[ERROR] Controlling Other Pucks

Ok, just fixed - turns out there were two issues:

• A memory leak in NRF.connect - I guess most times people use requestDevice so it hadn't been spotted.
  
• A memory leak when an exception is thrown inside a rejected promise.
  
  

If you use one of the latest builds from http://www.espruino.com/binaries/travis/­master/ then it should be fixed now.

I'd modify the final bit of your code though to swap around the console.log and disconnect:

  // ...
    }).catch(function(e) {
      busy=false;      
      console.log("Write value error. ", e);
      if(gatt !== undefined)gatt.disconnect();
    });

Disconnect can cause an error if the bluetooth operation had failed because the device got disconnected - so ideally you'd print the first error or disconnect will throw an exception which will stop the first error getting printed.