test_sending_to_mqtt.py

# APRS_to_MQTT.py
# A simple Python script by G7UHN to publish an MQTT message when
# given text is received by a RTL/BeagleBone APRS receiver
# pip3 install paho-mqtt

import sys
from subprocess import Popen, PIPE
import paho.mqtt.client as mqtt
import datetime

username_pw_set(username="africube",password="AE@m0squtt0")
client = mqtt.Client("RTL-APR-VHF")
client.connect("iot.giga.co.za")
client.loop_start()


# General guidance from
# https://stackoverflow.com/questions/2804543/read-subprocess-stdout-line-by-line
# http://www.steves-internet-guide.com/into-mqtt-python-client/

#proc = Popen('rtl_fm -p 50 -f 144.80M - | direwolf -c sdr.conf -r 24000 -t 0 -D 1 -', stdout=PIPE, shell=True)

#while True:
#    line = proc.stdout.readline()
#    if line != '':
#        # Print each line received by Python to stdout
#        print ("Decoded:", line.rstrip())

        # Look for a given text string...
#        if "MQTT switch on" in line:
            # Send an MQTT message to the APRS topic
client.publish("APRS","Turn the switch on")
#        if "MQTT switch off" in line:
#            # Send an MQTT message to the APRS topic
#            client.publish("APRS","Turn the switch off")
#    else: break