Trying to build a small GSM library

This is where I'm at after a refresh.

var cmd="";

//Function handles data coming in from Serial.
Serial4.on('data',function (c) {

  if(c==="\r")
  {  
    parseResponse(cmd);
    cmd="";
  }
   cmd+=c;
});


//Parse responses on data received on serial
function parseResponse(buffer){
   if(buffer.length < 2)
     return; 

     if(buffer.indexOf("ERROR:")>0){
     console.log("Error - forcing shutdown");
      Stop_GSM();   
      }
    else
     {
       console.log(buffer);
     }
}



function Send_SMS(text)
{
  Start_GSM();
  setTimeout(function(){send(text);},10000);
}


//Start the GSM Module
function Start_GSM() {
  Serial4.setup(9600);
  console.log("GSM Starting...");
  pinMode(C0,"output");
  digitalPulse(C0,1,2000);
}

function Stop_GSM(){
pinMode(C0,"output");
digitalPulse(C0,1,2000);
}



function send(input){
    setTimeout(function(){send_command("AT+CMGS=\"number here\"\r");},2000);
    setTimeout(function(){send_command(input+"\x1A\r");},3000);
  setTimeout(function(){Stop_GSM();},10000);
}



function send_command(command){
//Send the command to serial port connected to GSM
  Serial4.write(command);
}



function onInit(){
Send_SMS("Heyyyy!");
}

onInit();

For me the timed sending of commands is enough to get things running and sending texts. I just need to add in my GPS code and I'll have a tracker that can sms coords to twilio. My JS skills arent up to doing anything better.