A Javascript library for the GSM/GPRS based on the sim900js library: https://github.com/sensamo/sim900js

• HTTP GET/POST use same function
• Commands return array of lines from the raw response
• Commands that have response data now properly include the data
• Improved response handling
• Constructor has default values now
• HTTP response isn't treated as an error now. The response is broken out into separate array items for easier access.
• HTTPS support
• Retry initial AT connect 3 times
• On connect, load device information - useful for debugging and verifying everything is working
• No longer errors out if HTTP service is already initialized.
• Added command for getting signal strength.

GSM.js does not have SMS functionality. I didn't need it for my project and didn't get a chance to test it.

var gsm = new GSM();
gsm.connect(function(err) {
    if(err) return console.log('Error connecting to GSM', err);
    console.log('GSM connected');
    gsm.status(function(err, resp, raw){
       console.log('Status...' + raw[1] + ',' + raw[2]); 
       gsm.initialize(function(err, resp, raw){           
            // Do things here
       });
    });
});

gsm.request('https://httpbin.org/ip', function(response) {
    console.log('-> ' + response);
});

gsm.request('https://httpbin.org/post',
  {
      method: 1,
      data: JSON.stringify(data),
      contentType: 'application/json'
  }, function(response) {
      console.log('-> ' + response);
});