Trying to build a small GSM library

var cmd="";
var issued_command="";

Serial4.setup(9600,{rx:C11,tx:C10});

//Parse response v2
function parse(buffer){
  var line = buffer.toString().substring(0, buffer.length - 1);
  //Remove anything remotely blank or echoey
  if(line.length < 2 || line.indexOf(">")===0 || issued_command===line){
     return;
  }
  issued_command="";
  //SMS Received


  if(line.indexOf("+")>-1){
    var d = line.substr(line.indexOf("+")+1,line.indexOf(":")-1); 
       switch(d) {

         case "CMTI":
           tnum = line.split(",");
           console.log("SMS received #", tnum[1]);
           setTimeout(function(){send_command("at+cmgr="+tnum[1]+"\r");},1000);
           break;
          //read incoming SMS

         case "CSQ":
           sgnl = line.slice(5);
           sgnl = sgnl.split(",");
           console.log("signal strength "+sgnl[0]);
           //console.log(line);
           break;
           //Read cell signal

         case "CMGL":
           //console.log("all text messages in memory ");
           break;
           //View all text message in memory

           case "CMGR":
           console.log("text message "+line);
           break;
         //read individual text message in memory
         case "COPS":
           ntwk = line.slice(5);
           ntwk = ntwk.split(",");
           console.log("network "+ ntwk[2]);
           break;
           //Read network carrier

         case "CBC":
           chg = line.split(",");
           console.log("battery charge " + chg[1] + "% + " + chg[2] + "mv's");
           break;
          //read battery charge

    }

     }

   //Turn on LED's if command sent!  
   else if (line.indexOf("Lights on")>-1) {
    console.log("do something");
    LED.write(1);
    LED2.write(1);
  }

    //Turn off LED's if command sent. 
    else if (line.indexOf("lights off")>-1) {
    LED.write(0);
    LED2.write(0); 
  }

     else {
  //Response Received
  console.log("Parsed: " + line);
     }}
  //Serial on data v2
Serial4.on('data',function(data){
cmd += data;
  var id = cmd.indexOf("\n");
  while (id>=0){
  var line = cmd.substr(0,id);
  cmd=cmd.substr(id+1);
  parse(line);
  id=cmd.indexOf("\n");
  }
});
  // get network carier
function get_network() {
  setTimeout(function(){send_command("at+cops?\r");},200);

}
  //get signal strength
function get_signal() {
  setTimeout(function(){send_command("at+csq\r");},200);
  }
  //read all texts in memory
function read_all_text() {
  setTimeout(function(){send_command("at+cmgl=\"all\"\r");},200);

}
  //bet battery % charge and voltage
function get_voltage() {
  setTimeout(function(){send_command("at+cbc\r");},200);

}

function Send_SMS(text)
{
  Start_GSM();
  setTimeout(function(){send(text);},1000);
}
  //Start the GSM Module
function Start_GSM() {

  console.log("GSM Starting...");
  pinMode(C0,"output");
  digitalPulse(C0,1,2000);
  setTimeout(function(){send_command("at+cmgf=1\r");},1000);
}
function Stop_GSM(){
pinMode(C0,"output");
digitalPulse(C0,1,2000);
}
function send(input){
  setTimeout(function(){send_command("AT+CMGS=\"xxxxxxxxxx\"\r");},2000);
  setTimeout(function(){send_command(input);},3000);
  setTimeout(function(){send_command("\x1A\r");},3500);
  setTimeout(function(){Stop_GSM();},10000);
}
function send_command(command){
//Set the command that we are sending to issue_command for later parse out
issued_command=command;
//Send the command to serial port connected to GSM
  Serial4.write(command);
//Output what we sent to console
  console.log("Command Sent:" + command);
}
function onInit(){
  // send SMS when BTN pressed
  setWatch(function(e) { Send_SMS("Saying hello! "); }, BTN, { repeat:true, edge:'falling', debounce:20 });
//Send_SMS("Saying hello ");
}
onInit();