Esprunio pico wifi module

I am using the GSM2 Click with the espruino for GSM. There is an AT library (https://github.com/espruino/EspruinoDocs/blob/master/modules/AT.js) that has been utilised within the wifi modules and some of the others. I am using this library to send commands to my GSM module.

Example code:

var at = require("AT").connect(Serial4);

function SendSMS(phone_num,message,callback){
  at.cmd('AT+CMGS=\"'+phone_num+'\"\r',1000,function(e){
    console.log('Phone number set:' + phone_num);
    at.cmd(message,1000,function(f){
      console.log('Message text set:' +message);
      at.cmd("\x1A\r",1000,function(g){
        console.log('Sending');
        return callback('Message sent');
      });
    });
  });
}