subscribe method
Subscribes to a Bluetooth characteristic to listen for updates.
A caller to this function will receive a Stream of BleCharacteristicValue objects. A caller should listen to this stream and establish a callback function invoked each time a new value is emitted to the stream. Once subscribed, any updates to the characteristic value will be sent as a stream of BleCharacteristicValue objects.
Implementation
Stream<BleCharacteristicValue> subscribe() {
return CentralPlatformInterface.instance.subscribeToCharacteristic(this);
}