.packb((self.data, self.timestamp))
# And the unpack function decodes a byte stream into
# the message contents.
def unpack(self, raw):
self.data, self.timestamp = umsgpack.unpackb(raw)
##########################################################
#### Server Part #########################################
##########################################################
# A reference to the latest client link that connected
latest_client_link = None
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our link example
server_identity = RNS.Identity()
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"channelexample"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# Everything's ready!
# Let's Wait for client requests or user input
server_loop(server_destination)
def server_loop(destination):
# Let the user know that everything is ready
RNS.log(
"Channel example "+
RNS.prettyhexrep(destination.hash)+
" running, waiting for a connection."
)
RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link.
def client_connected(link):
global latest_client_link
latest_client_link = link
RNS.log("Client connected")
link.set_link_closed_callback(client_disconnected)
# Register message types and add callback to channel
channel = link.get_channel()
channel.register_message_type(StringMessage)
channel.add_message_handler(server_message_received)
def client_disconnected(link):
RNS.log("Client disconnected")
def server_message_received(message):
"""
A message handler
@param message: An instance of a subclass of MessageBase
@return: True if message was handled
"""
global latest_client_link
# When a message is received over any active link,
# the replies will all be directed to the last client
# that connected.
# In a message handler, any deserializable message
# that arrives over the link's channel will be passed
# to all message handlers, unless a preceding handler indicates it
# has handled the message.
#
#
if isinstance(message, StringMessage):
RNS.log("Received data on the link: " + message.data + " (message created at " + str(message.timestamp) + ")")
reply_message = StringMessage("I received \""+message.data+"\" over the link")
latest_client_link.get_channel().send(reply_message)
# Incoming messages are sent to each message
# handler added to the channel, in the order they
# were added.
# If any message handler returns True, the message
# is considered handled and any subsequent
# handlers are skipped.
return True
##########################################################
#### Client Part #########################################
##########################################################
# A reference to the server link
server_link = None
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"channelexample"
)
# And create a link
link = RNS.Link(server_destination)
# We'll also set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# Everything is set up, so let's enter a loop
# for the user to interact with the example
client_loop()
def client_loop():
global server_link
# Wait for the link to become active
while not server_link:
time.sleep(0.1)
should_quit = False
while not should_quit:
try:
print("> ", end=" ")
text = input()
# Check if we should quit the example
if text == "quit" or text == "q" or text == "exit":
should_quit = True
server_link.teardown()
# If not, send the entered text over the link
if text != "":
message = StringMessage(text)
packed_size = len(message.pack())
channel = server_link.get_channel()
if channel.is_ready_to_send():
if packed_size <= channel.mdu:
channel.send(message)
else:
RNS.log(
"Cannot send this packet, the data size of "+
str(packed_size)+" bytes exceeds the link packet MDU of "+
str(channel.MDU)+" bytes",
RNS.LOG_ERROR
)
else:
RNS.log("Channel is not ready to send, please wait for " +
"pending messages to complete.", RNS.LOG_ERROR)
except Exception as e:
RNS.log("Error while sending data over the link: "+str(e))
should_quit = True
server_link.teardown()
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link
server_link = link
# Register messages and add handler to channel
channel = link.get_channel()
channel.register_message_type(StringMessage)
channel.add_message_handler(client_message_received)
# Inform the user that the server is
# connected
RNS.log("Link established with server, enter some text to send, or \"quit\" to quit")
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
time.sleep(1.5)
sys.exit(0)
# When a packet is received over the channel, we
# simply print out the data.
def client_message_received(message):
if isinstance(message, StringMessage):
RNS.log("Received data on the link: " + message.data + " (message created at " + str(message.timestamp) + ")")
print("> ", end=" ")
sys.stdout.flush()
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(description="Simple channel example")
parser.add_argument(
"-s",
"--server",
action="store_true",
help="wait for incoming link requests from clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.server:
server(configarg)
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Channel.py.
Buffer¶
The Buffer example explores using buffered readers and writers to send
binary data between peers of a Link.
##########################################################
# This RNS example demonstrates how to set up a link to #
# a destination, and pass binary data over it using a #
# channel buffer. #
##########################################################
from __future__ import annotations
import os
import sys
import time
import argparse
from datetime import datetime
import RNS
from RNS.vendor import umsgpack
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
##########################################################
#### Server Part #########################################
##########################################################
# A reference to the latest client link that connected
latest_client_link = None
# A reference to the latest buffer object
latest_buffer = None
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our example
server_identity = RNS.Identity()
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"bufferexample"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# Everything's ready!
# Let's Wait for client requests or user input
server_loop(server_destination)
def server_loop(destination):
# Let the user know that everything is ready
RNS.log(
"Link buffer example "+
RNS.prettyhexrep(destination.hash)+
" running, waiting for a connection."
)
RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link.
def client_connected(link):
global latest_client_link, latest_buffer
latest_client_link = link
RNS.log("Client connected")
link.set_link_closed_callback(client_disconnected)
# If a new connection is received, the old reader
# needs to be disconnected.
if latest_buffer:
latest_buffer.close()
# Create buffer objects.
# The stream_id parameter to these functions is
# a bit like a file descriptor, except that it
# is unique to the *receiver*.
#
# In this example, both the reader and the writer
# use stream_id = 0, but there are actually two
# separate unidirectional streams flowing in
# opposite directions.
#
channel = link.get_channel()
latest_buffer = RNS.Buffer.create_bidirectional_buffer(0, 0, channel, server_buffer_ready)
def client_disconnected(link):
RNS.log("Client disconnected")
def server_buffer_ready(ready_bytes: int):
"""
Callback from buffer when buffer has data available
:param ready_bytes: The number of bytes ready to read
"""
global latest_buffer
data = latest_buffer.read(ready_bytes)
data = data.decode("utf-8")
RNS.log("Received data over the buffer: " + data)
reply_message = "I received \""+data+"\" over the buffer"
reply_message = reply_message.encode("utf-8")
latest_buffer.write(reply_message)
latest_buffer.flush()
##########################################################
#### Client Part #########################################
##########################################################
# A reference to the server link
server_link = None
# A reference to the buffer object, needed to share the
# object from the link connected callback to the client
# loop.
buffer = None
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"bufferexample"
)
# And create a link
link = RNS.Link(server_destination)
# We'll also set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# Everything is set up, so let's enter a loop
# for the user to interact with the example
client_loop()
def client_loop():
global server_link
# Wait for the link to become active
while not server_link:
time.sleep(0.1)
should_quit = False
while not should_quit:
try:
print("> ", end=" ")
text = input()
# Check if we should quit the example
if text == "quit" or text == "q" or text == "exit":
should_quit = True
server_link.teardown()
else:
# Otherwise, encode the text and write it to the buffer.
text = text.encode("utf-8")
buffer.write(text)
# Flush the buffer to force the data to be sent.
buffer.flush()
except Exception as e:
RNS.log("Error while sending data over the link buffer: "+str(e))
should_quit = True
server_link.teardown()
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link, buffer
server_link = link
# Create buffer, see server_client_connected() for
# more detail about setting up the buffer.
channel = link.get_channel()
buffer = RNS.Buffer.create_bidirectional_buffer(0, 0, channel, client_buffer_ready)
# Inform the user that the server is
# connected
RNS.log("Link established with server, enter some text to send, or \"quit\" to quit")
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
time.sleep(1.5)
sys.exit(0)
# When the buffer has new data, read it and write it to the terminal.
def client_buffer_ready(ready_bytes: int):
global buffer
data = buffer.read(ready_bytes)
RNS.log("Received data over the link buffer: " + data.decode("utf-8"))
print("> ", end=" ")
sys.stdout.flush()
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(description="Simple buffer example")
parser.add_argument(
"-s",
"--server",
action="store_true",
help="wait for incoming link requests from clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.server:
server(configarg)
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Buffer.py.
Filetransfer¶
The Filetransfer example implements a basic file-server program that allow clients to connect and download files. The program uses the Resource interface to efficiently pass files of any size over a Reticulum Link.
##########################################################
# This RNS example demonstrates a simple filetransfer #
# server and client program. The server will serve a #
# directory of files, and the clients can list and #
# download files from the server. #
# #
# Please note that using RNS Resources for large file #
# transfers is not recommended, since compression, #
# encryption and hashmap sequencing can take a long time #
# on systems with slow CPUs, which will probably result #
# in the client timing out before the resource sender #
# can complete preparing the resource. #
# #
# If you need to transfer large files, use the Bundle #
# class instead, which will automatically slice the data #
# into chunks suitable for packing as a Resource. #
##########################################################
import os
import sys
import time
import threading
import argparse
import RNS
import RNS.vendor.umsgpack as umsgpack
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
# We'll also define a default timeout, in seconds
APP_TIMEOUT = 45.0
##########################################################
#### Server Part #########################################
##########################################################
serve_path = None
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath, path):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our file server
server_identity = RNS.Identity()
global serve_path
serve_path = path
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"filetransfer",
"server"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# Everything's ready!
# Let's Wait for client requests or user input
announceLoop(server_destination)
def announceLoop(destination):
# Let the user know that everything is ready
RNS.log("File server "+RNS.prettyhexrep(destination.hash)+" running")
RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
destination.announce()
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
# Here's a convenience function for listing all files
# in our served directory
def list_files():
# We add all entries from the directory that are
# actual files, and does not start with "."
global serve_path
return [file for file in os.listdir(serve_path) if os.path.isfile(os.path.join(serve_path, file)) and file[:1] != "."]
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link. We then send the client
# a list of files hosted on the server.
def client_connected(link):
# Check if the served directory still exists
if os.path.isdir(serve_path):
RNS.log("Client connected, sending file list...")
link.set_link_closed_callback(client_disconnected)
# We pack a list of files for sending in a packet
data = umsgpack.packb(list_files())
# Check the size of the packed data
if len(data) <= RNS.Link.MDU:
# If it fits in one packet, we will just
# send it as a single packet over the link.
list_packet = RNS.Packet(link, data)
list_receipt = list_packet.send()
list_receipt.set_timeout(APP_TIMEOUT)
list_receipt.set_delivery_callback(list_delivered)
list_receipt.set_timeout_callback(list_timeout)
else:
RNS.log("Too many files in served directory!", RNS.LOG_ERROR)
RNS.log("You should implement a function to split the filelist over multiple packets.", RNS.LOG_ERROR)
RNS.log("Hint: The client already supports it :)", RNS.LOG_ERROR)
# After this, we're just going to keep the link
# open until the client requests a file. We'll
# configure a function that get's called when
# the client sends a packet with a file request.
link.set_packet_callback(client_request)
else:
RNS.log("Client connected, but served path no longer exists!", RNS.LOG_ERROR)
link.teardown()
def client_disconnected(link):
RNS.log("Client disconnected")
def client_request(message, packet):
global serve_path
try:
filename = message.decode("utf-8")
except Exception as e:
filename = None
if filename in list_files():
try:
# If we have the requested file, we'll
# read it and pack it as a resource
RNS.log("Client requested \""+filename+"\"")
file = open(os.path.join(serve_path, filename), "rb")
file_resource = RNS.Resource(
file,
packet.link,
callback=resource_sending_concluded
)
file_resource.filename = filename
except Exception as e:
# If somethign went wrong, we close
# the link
RNS.log("Error while reading file \""+filename+"\"", RNS.LOG_ERROR)
packet.link.teardown()
raise e
else:
# If we don't have it, we close the link
RNS.log("Client requested an unknown file")
packet.link.teardown()
# This function is called on the server when a
# resource transfer concludes.
def resource_sending_concluded(resource):
if hasattr(resource, "filename"):
name = resource.filename
else:
name = "resource"
if resource.status == RNS.Resource.COMPLETE:
RNS.log("Done sending \""+name+"\" to client")
elif resource.status == RNS.Resource.FAILED:
RNS.log("Sending \""+name+"\" to client failed")
def list_delivered(receipt):
RNS.log("The file list was received by the client")
def list_timeout(receipt):
RNS.log("Sending list to client timed out, closing this link")
link = receipt.destination
link.teardown()
##########################################################
#### Client Part #########################################
##########################################################
# We store a global list of files available on the server
server_files = []
# A reference to the server link
server_link = None
# And a reference to the current download
current_download = None
current_filename = None
# Variables to store download statistics
download_started = 0
download_finished = 0
download_time = 0
transfer_size = 0
file_size = 0
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
sys.exit(0)
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"filetransfer",
"server"
)
# We also want to automatically prove incoming packets
server_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
# And create a link
link = RNS.Link(server_destination)
# We expect any normal data packets on the link
# to contain a list of served files, so we set
# a callback accordingly
link.set_packet_callback(filelist_received)
# We'll also set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# And set the link to automatically begin
# downloading advertised resources
link.set_resource_strategy(RNS.Link.ACCEPT_ALL)
link.set_resource_started_callback(download_began)
link.set_resource_concluded_callback(download_concluded)
menu()
# Requests the specified file from the server
def download(filename):
global server_link, menu_mode, current_filename, transfer_size, download_started
current_filename = filename
download_started = 0
transfer_size = 0
# We just create a packet containing the
# requested filename, and send it down the
# link. We also specify we don't need a
# packet receipt.
request_packet = RNS.Packet(server_link, filename.encode("utf-8"), create_receipt=False)
request_packet.send()
print("")
print(("Requested \""+filename+"\" from server, waiting for download to begin..."))
menu_mode = "download_started"
# This function runs a simple menu for the user
# to select which files to download, or quit
menu_mode = None
def menu():
global server_files, server_link
# Wait until we have a filelist
while len(server_files) == 0:
time.sleep(0.1)
RNS.log("Ready!")
time.sleep(0.5)
global menu_mode
menu_mode = "main"
should_quit = False
while (not should_quit):
print_menu()
while not menu_mode == "main":
# Wait
time.sleep(0.25)
user_input = input()
if user_input == "q" or user_input == "quit" or user_input == "exit":
should_quit = True
print("")
else:
if user_input in server_files:
download(user_input)
else:
try:
if 0 <= int(user_input) < len(server_files):
download(server_files[int(user_input)])
except:
pass
if should_quit:
server_link.teardown()
# Prints out menus or screens for the
# various states of the client program.
# It's simple and quite uninteresting.
# I won't go into detail here. Just
# strings basically.
def print_menu():
global menu_mode, download_time, download_started, download_finished, transfer_size, file_size
if menu_mode == "main":
clear_screen()
print_filelist()
print("")
print("Select a file to download by entering name or number, or q to quit")
print(("> "), end=' ')
elif menu_mode == "download_started":
download_began = time.time()
while menu_mode == "download_started":
time.sleep(0.1)
if time.time() > download_began+APP_TIMEOUT:
print("The download timed out")
time.sleep(1)
server_link.teardown()
if menu_mode == "downloading":
print("Download started")
print("")
while menu_mode == "downloading":
global current_download
percent = round(current_download.get_progress() * 100.0, 1)
print(("\rProgress: "+str(percent)+" % "), end=' ')
sys.stdout.flush()
time.sleep(0.1)
if menu_mode == "save_error":
print(("\rProgress: 100.0 %"), end=' ')
sys.stdout.flush()
print("")
print("Could not write downloaded file to disk")
current_download.status = RNS.Resource.FAILED
menu_mode = "download_concluded"
if menu_mode == "download_concluded":
if current_download.status == RNS.Resource.COMPLETE:
print(("\rProgress: 100.0 %"), end=' ')
sys.stdout.flush()
# Print statistics
hours, rem = divmod(download_time, 3600)
minutes, seconds = divmod(rem, 60)
timestring = "{:0>2}:{:0>2}:{:05.2f}".format(int(hours),int(minutes),seconds)
print("")
print("")
print("--- Statistics -----")
print("\tTime taken : "+timestring)
print("\tFile size : "+size_str(file_size))
print("\tData transferred : "+size_str(transfer_size))
print("\tEffective rate : "+size_str(file_size/download_time, suffix='b')+"/s")
print("\tTransfer rate : "+size_str(transfer_size/download_time, suffix='b')+"/s")
print("")
print("The download completed! Press enter to return to the menu.")
print("")
input()
else:
print("")
print("The download failed! Press enter to return to the menu.")
input()
current_download = None
menu_mode = "main"
print_menu()
# This function prints out a list of files
# on the connected server.
def print_filelist():
global server_files
print("Files on server:")
for index,file in enumerate(server_files):
print("\t("+str(index)+")\t"+file)
def filelist_received(filelist_data, packet):
global server_files, menu_mode
try:
# Unpack the list and extend our
# local list of available files
filelist = umsgpack.unpackb(filelist_data)
for file in filelist:
if not file in server_files:
server_files.append(file)
# If the menu is already visible,
# we'll update it with what was
# just received
if menu_mode == "main":
print_menu()
except:
RNS.log("Invalid file list data received, closing link")
packet.link.teardown()
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link
server_link = link
# Inform the user that the server is
# connected
RNS.log("Link established with server")
RNS.log("Waiting for filelist...")
# And set up a small job to check for
# a potential timeout in receiving the
# file list
thread = threading.Thread(target=filelist_timeout_job, daemon=True)
thread.start()
# This job just sleeps for the specified
# time, and then checks if the file list
# was received. If not, the program will
# exit.
def filelist_timeout_job():
time.sleep(APP_TIMEOUT)
global server_files
if len(server_files) == 0:
RNS.log("Timed out waiting for filelist, exiting")
sys.exit(0)
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
time.sleep(1.5)
sys.exit(0)
# When RNS detects that the download has
# started, we'll update our menu state
# so the user can be shown a progress of
# the download.
def download_began(resource):
global menu_mode, current_download, download_started, transfer_size, file_size
current_download = resource
if download_started == 0:
download_started = time.time()
transfer_size += resource.size
file_size = resource.total_size
menu_mode = "downloading"
# When the download concludes, successfully
# or not, we'll update our menu state and
# inform the user about how it all went.
def download_concluded(resource):
global menu_mode, current_filename, download_started, download_finished, download_time
download_finished = time.time()
download_time = download_finished - download_started
saved_filename = current_filename
if resource.status == RNS.Resource.COMPLETE:
counter = 0
while os.path.isfile(saved_filename):
counter += 1
saved_filename = current_filename+"."+str(counter)
try:
file = open(saved_filename, "wb")
file.write(resource.data.read())
file.close()
menu_mode = "download_concluded"
except:
menu_mode = "save_error"
else:
menu_mode = "download_concluded"
# A convenience function for printing a human-
# readable file size
def size_str(num, suffix='B'):
units = ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']
last_unit = 'Yi'
if suffix == 'b':
num *= 8
units = ['','K','M','G','T','P','E','Z']
last_unit = 'Y'
for unit in units:
if abs(num) < 1024.0:
return "%3.2f %s%s" % (num, unit, suffix)
num /= 1024.0
return "%.2f %s%s" % (num, last_unit, suffix)
# A convenience function for clearing the screen
def clear_screen():
os.system('cls' if os.name=='nt' else 'clear')
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(
description="Simple file transfer server and client utility"
)
parser.add_argument(
"-s",
"--serve",
action="store",
metavar="dir",
help="serve a directory of files to clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.serve:
if os.path.isdir(args.serve):
server(configarg, args.serve)
else:
RNS.log("The specified directory does not exist")
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
sys.exit(0)
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/Filetransfer.py.
Custom Interfaces¶
The ExampleInterface demonstrates creating custom interfaces for Reticulum. Any number of custom interfaces can be loaded and utilised by Reticulum, and will be fully on-par with natively included interfaces, including all supported interface modes and common configuration options.
# This example illustrates creating a custom interface
# definition, that can be loaded and used by Reticulum at
# runtime. Any number of custom interfaces can be created
# and loaded. To use the interface place it in the folder
# ~/.reticulum/interfaces, and add an interface entry to
# your Reticulum configuration file similar to this:
# [[Example Custom Interface]]
# type = ExampleInterface
# enabled = no
# mode = gateway
# port = /dev/ttyUSB0
# speed = 115200
# databits = 8
# parity = none
# stopbits = 1
from time import sleep
import sys
import threading
import time
# This HDLC helper class is used by the interface
# to delimit and packetize data over the physical
# medium - in this case a serial connection.
class HDLC():
# This example interface packetizes data using
# simplified HDLC framing, similar to PPP
FLAG = 0x7E
ESC = 0x7D
ESC_MASK = 0x20
@staticmethod
def escape(data):
data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK]))
data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK]))
return data
# Let's define our custom interface class. It must
# be a sub-class of the RNS "Interface" class.
class ExampleInterface(Interface):
# All interface classes must define a default
# IFAC size, used in IFAC setup when the user
# has not specified a custom IFAC size. This
# option is specified in bytes.
DEFAULT_IFAC_SIZE = 8
# The following properties are local to this
# particular interface implementation.
owner = None
port = None
speed = None
databits = None
parity = None
stopbits = None
serial = None
# All Reticulum interfaces must have an __init__
# method that takes 2 positional arguments:
# The owner RNS Transport instance, and a dict
# of configuration values.
def __init__(self, owner, configuration):
# The following lines demonstrate handling
# potential dependencies required for the
# interface to function correctly.
import importlib
if importlib.util.find_spec('serial') != None:
import serial
else:
RNS.log("Using this interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
RNS.panic()
# We start out by initialising the super-class
super().__init__()
# To make sure the configuration data is in the
# correct format, we parse it through the following
# method on the generic Interface class. This step
# is required to ensure compatibility on all the
# platforms that Reticulum supports.
ifconf = Interface.get_config_obj(configuration)
# Read the interface name from the configuration
# and set it on our interface instance.
name = ifconf["name"]
self.name = name
# We read configuration parameters from the supplied
# configuration data, and provide default values in
# case any are missing.
port = ifconf["port"] if "port" in ifconf else None
speed = int(ifconf["speed"]) if "speed" in ifconf else 9600
databits = int(ifconf["databits"]) if "databits" in ifconf else 8
parity = ifconf["parity"] if "parity" in ifconf else "N"
stopbits = int(ifconf["stopbits"]) if "stopbits" in ifconf else 1
# In case no port is specified, we abort setup by
# raising an exception.
if port == None:
raise ValueError(f"No port specified for {self}")
# All interfaces must supply a hardware MTU value
# to the RNS Transport instance. This value should
# be the maximum data packet payload size that the
# underlying medium is capable of handling in all
# cases without any segmentation.
self.HW_MTU = 564
# We initially set the "online" property to false,
# since the interface has not actually been fully
# initialised and connected yet.
self.online = False
# In this case, we can also set the indicated bit-
# rate of the interface to the serial port speed.
self.bitrate = speed
# Configure internal properties on the interface
# according to the supplied configuration.
self.pyserial = serial
self.serial = None
self.owner = owner
self.port = port
self.speed = speed
self.databits = databits
self.parity = serial.PARITY_NONE
self.stopbits = stopbits
self.timeout = 100
if parity.lower() == "e" or parity.lower() == "even":
self.parity = serial.PARITY_EVEN
if parity.lower() == "o" or parity.lower() == "odd":
self.parity = serial.PARITY_ODD
# Since all required parameters are now configured,
# we will try opening the serial port.
try:
self.open_port()
except Exception as e:
RNS.log("Could not open serial port for interface "+str(self), RNS.LOG_ERROR)
raise e
# If opening the port succeeded, run any post-open
# configuration required.
if self.serial.is_open:
self.configure_device()
else:
raise IOError("Could not open serial port")
# Open the serial port with supplied configuration
# parameters and store a reference to the open port.
def open_port(self):
RNS.log("Opening serial port "+self.port+"...", RNS.LOG_VERBOSE)
self.serial = self.pyserial.Serial(
port = self.port,
baudrate = self.speed,
bytesize = self.databits,
parity = self.parity,
stopbits = self.stopbits,
xonxoff = False,
rtscts = False,
timeout = 0,
inter_byte_timeout = None,
write_timeout = None,
dsrdtr = False,
)
# The only thing required after opening the port
# is to wait a small amount of time for the
# hardware to initialise and then start a thread
# that reads any incoming data from the device.
def configure_device(self):
sleep(0.5)
thread = threading.Thread(target=self.read_loop)
thread.daemon = True
thread.start()
self.online = True
RNS.log("Serial port "+self.port+" is now open", RNS.LOG_VERBOSE)
# This method will be called from our read-loop
# whenever a full packet has been received over
# the underlying medium.
def process_incoming(self, data):
# Update our received bytes counter
self.rxb += len(data)
# And send the data packet to the Transport
# instance for processing.
self.owner.inbound(data, self)
# The running Reticulum Transport instance will
# call this method on the interface whenever the
# interface must transmit a packet.
def process_outgoing(self,data):
if self.online:
# First, escape and packetize the data
# according to HDLC framing.
data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG])
# Then write the framed data to the port
written = self.serial.write(data)
# Update the transmitted bytes counter
# and ensure that all data was written
self.txb += len(data)
if written != len(data):
raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data)))
# This read loop runs in a thread and continously
# receives bytes from the underlying serial port.
# When a full packet has been received, it will
# be sent to the process_incoming methed, which
# will in turn pass it to the Transport instance.
def read_loop(self):
try:
in_frame = False
escape = False
data_buffer = b""
last_read_ms = int(time.time()*1000)
while self.serial.is_open:
if self.serial.in_waiting:
byte = ord(self.serial.read(1))
last_read_ms = int(time.time()*1000)
if (in_frame and byte == HDLC.FLAG):
in_frame = False
self.process_incoming(data_buffer)
elif (byte == HDLC.FLAG):
in_frame = True
data_buffer = b""
elif (in_frame and len(data_buffer) < self.HW_MTU):
if (byte == HDLC.ESC):
escape = True
else:
if (escape):
if (byte == HDLC.FLAG ^ HDLC.ESC_MASK):
byte = HDLC.FLAG
if (byte == HDLC.ESC ^ HDLC.ESC_MASK):
byte = HDLC.ESC
escape = False
data_buffer = data_buffer+bytes([byte])
else:
time_since_last = int(time.time()*1000) - last_read_ms
if len(data_buffer) > 0 and time_since_last > self.timeout:
data_buffer = b""
in_frame = False
escape = False
sleep(0.08)
except Exception as e:
self.online = False
RNS.log("A serial port error occurred, the contained exception was: "+str(e), RNS.LOG_ERROR)
RNS.log("The interface "+str(self)+" experienced an unrecoverable error and is now offline.", RNS.LOG_ERROR)
if RNS.Reticulum.panic_on_interface_error:
RNS.panic()
RNS.log("Reticulum will attempt to reconnect the interface periodically.", RNS.LOG_ERROR)
self.online = False
self.serial.close()
self.reconnect_port()
# This method handles serial port disconnects.
def reconnect_port(self):
while not self.online:
try:
time.sleep(5)
RNS.log("Attempting to reconnect serial port "+str(self.port)+" for "+str(self)+"...", RNS.LOG_VERBOSE)
self.open_port()
if self.serial.is_open:
self.configure_device()
except Exception as e:
RNS.log("Error while reconnecting port, the contained exception was: "+str(e), RNS.LOG_ERROR)
RNS.log("Reconnected serial port for "+str(self))
# Signal to Reticulum that this interface should
# not perform any ingress limiting.
def should_ingress_limit(self):
return False
# We must provide a string representation of this
# interface, that is used whenever the interface
# is printed in logs or external programs.
def __str__(self):
return "ExampleInterface["+self.name+"]"
# Finally, register the defined interface class as the
# target class for Reticulum to use as an interface
interface_class = ExampleInterface
This example can also be found at https://github.com/markqvist/Reticulum/blob/master/Examples/ExampleInterface.py.