BLE notifications on nRF devices

The way to expose BLE services on nRF devices is to use NRF.setServices (cf. doc).

It is possible to set broadcast: true for broadcasting but not notify: true. The fix to make it available is pretty straightforward:

@ jswrap_bluetooth.c:1420 @ void jswrap_nrf_bluetooth_setServices(JsVar *data) {
       memset(&char_md, 0, sizeof(char_md));
       if (jsvGetBoolAndUnLock(jsvObjectGetChild(charVar, "broadcast", 0)))
         char_md.char_props.broadcast = 1;
       if (jsvGetBoolAndUnLock(jsvObjectGetChild(charVar, "notify", 0)))
         char_md.char_props.notify = 1;
       if (jsvGetBoolAndUnLock(jsvObjectGetChild(charVar, "readable", 0)))
         char_md.char_props.read = 1;
       if (jsvGetBoolAndUnLock(jsvObjectGetChild(charVar, "writable", 0))) {

With the above fix, it is possible to set a characteristic to NOTIFY like so:

NRF.setServices({
  0x0000: {
    0x0001: {
      value : "Hello",
      maxLen : 5,
      readable : true,
      notify : true
    }
  }
});

However, what would be the best way to update the characteristic's value? Calling NRF.setServices repeatedly does not seem to be the way to go.