writeByWait method
Implementation
Future<BleWriteResponse> writeByWait(String content,String serviceUuid,String characteristicUuid,{bool isHex=false}) async{
Completer<BleWriteResponse> bleWriteResultCompleter = Completer();
_temporaryWriteCompleter[characteristicUuid]=bleWriteResultCompleter;
_channel.invokeMethod("write",{"content":content,"serviceUuid":serviceUuid,"characteristicUuid":characteristicUuid,"isHex":isHex});
return await bleWriteResultCompleter.future;
}