goTenna Mesh traffic logger, similar to (and based on) metalogger, but also including cleartext dump when practical

minilogger.py

#!/usr/bin/env python
"""
goTenna mesh message logger, using USB connected gtm-lab receiver
    more info at: https://github.com/sybip/gtm-lab
"""
import serial
import sys
from time import gmtime, strftime
from binascii import unhexlify

# from pyGT https://github.com/sybip/pyGT
from gtairobj import gtReadAirMsg
from compatGTA import gtReadGTABlob
from gtdefs import MSG_CLASS_NAME


try:
    ser = serial.Serial(port=sys.argv[1], baudrate=115200, timeout=1)
except IndexError:
    print("ERROR: Please run as %s PORT_NAME" % sys.argv[0])
    sys.exit()
except serial.serialutil.SerialException:
    print("ERROR: Could not open port: %s" % sys.argv[1])
    sys.exit()


print('Connected to %s, Ctrl-C to quit' % sys.argv[1])

while True:
    try:
        x = ser.readline()
    except KeyboardInterrupt:
        break

    x = x.rstrip()
    if x:
        x = x.decode('utf8')
    else:
        continue

    # Received message lines syntax: RX_MSG:XXXX|DATA_OBJECT_HEX
    if (x[0:7] == 'RX_MSG:'):
        (a, msgObj, ) = x.split('|')
        m = gtReadAirMsg(unhexlify(msgObj), 0)
        if not m:  # could not parse
            print('(parsing error)')
            print(msgObj)
            continue
    else:
        continue  # not a RX message

    try:
        destStr = '%012x:%02x' % (m['destGID'], m['destTag'])
    except KeyError:
        destStr = '[ALL]          '

    try:
        print("%s %s app=%04x %012x->%15s len=%3d h=%04x %s" % (
            strftime('%Y%m%d-%H%M%S', gmtime()),
            MSG_CLASS_NAME[m['classID']],
            m['appID'], m['fromGID'], destStr, len(m['msgBlob']),
            m['hashID'], 'ENC' if m['cryptFlag'] else 'CLR'))
    except (KeyError):
        print('(unknown format)')
        continue

    if (('msgBlob' in m) and not m['cryptFlag']):
        try:
            res = gtReadGTABlob(m['msgBlob'])
        except (ValueError):
            continue

        if res:
            print(res)