(I believe many people have used flying pigeon to transmit books. This gadget is efficient and convenient in transmitting data on the LAN. I wanted to see the source code of flying pigeon to transmit books when I was a sophomore, but my level was limited at that time. I had the opportunity to rewrite flying pigeon to transmit books these days, and I also did in-depth research on the network protocol of IPMsg. I also want to thank the author of IPMsg for opening the source code.)