NRF Disconnect reason help

I'm afraid those constants aren't defined in JS - they just come from the Nordic Softdevice.

Doing var BLE_HCI_REMOTE_USER_TERMINATED_CONNECTIO­N = 0x13 as you suggest would really help I reckon.

Of course I guess you could also do:

var reasons = [];
 NRF.on('disconnect', function (reason) {
    reasons.push(reason);
  });

And then check out what was in reasons when you reconnect?