Method echo

UnitTests/sources/SocketTest.cpp:168–175

	}

	bool echo(Exception& ex,const UInt8* data,UInt32 size) {
		{
			lock_guard<Mutex> lock(_mutex);
			_datas.emplace_back(size);
			memcpy(_datas.back().data(), data, size);
		}
		return _socket.send(ex, data, size);
	}

private: