LivoxProto1: Add UdpCommandDemuxer.

We haven't genericized it with an unordered_map or integrated it
into device.cpp's async methods yet.

commonLibs/livoxProto1/device.h

@@ -140,6 +140,12 @@ public:
 	std::atomic<bool> pcloudDataActive;
 	int pcloudDataFd;  // Socket file descriptor for point cloud data reception
 
+public:
+	// UDP datagram handling
+	void handleUdpDgram(
+		const uint8_t* data, ssize_t bytesReceived,
+		const struct sockaddr_in& senderAddr);
+
 private:
 	// Point cloud data setup
 	bool setupPcloudDataSocket();