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392 lines
15 KiB
392 lines
15 KiB
#!/usr/bin/python3
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"""
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A bridge between APRS messaging and MQTT, designed to control my lora_aprs_node_pico
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(C)2022 M.T. Konstapel https://meezenest.nl/mees
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This file is part of aprs-mqtt-bridge.
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aprs-mqtt-bridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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aprs-mqtt-bridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with aprs-mqtt-bridge. If not, see <https://www.gnu.org/licenses/>.
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"""
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import sys
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import random
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import time
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import os
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from pathlib import Path
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import yaml
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from yaml.loader import SafeLoader
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from paho.mqtt import client as mqtt_client
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import pythonax25
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configuration_file = "aprs-mqtt-bridge.yml"
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# This is where we keep our settings
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class mqtt_settings:
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#broker
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#topic_root
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#port
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#client_id
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#transmit_rate
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#retry
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#topics
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state = 'ready'
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aprs_state = 'idle'
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pass
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mqtt = mqtt_settings()
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axport = []
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axdevice = []
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axaddress = []
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class aprs_status:
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nr_of_ports = 0
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busy = 0
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wait_for_ack = 0
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call_of_wait_for_ack = 0
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time_out_timer = 0
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retry_counter = 0
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selected_port = 0
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request_to_send = 0
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pass
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aprs = aprs_status()
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def parsePacket(string):
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# Split the address and payload separated by APRS PID
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buffer = string.split(b'\x03\xf0')
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address = buffer[0]
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# Check if the first byte indicates it is a data packet
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if address[0] == 0:
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# Cut the first byte and feed it to the address parser
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listAddress = getAllAddress(address[1:])
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if listAddress != 0:
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# Get the source, destination, and digipeaters from the address list
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source = listAddress[1]
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destination = listAddress[0]
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digipeaters = listAddress[2:]
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payload = buffer[1]
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else:
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# If there was an error decoding the address we return save values which will be ignored by the rest of the program
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source = 'NOCALL'
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destination = 'NOCALL'
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digipeaters = 'NOCALL'
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payload = 'NOT VALID'
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else:
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# If there was an error decoding the address we return save values which will be ignored by the rest of the program
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source = 'NOCALL'
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destination = 'NOCALL'
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digipeaters = 'NOCALL'
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payload = 'NOT VALID'
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#raise Exception('Not a data packet')
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return (source, destination, digipeaters, payload)
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def getAllAddress(packetAddress):
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addressSize = 7
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# Check if the networked address string is valid
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if (len(packetAddress) % 7) == 0:
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# Create a list of all address in ASCII form
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try:
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allAddress = [pythonax25.network_to_ascii(packetAddress[i:i+addressSize])
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for i in range(0, len(packetAddress), addressSize)]
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except:
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allAddress = 0
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return allAddress
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else:
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# Received a non valid address. Fill return value with NULL so we don't crash
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allAddress = 0
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return allAddress
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#raise Exception('Error: Address is not a multiple of 7')
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def bind_ax25():
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# Check if there's any active AX25 port
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current_port = 0;
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port_nr = pythonax25.config_load_ports()
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aprs.nr_of_ports = port_nr
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if port_nr > 0:
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# Get the device name of the first port
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axport.append(pythonax25.config_get_first_port())
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axdevice.append(pythonax25.config_get_device(axport[current_port]))
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axaddress.append(pythonax25.config_get_address(axport[current_port]))
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print (axport[current_port], axdevice[current_port], axaddress[current_port])
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current_port = current_port + 1
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while port_nr - current_port > 0:
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axport.append(pythonax25.config_get_next_port(axport[current_port-1]))
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axdevice.append(pythonax25.config_get_device(axport[current_port]))
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axaddress.append(pythonax25.config_get_address(axport[current_port]))
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print (axport[current_port], axdevice[current_port], axaddress[current_port])
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current_port = current_port + 1
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else:
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exit(0)
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# Initiate a PF_PACKET socket (RX)
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rx_socket = pythonax25.packet_socket()
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return rx_socket
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def receive_ax25(rx_socket):
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# Blocking receive packet, 10 ms timeout
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receive = pythonax25.packet_rx(rx_socket,10)
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return receive
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def send_ax25(portCall, srcCall, dest, digi, msg):
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# Initiate a datagram socket (TX)
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tx_socket = pythonax25.datagram_socket()
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res = pythonax25.datagram_bind(tx_socket, srcCall, portCall)
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#print(res)
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if digi == 0:
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res = pythonax25.datagram_tx(tx_socket, dest, msg)
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else:
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res = pythonax25.datagram_tx_digi(tx_socket, dest, digi, msg)
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#print(res)
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pythonax25.close_socket(tx_socket)
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def connect_mqtt():
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def on_connect(client, userdata, flags, rc):
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if rc == 0:
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print("Connected to MQTT Broker!")
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else:
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print("Failed to connect, return code %d\n", rc)
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# Set Connecting Client ID
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client = mqtt_client.Client(mqtt.client_id)
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#client.username_pw_set(username, password)
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client.on_connect = on_connect
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client.connect(mqtt.broker, mqtt.port)
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return client
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def publish(client, topic, message):
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result = client.publish(topic, message)
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status = result[0]
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if status == 0:
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print(f"Send `{message}` to topic `{topic}`")
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else:
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print(f"Failed to send message to topic {topic}")
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def subscribe(client: mqtt_client, topic):
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def on_message(client, userdata, message):
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received_payload = message.payload.decode()
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received_topic = Path(message.topic).name
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print(f"Received `{received_payload}` from `{message.topic}` topic")
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# Find corresponding topic in configuration-file and send this to the next function
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for topics in mqtt.topics:
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if received_topic == topics['name']:
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#print ('Found topic in list!')
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#print (topics)
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process_message(topics, received_payload)
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break
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# print(topic['name'])
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# print(topic['command'])
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client.subscribe(topic)
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client.on_message = on_message
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def read_config():
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try:
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with open(configuration_file) as f:
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cfg = yaml.load(f, Loader=SafeLoader)
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mqtt.topics = cfg['topics']
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#print(mqtt.topics)
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#for topic in mqtt.topics:
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# print(topic['name'])
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# print(topic['command'])
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except:
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print ("Configuration file ./" + configuration_file + " not found.")
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sys.exit(1)
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try:
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mqtt.broker = cfg['global']['broker']
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except:
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print ("Error in configuration file: no broker defined.")
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sys.exit(1)
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try:
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mqtt.port = cfg['global']['port']
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except:
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print ("Error in configuration file: no port defined.")
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sys.exit(1)
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try:
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mqtt.topic_root = cfg['global']['topic_root']
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except:
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print ("Error in configuration file: no topic defined.")
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sys.exit(1)
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try:
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mqtt.transmit_rate = cfg['global']['transmit_rate']
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except:
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print ("Error in configuration file: no transmit_rate defined.")
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sys.exit(1)
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try:
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mqtt.retry = cfg['global']['retry']
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except:
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print ("Error in configuration file: no retry defined.")
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sys.exit(1)
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try:
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mqtt.destination = cfg['global']['destination']
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except:
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print ("Error in configuration file: no retry defined.")
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sys.exit(1)
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mqtt.client_id = f'{mqtt.topic_root}-{random.randint(0, 1000)}'
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print (mqtt.broker)
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print (mqtt.topic_root)
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print (mqtt.port)
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print (mqtt.client_id)
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# Loop through all topics and activate them
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def add_subscribtions_from_configfile(client):
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for topics in mqtt.topics:
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current_topic = mqtt.topic_root + '/' + topics['name']
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subscribe(client,current_topic)
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print('Topic ' + topics['name'] + ' added')
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def process_message(data, payload):
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#print ('Payload: '+ payload)
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#print (data['call'])
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#print (data['port'])
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if aprs.busy == 0:
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# find payload in configuration file
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for commands in data['command']:
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if payload == commands['payload']:
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aprs.time_out_timer = time.time() # Start timeout timer
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aprs.busy = 1
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aprs.selected_port = data['port']
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# Find call of ax25 port
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for position in range(len(axdevice)):
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if axdevice[position] == aprs.selected_port:
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aprs.port_call = axaddress[position]
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aprs.source_call = data['server']
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aprs.wait_for_ack = commands['response']
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aprs.call_of_wait_for_ack = data['call']
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aprs.message = ':' + data['call'].ljust(9) + ':' + commands['cmd']
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arguments = '-d \"APRX29\" -s ' + data['port'] + ' \"' + aprs.message + '\"'
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beacon_program = "/usr/sbin/beacon"
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aprs.beacon_program_with_arguments = beacon_program + " " + arguments
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#os.system(aprs.beacon_program_with_arguments)
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print ('APRS message ' + aprs.message + ' send to ' + aprs.call_of_wait_for_ack + '.')
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mqtt.state = 'busy'
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mqtt.aprs_state = 'sending message'
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aprs.request_to_send = 1;
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else:
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mqtt.state = 'busy'
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def run():
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read_config()
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rx_socket = bind_ax25()
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client = connect_mqtt()
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add_subscribtions_from_configfile(client)
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#topic = mqtt.topic_root + '/set'
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#subscribe(client,topic)
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client.loop_start()
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# Send ready to MQTT broker to indicate we are meaning business
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mqtt.aprs_state = 'ready'
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#topic = mqtt.topic_root + '/aprs_status'
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#publish(client,topic,'ready')
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mqtt.state = 'busy'
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aprs.time_out_timer = time.time()
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while True:
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if aprs.request_to_send == 1:
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send_ax25(aprs.port_call, aprs.source_call, mqtt.destination, 0, aprs.message)
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aprs.time_out_timer = time.time() # Restart timeout timer
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#print(aprs.selected_port)
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#print(aprs.message)
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aprs.request_to_send = 0
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receive = receive_ax25(rx_socket)
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for port in range(len(axdevice)):
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if receive[0][1] == axdevice[port]:
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#print(receive)
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source, destination, digipeaters, payload = parsePacket(receive[1])
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# bug UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf8 in position 47: invalid start byte
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try:
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payload = payload.decode()
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except:
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payload = 'NOT VALID'
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#print("Packet Received by = %s"%axaddress[0])
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#print("Source Address = %s"%source)
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#print("Destination Address = %s"%destination)
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#print("Digipeaters =")
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#print(digipeaters)
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#print("Payload = %s"%payload)
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#print("")
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if aprs.wait_for_ack != 0:
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if source == aprs.call_of_wait_for_ack:
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# split payload at colon. If it is a valid acknowledge, we should get three
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# substrings: the first in empty, the second with the call of the ax25
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# interface and the thirth with the acknowledge
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split_message=payload.split(":")
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if len(split_message) == 3:
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if split_message[1].replace(" ", "") == axaddress[port]:
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if split_message[2] == aprs.wait_for_ack:
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print ('Received acknowledge ' + aprs.wait_for_ack + ' from ' + aprs.call_of_wait_for_ack + ".")
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aprs.time_out_timer = time.time() # Restart timeout timer
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aprs.wait_for_ack = 0
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aprs.busy = 0
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aprs.retry_counter = 0
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mqtt.aprs_state = 'message sent'
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#topic = mqtt.topic_root + '/aprs_status'
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#publish(client,topic,mqtt.aprs_state)
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mqtt.state = 'busy'
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# Time out waiting for acknowledge
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if aprs.wait_for_ack != 0:
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if time.time() - aprs.time_out_timer > mqtt.transmit_rate:
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aprs.retry_counter = aprs.retry_counter + 1
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if aprs.retry_counter < mqtt.retry:
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# Try again
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aprs.time_out_timer = time.time() # Restart timeout timer
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aprs.request_to_send = 1;
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#os.system(aprs.beacon_program_with_arguments)
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print ('Retry: APRS ' + aprs.message + ' message send to ' + aprs.call_of_wait_for_ack + '.')
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mqtt.aprs_state = 'sending message (retry ' + str(aprs.retry_counter) + ')'
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mqtt.state = 'busy'
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else:
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# Give up
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print ('No acknowledge received from ' + aprs.call_of_wait_for_ack + '. Giving up.')
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aprs.time_out_timer = time.time() # Restart timeout timer
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aprs.wait_for_ack = 0
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aprs.busy = 0
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aprs.retry_counter = 0
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mqtt.aprs_state = 'sending message failed'
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#topic = mqtt.topic_root + '/aprs_status'
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#publish(client,topic,mqtt.aprs_state)
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mqtt.state = 'busy'
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# If APRS system is transmitting, retrying and still waiting for acknowledge, keep on waiting and send an MQTT update
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if mqtt.state == 'busy':
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topic = mqtt.topic_root + '/aprs_status'
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publish(client,topic,mqtt.aprs_state)
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mqtt.state = 'ready'
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if __name__ == '__main__':
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#sys.stdout = sys.stderr = open('debug.log', 'w')
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run()
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