A bridge between MQTT and PE1RXF telemetry nodes.
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#!/usr/bin/python3
import pythonax25
def parsePacket(string):
# Split the address and payload separated by APRS PID
buffer = string.split(b'\x03\xf0')
address = buffer[0]
# Check if the first byte indicates it is a data packet
if address[0] is 0:
# Cut the first byte and feed it to the address parser
listAddress = getAllAddress(address[1:])
# Get the source, destination, and digipeaters from the address list
source = listAddress[1]
destination = listAddress[0]
digipeaters = listAddress[2:]
else:
raise Exception('Not a data packet')
payload = buffer[1]
return (source, destination, digipeaters, payload)
def getAllAddress(packetAddress):
addressSize = 7
# Check if the networked address string is valid
if (len(packetAddress) % 7) is 0:
# Create a list of all address in ASCII form
allAddress = [pythonax25.network_to_ascii(packetAddress[i:i+addressSize])
for i in range(0, len(packetAddress), addressSize)]
return allAddress
else:
raise Exception('Error: Address is not a multiple of 7')
def main():
# Check if there's any active AX25 port
if pythonax25.config_load_ports() > 0:
# Get the device name of the first port
axport = pythonax25.config_get_first_port()
axdevice = pythonax25.config_get_device(axport)
axaddress = pythonax25.config_get_address(axport)
else:
exit(0)
# Initiate a PF_PACKET socket
socket = pythonax25.packet_socket()
while True:
# Blocking receive packet, 10 ms timeout
receive = pythonax25.packet_rx(socket,10)
if receive[0][1] == axdevice:
print(receive)
source, destination, digipeaters, payload = parsePacket(receive[1])
print("Packet Received by = %s"%axaddress)
print("Source Address = %s"%source)
print("Destination Address = %s"%destination)
print("Digipeaters =")
print(digipeaters)
print("Payload = %s"%payload)
print("")
else:
continue
main()