<onNotify ble android never called what I'm doing ...

# stackoverflow

[user]

onNotify ble android never called what I'm doing wrong?
I want to read records data from glucometer. That characteristic is not able to read or write, only set notifications. Iuse writeDescriptor and it's return true but there is no any onCharacteristicChanged callbacks
override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Log.w("BLE", "onServicesDiscovered ")
val service = gatt.getService(GLUCOSE_SERVICE)
val characteristic =...