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请教各位大佬,我的项目是100多台分布设备,都采用ESP32-S3作为STA,然后他们之间通过UDP广播来无线通讯。
但是我参照《ESP32-C3物联网工程开发实战》里面的“broadcast_discovery”项目例程来改造的程序,接收和发送都保持同一个端口。却总是发送和接收不能同时存在。一旦先发送了,就再也接收不到广播了。而相反,如果先接收了数据,就不能再发送了。 请教各位,我应该怎么做,才能做到同时收发UDP广播呀?有什么方法能类似以前用AT指令的时候那样,设置多链接,然后用两个链接分别配置接收和发送呀?(AT+CIPSTART=0,"UDP","192.168.6.111",6000,3333 AT+CIPSTART=1,"UDP","255.255.255.255",3333,6000) 谢谢大家! 代码如下: static esp_err_t esp_send_broadcast( uint8_t *sendBuf, uint8_t len ) { int opt_val = 1; esp_err_t err = ESP_FAIL; struct sockaddr_in from_addr = {0}; socklen_t from_addr_len = sizeof(struct sockaddr_in); char udp_recv_buf[64 + 1] = {0}; // 创建 IPv4 UDP 套接字 int sockfd = socket(AF_INET, SOCK_DGRAM, 0); if (sockfd == -1) { return err; } // 设置 SO_BROADCAST 套接字选项, 使能该套接字支持广播发送 int ret = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &opt_val, sizeof(int)); if (ret < 0) { goto exit; } // 设置广播目的地址和端口 struct sockaddr_in dest_addr = { .sin_family = AF_INET, .sin_port = htons(3333), .sin_addr.s_addr = htonl(INADDR_BROADCAST), }; // 调用 sendto 接口发送广播数据 ret = sendto(sockfd, sendBuf, len, 0, (struct sockaddr *)&dest_addr, sizeof(struct sockaddr)); exit: close(sockfd); return err; } void app_main(void) { uartInit(); esp_err_t err = ESP_FAIL; struct sockaddr_in from_addr = {0}; socklen_t from_addr_len = sizeof(struct sockaddr_in); uint8_t udp_server_buf[64 + 1] = {0}; char *udp_server_send_buf = "ESP32-C3 Smart Light https 443"; int sockfd = 0;//IPv4 UDP 套接字 int ret = 0; // 设置广播目的地址和端口 struct sockaddr_in server_addr = { .sin_family = AF_INET, .sin_port = htons(6000), .sin_addr.s_addr = htonl(INADDR_ANY), }; while(1) { // 调用 recvfrom 接口接收广播数据 ret = recvfrom(sockfd, udp_server_buf, sizeof(udp_server_buf) - 1, 0, (struct sockaddr *)&from_addr, (socklen_t *)&from_addr_len); if (ret > 0) { uartSend(udp_server_buf, ret); } int res = uartReadData(); if(res == 1)//连接WIFI { //Initialize NVS esp_err_t ret = nvs_flash_init(); if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) { ESP_ERROR_CHECK(nvs_flash_erase()); ret = nvs_flash_init(); } ESP_ERROR_CHECK(ret); ESP_LOGI(TAG, "ESP_WIFI_MODE_STA"); int a = wifi_init_sta(); if(a == 1) { uint8_t buf[3] = {01,02,03}; uartSend(buf, sizeof(buf)); //ret = esp_send_broadcast_Init(); } else { uint8_t buf[3] = {01,03,04}; uartSend(buf, sizeof(buf)); } } else if(res == 2)//建立UDP服务 { //uint8_t buf[3] = {03,03,06}; //uartSend(buf, sizeof(buf)); // 创建 IPv4 UDP 套接字 sockfd = socket(AF_INET, SOCK_DGRAM, 0); if (sockfd == -1) { uartSendData("socket error!"); } ret = bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)); if (ret < 0) { uartSendData("bind error!"); close(sockfd); } } else if(res == 5)//配置UDP发送套接字 { //ret = esp_send_broadcast_Init(); if(!ret) { uint8_t buf[3] = {03,03,06}; //uartSend(buf, sizeof(buf)); } else { uint8_t buf[3] = {03,04,07}; uartSend(buf, sizeof(buf)); } } else if(res == 3)//test { uint8_t buf[9] = {8,8,6,6,7,6,6,8,8}; //uartSend(buf, sizeof(buf)); esp_send_broadcast(buf, 9); } else if(res == 4)//test2 { uint8_t buf[10] = {1,2,3,4,5,6,7,8,9,0}; esp_send_broadcast(buf, 10); } else if(res == 6)//正常命令 { esp_send_broadcast(uartRXBuf, uartRXBufLen); } } } |
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