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服务端为上位机部分。客户端为下位机部分，下位机有多个MCU，所以就会有不同的IP地址。上位机实现接收下位机的信息，并区别不同的IP发来的信息。通信端口5000
服务端：IP设置为196.168.1.100
int sock_fd = socket(PF_INET, SOCK_DGRAM, 0);
if(sock_fd < 0) { printf("error: Create Socket Failed!"); return -1; } struct sockaddr_in sock_addr; sock_addr.sin_family = AF_INET; sock_addr.sin_port = htons(5000); sock_addr.sin_addr.s_addr = htonl(INADDR_ANY); memset(sock_addr.sin_zero, 0x00, 8); try { if(bind(sock_fd, (struct sockaddr *)&sock_addr, sizeof(struct sockaddr)) != 0) //绑定 { printf("error: Bind Socket Failed!"); res = -1; throw res; } char buf[256]; int recvslen; struct sockaddr_in from; uint32_t fromlen = sizeof(struct sockaddr); while(1) { if((recvslen = recvfrom(sock_fd, recvs, 256, 0, (struct sockaddr *)&from , &fromlen)) == -1) { printf("error: Receiving Failed!"); res = -1; throw res; } else { if(recvslen < 256) *(recvs+recvslen) = ‘\0‘; else *(recvs+255) = ‘\0‘; printf("Received data:\n[%s] from 196.168.1.2\n",recvs); } } } catch(...) { printf("error catched~"); } int sock_fd = socket(PF_INET, SOCK_DGRAM, 0);
if(sock_fd < 0) { printf("error: Create Socket Failed!"); return -1; } struct sockaddr_in addrTo; addrTo.sin_family = AF_INET; addrTo.sin_port = htons(5000); addrTo.sin_addr.s_addr = htonl("196.168.1.100"); //服务端的地址 memset(addrTo.sin_zero, 0x00, 8); try { char buf[256] = "This is from 196.168.1.2"; int n; struct sockaddr_in to; uint32_t tolen = sizeof(struct sockaddr); while(1) { if((n= recvfrom(sock_fd, recvs, 5000, 0, (struct sockaddr *)&addrTo, &tolen)) == -1) { printf("error: Receiving Failed!"); res = -1; throw res; } else if (n > 0) { printf("Send data to 196.168.1.100\n"); } } } catch(...) { printf("error catched~"); }标签：
原文地址：http://www.cnblogs.com/blue-sky-hahaha/p/4676714.html
