Script to receive SMS-es from an AT command operated GSM modem.

README.md

list_sms

A tool to automatically receive SMS-es from SIM card of a AT-command enabled GSM modem running over your UART (or USB, as long as it's reachable as a serial device, it's fair game), write them to a file and then delete them from the SIM card, since the SIM card doesn't have infinite space.

Run it without any modifiers to delete the SMS-es, run it with any modifier, preferably --dont-delete not to delete them from the SIM card.

receive_sms.py

"""
A script to list and delete received SMS-es on an UART attached AT-command GSM modem.

Author: Piotr Maślanka <pmaslanka@smok.co>
Copyright 2020 (c) SMOK sp. z o. o. Some rights reserved.


 DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.
"""

import serial
import time
import re
import sys


SEPARATOR = re.compile(r'\+CMGL\:\s(\d+)\,\"(.*?)\"\,\"(.*?)\",(\,{0,1})\"(.*?)\"\r\n(.*?)\r\n')

if __name__ == '__main__':
        ser = serial.Serial('/dev/ttyUSB0', baudrate=115200, timeout=5)
        ser.write(b'AT+CMGL="ALL"\r')
        data = bytearray()
        while True:
                time.sleep(1)
                readed = ser.read(1024)
                if not readed:
                        break
                else:
                        data += readed
        print(repr(data))
        smses = []

        entries = list(SEPARATOR.findall(data.decode('utf8')))
        print(entries)
        for msg_id, rec_mode, phone_no, who, when, content in entries:
                smses.append('%s %s\n' % (phone_no, content.replace('\r', "\\r").replace('\n', '\\n')))

        if not smses:
                print('No SMS-es detected!')
                sys.exit(0)

        f_out = open('sms.txt', 'a')
        f_out.write(''.join(smses))
        f_out.close()

        print(repr(smses))

        if len(sys.argv) == 1:
                for message_id, rec_mode, phone_no, who, when, content in entries:
                        ser.write(b'AT+CMGD='+message_id.encode('utf8')+b',0\r')
                        started_at = time.monotonic()
                        data = bytearray()
                        while time.monotonic() - started_at < 2:
                                time.sleep(0.2)
                                data = data + ser.read(1024)
                                if b'\r\r\nOK\r\n' in data:
                                        print('Deleted ', message_id, 'with', repr(data))
                                        break
                        else:
                                print('Failure to CMGD')
        else:
                print('Not deleting')