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Dear friends, does anyone have a demo about UDP multicast? Can you send it to me? I was studying Ximen Daguanren's course @西門大官人 recently, and suddenly I thought that I still have a Xiaomi air-conditioning companion at home that supports LAN communication protocols. I was thinking about using my semi-finished web server to directly access the air-conditioning companion through the LAN to implement data web. Check. However, the communication methods described in the communication protocol document include UDP multicast unicast transmission and UDP multicast unicast reception. There are many types of communication, but I have never made any code about multicast. I would like to ask for a demo to learn from it