Modem

With this module, you can enqueue commands via serial. It's main scope is to operate a modem (send sms, do a voice call, ...)

Refer to examples for real use cases.

Reality

We are using this module in a RoundRobin configuration with 2 servers with 4 modems each. With this configuration, we are able to to send 8 messages simultaneously and 170k messages a day. Each message takes 2-4 seconds to be sent, depending on his length.

This module works but you need to write commands your self, it is not a stand-alone-do-all-for-me module so please remenber this and check examples for use-cases.

Feel free to try it and report any issue you have. I'm happy to help and improve.

PDU and concatenated messages

There are no good solutions in JS on NPM you can use to achieve this. I suggest you to use python-messaging and with a simple script file, you can encode/decode correctly messages. If you want to send only TEXT messages, be sure they are 160chars max or the modem will fail with a generic ERROR.

Install

npm install --save node-modem

# if you need a fully working PDU converter:
# npm install --save sms-pdu-node

Usage

var Modem = require('../index');

var modem = new Modem('/dev/tty.usbserial', function(err, data) {
  err && console.error(err);
});

modem.command('AT+CMGF=1', console.log.bind(console));

Sequence

Use this to execute a sequence of commands.

var pdu = require('sms-pdu-node');
var PDU = pdu('ciao', '393420011223', null, 7);

modem.sequence([
  {
    command: 'AT+CMGF=0' // enables PDU mode (check examples for a TEXT send)
  },
  {
    command: PDU.command,
    options: {
      expect: '>'
    }
  },
  {
    command: PDU.pdu,
    options: {
      endline: Modem.ctrlZ
    }
  }
], console.log.bind(console));

Reading data (ie read received sms)

modem.sequence([
  {
    command: 'AT+CMGF=0'
  },
  {
    command: 'AT+CMGL=4' // reads all SIM messages
  }
], console.log.bind(console));

Changelog

• 1.1.8: Improved README
• 1.1.7: Returning values from commands. Useful for reading messages.
• 1.1.6: Minor fixes
• 1.1.5: Improved read when multilines comes from on('data').
• 1.1.4: Now you can pass options.modem to constructor. That object, will be passed to the Serialport constructor.
• 1.1.3: Rewritten parser
• 1.1.2: Fixes some strange issues related on reading data with some modems.
• 1.1.1: Initial release