discoveryService method
void
discoveryService()
发现设备服务
Implementation
void discoveryService() {
if (_state != DeviceState.destroyed && _state == DeviceState.connected) {
//已连接才能去发现服务
FlutterBlueElves.instance._channel
.invokeMethod('discoverService', {"id": _id}); //去发现服务
}
}