Problems with SIM900 module

Hi,

I've been working on Espruino and Sim900 module on my ST Nucleo-F401RE, but I have found some problems with this module: when I send the module code example from web to the board with Espruino Web IDE (from the right side of IDE), I only can receive from USART "Connecting to SIM900 module", no error displays or anything.

Serial1.setup(115200, { rx: B7, tx : B6 });

console.log("Connecting to SIM900 module");
var gprs = require('SIM900').connect(Serial1, B4 /*reset*/, function(err) {
  if(!err) {
    gprs.connect('APN', 'USERNAME', 'PASSWORD', function(err) {
      console.log(err);
      gprs.getIP(function(err, ip) {
        console.log('IP:' + ip);
        require("http").get("http://www.pur3.co.uk/hello.txt", function(res) {
          console.log("Response: ",res);
          res.on('data', function(d) {
            console.log("--->"+d);
          });
        });
      });
    });
  } else {
    console.log(err);
  }
});

I can observe loading the code that some messages appear: "Module NetworkJs not found" and "Module http not found". I know these are built-in, and I have the update firmware on board and last IDE version. This same problem appears too when I try to require CC3000 module.

In addition, I have to change my board too due to the fact that my previous board (Olimexino STM32) couldn't load any module bigger than 4 or 5 kB (for example the BMP085 module, now I can do it, this is not the matter, but I would want to know the cause, because I changed the Olimexino STM32 microController STM32f103RBT6 for the STM32f103RCT6 that has bigger SRAM, but I didn't get it either).

Also, I have worked on this module in other boards with Maple software, and I have always used a pulse of 1200 ms in order to initiate the module, but in JavaScript code I only observe a pulse of 1ms on reset pin. In fact I can't initiate my SIM900 if I don't send this digitalPulse (only with JavaScript code I don't get it).

I would really appreciate if you could help me with this. Thanks