Widget idea: BLE Battery Service

Hi - that sounds like a good idea...

But yes, multiple calls to NRF.setAdvertising() could overwrite each other. To work around it you could do:

if (!Bangle.bleAdvert) Bangle.bleAdvert = {};
function advertiseBattery() {
  Bangle.bleAdvert[0x180F] = [E.getBattery()];
   NRF.setAdvertising(Bangle.bleAdvert);
}

Then as long as other apps followed the same form they could all work together