A simple POC forwarder of 7-bit SMS from Asterisk logs to any 3-rd party delivering API. Takes less resources being compared to a usual `tail -f`. Requires python 3.7 due to `smspdudecoder` dependency (TODO: provide a simple inline GSM 7-bit decoding).

asterisk_watchdog.py

#!/usr/bin/env python3.7
# encoding: utf-8
import time
import os
from io import StringIO
from smspdu.fields import SMSDeliver
import requests

asterisk_log = '/var/log/asterisk/messages'


def follow(the_file):
    the_file.seek(0, os.SEEK_END)
    while True:
        line = the_file.readline()
        if not line:
            time.sleep(2)
            continue
        yield line


def decode(pdu_text):
    msg = SMSDeliver.decode(StringIO(pdu_text))
    return msg


def send(msg):
    sender = str(msg['sender']['number'])
    payload = str(msg['user_data']['data'])
    url = 'https://api.pushover.net/1/messages.json'
    data = {'token': '##############', 'user': '##############',
            'sound': 'cashregister', 'title': sender, 'message': payload}
    r = requests.post(url, data=data)
    if r.status_code == 200:
        return r.text
    return r.status_code


logfile = open(asterisk_log)
log_lines = follow(logfile)
for line in log_lines:
    print(line, end='')
    if 'Can\'t parse OA' in line:
        line = str(line.split('\'')[0])
        message = decode(line)
        s = send(message)
        print(s)