RAK8212 - Cannot connect to network after some time

Thanks @Gordon,

Yes, By serial I mean over Bluetooth. I'm really not sure what's happening.

RDY is sent when ME initialization is successful. But I never received it before, now i'm wondering, in the GSM/GPRS example, there is a wait of 30 seconds before connecting to GSM.

var gprs;
console.log("Turning Cell on");
require("iTracker").setCellOn(true, function(usart) {
  console.log("Waiting 30 sec for GPRS connection");
  setTimeout(function() {
     // ...
 },30000);

Is it really necessary? Because I ain't doing it.
Should I wait that long before registering to the network?