CUL2MQTT/cul_seriallog.py

#!/usr/bin/python3 -u
#
# pip3 install pyyaml paho-mqtt pyserial

import serial
import sys
from time import sleep
import datetime
import paho.mqtt.client as mqtt
import json
#import simplejson as json

serialPort = '/dev/serial/by-id/usb-1a86_USB2.0-Serial-if00-port0'
serialBaud = 38400
serialTimeout = 1
culInitCmd = 'X21\r\n' # CUL init command for normal operation
culInitTimeout = 3

verbosemode = True

#try:
serLine = ""
ser = serial.Serial(port=serialPort,baudrate=serialBaud,parity=serial.PARITY_NONE,stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout=serialTimeout)
sleep(culInitTimeout)
ser.write('V\r\n'.encode('utf-8'))  # get CUL version info
serLine = ser.readline()
print(serLine.decode('utf-8').rstrip('\r\n'))
sleep(0.1)
print('Initializing CUL with command: ' + culInitCmd.rstrip('\r\n'))
ser.write(culInitCmd.encode('utf-8'))  # den CUL im normalen Mode initialisieren 

while True:
    serLine = ser.readline()
    if len(serLine) > 0:
        serLine = serLine.decode('utf-8')
        serLine = serLine.rstrip('\r\n')
        
        isValidCommand = False
        
        if serLine[:2] == 'is': # msg is reply from CUL to send command
            isValidCommand = False
            # now do nothing...
        elif serLine[:1] == 'i': # is a IT compatible command
            isValidCommand = True
            inCmd = serLine[:-2] # remove last 2 bytes, as this is only signal strength info
            
        if isValidCommand:
            sys.stdout.write('[')
            sys.stdout.write(str(datetime.datetime.now()).split('.')[0])
            sys.stdout.write(']   ')
            print(inCmd)
        elif verbosemode:
            sys.stdout.write('[')
            sys.stdout.write(str(datetime.datetime.now()).split('.')[0])
            sys.stdout.write(']   ')
            print(serLine)
            
#except KeyboardInterrupt, e:
#    print('\n')