1.\u00a0\u5355\u64ad<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123225-680246595511d.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5355\u64ad（unicast），\u662f\u6307\u5c01\u5305\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u7684\u4f20\u8f93\u4e2d，\u76ee\u7684\u5730\u5740\u4e3a\u5355\u4e00\u76ee\u6807\u7684\u4e00\u79cd\u4f20\u8f93\u65b9\u5f0f\u3002\u5b83\u662f\u73b0\u4eca\u7f51\u7edc\u5e94\u7528\u6700\u4e3a\u5e7f\u6cdb，\u901a\u5e38\u6240\u4f7f\u7528\u7684\u7f51\u7edc\u534f\u8bae\u6216\u670d\u52a1\u5927\u591a\u91c7\u7528\u5355\u64ad\u4f20\u8f93，\u4f8b\u5982TCP\u534f\u8bae\u3002<\/p>\n
2. \u591a\u64ad<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123225-680246596493f.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ec4\u64ad（multicast），\u4e5f\u53eb\u591a\u64ad\u6216\u7fa4\u64ad\u3002 \u6307\u628a\u4fe1\u606f\u540c\u65f6\u4f20\u9012\u7ed9\u4e00\u7ec4\u76ee\u7684\u5730\u5740\u3002\u5b83\u4f7f\u7528\u7b56\u7565\u662f\u6700\u9ad8\u6548\u7684，\u56e0\u4e3a\u6d88\u606f\u5728\u6bcf\u6761\u7f51\u7edc\u94fe\u8def\u4e0a\u53ea\u9700\u4f20\u9012\u4e00\u6b21，\u800c\u4e14\u53ea\u6709\u5728\u94fe\u8def\u5206\u53c9\u7684\u65f6\u5019，\u6d88\u606f\u624d\u4f1a\u88ab\u590d\u5236\u3002<\/p>\n
3. \u5e7f\u64ad<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123225-68024659732b5.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5e7f\u64ad（broadcast），\u662f\u6307\u5c01\u5305\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u4e2d\u4f20\u8f93\u65f6，\u76ee\u7684\u5730\u5740\u4e3a\u7f51\u7edc\u4e2d\u6240\u6709\u8bbe\u5907\u7684\u4e00\u79cd\u4f20\u8f93\u65b9\u5f0f\u3002<\/p>\n
2. lwIP<\/h2>\n
\u00a0\u00a0 \u00a0 \u00a0 \u00a0 ESP-IDF\u4f7f\u7528lwIP\u5e93\u5b9e\u73b0TCP\/IP\u534f\u8bae\u6808，\u8fd9\u4e2a\u5e93\u5728\u5927\u591a\u6570\u5d4c\u5165\u5f0f\u7cfb\u7edf\u4e2d\u90fd\u6709\u7528\u5230，\u5b83\u662f\u4e00\u4e2a\u8f7b\u91cf\u7684TCP\/IP\u534f\u8bae\u5c42\u5957\u4ef6\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u652f\u6301\u4ee5\u4e0b\u7279\u6027：<\/p>\n
- \n
- IP (Internet Protocol, IPv4 and IPv6) including packet forwarding over multiple network interfaces<\/span><\/li>\n
- ICMP (Internet Control Message Protocol) for network maintenance and debugging<\/span><\/li>\n
- IGMP (Internet Group Management Protocol) for multicast traffic management<\/span><\/li>\n
- MLD (Multicast listener discovery for IPv6). Aims to be compliant with RFC 2710. No support for MLDv2<\/span><\/li>\n
- ND\u00a0(Neighbor discovery and stateless address autoconfiguration for IPv6). Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862 (Address autoconfiguration)<\/span><\/li>\n
- DHCP, AutoIP\/APIPA (Zeroconf) and (stateless) DHCPv6<\/span><\/li>\n
- UDP (User Datagram Protocol) including experimental UDP-lite extensions<\/span><\/li>\n
- TCP (Transmission Control Protocol) with congestion control, RTT estimation fast recovery\/fast retransmit and sending SACKs<\/span><\/li>\n
- raw\/native API for enhanced performance<\/span><\/li>\n
- Optional Berkeley-like socket API<\/span><\/li>\n
- TLS: optional layered TCP ("altcp") for nearly transparent TLS for any<\/span><\/li>\n
- TCP-based protocol (ported to mbedTLS) (see changelog for more info)<\/span><\/li>\n
- PPPoS and PPPoE (Point-to-point protocol over Serial\/Ethernet)<\/span><\/li>\n
- DNS (Domain name resolver incl. mDNS)<\/span><\/li>\n
- 6LoWPAN (via IEEE 802.15.4, BLE or ZEP)<\/span><\/li>\n<\/ul>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u652f\u6301\u4ee5\u4e0b\u5e94\u7528\u5c42\u534f\u8bae：<\/p>\n
- \n
- HTTP server with SSI and CGI (HTTPS via altcp)<\/span><\/li>\n
- SNMPv2c agent with MIB compiler (Simple Network Management Protocol), v3 via altcp<\/span><\/li>\n
- SNTP (Simple network time protocol)<\/span><\/li>\n
- NetBIOS name service responder<\/span><\/li>\n
- MDNS (Multicast DNS) responder<\/span><\/li>\n
- iPerf server implementation<\/span><\/li>\n
- MQTT client (TLS support via altcp)<\/span><\/li>\n<\/ul>\n
3. \u4f8b\u7a0b<\/h2>\n
\u00a0\u00a0 \u00a0 \u00a0 \u00a0 \u4f8b\u7a0b\u5206\u522b\u5728ESP32\u4e0a\u5b9e\u73b0TCP\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef，\u4f7f\u7528\u7535\u8111\u4f5c\u4e3a\u53e6\u4e00\u65b9\u8fdb\u884c\u7b80\u5355\u901a\u4fe1\u6d4b\u8bd5\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f，\u6d4b\u8bd5\u65f6，ESP32\u548c\u7535\u8111\u5fc5\u987b\u5904\u4e8e\u540c\u4e00\u5c40\u57df\u7f51<\/span>\u3002\u00a0<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u7535\u8111\u7aef\u6d4b\u8bd5\u4f7f\u7528\u7684\u4e0a\u4f4d\u673a\u4e3aVOFA+，\u4e0b\u8f7d\u5730\u5740：VOFA+<\/p>\n
3.1 \u53d1\u9001\u7aef<\/h3>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u4e2a\u4f8b\u7a0b\u914d\u7f6eESP32\u4e3a\u53d1\u9001\u7aef，\u5f53\u8fde\u63a5WiFi\u70ed\u70b9\u6210\u529f\u540e\u4f1a\u5411\u76ee\u6807IP\u6bcf\u96941\u79d2\u53d1\u9001\u4e00\u6bb5\u6570\u636e\u3002<\/p>\n
#include "freertos\/FreeRTOS.h"
\n#include "freertos\/queue.h"
\n#include "freertos\/semphr.h"
\n#include "esp_system.h"
\n#include "esp_wifi.h"
\n#include "esp_event.h"
\n#include "esp_log.h"
\n#include "esp_mac.h"
\n#include "nvs_flash.h"
\n#include "sys\/socket.h"
\n#include "lwip\/err.h"
\n#include "lwip\/sys.h"
\n#include "netdb.h"
\n#include "arpa\/inet.h"<\/p>\n#include <string.h><\/p>\n
#define TAG "app"
\n#define HOST_IP_ADDR "172.16.10.26"
\n#define HOST_PORT 20001<\/p>\nstatic const char *payload = "Hello from ESP32\\\\r\\\\n";
\nstatic TaskHandle_t client_task_handle;<\/p>\nstatic void udp_client_task(void *args)
\n{
\n struct sockaddr_in dest_addr;
\n dest_addr.sin_addr.s_addr = inet_addr(HOST_IP_ADDR);
\n dest_addr.sin_family = AF_INET;
\n dest_addr.sin_port = htons(HOST_PORT);<\/p>\nint sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
\n if (sock < 0) {
\n ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
\n }
\n ESP_LOGI(TAG, "Socket created, sending to %s:%d", HOST_IP_ADDR, HOST_PORT);<\/p>\nwhile (1) {
\n int err = sendto(sock, payload, strlen(payload), 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
\n if (err < 0) {
\n ESP_LOGE(TAG, "Error occurred during sending: errno %d", errno);
\n break;
\n }
\n ESP_LOGI(TAG, "Message sent");<\/p>\nvTaskDelay(1000 \/ portTICK_PERIOD_MS);
\n }<\/p>\nclose(sock);
\n vTaskDelete(NULL);
\n}<\/p>\nstatic void wifi_event_handler(void* arg,
\n esp_event_base_t event_base,
\n int32_t event_id,
\n void* event_data)
\n{
\n if (event_base == IP_EVENT) {
\n if (event_id == IP_EVENT_STA_GOT_IP) {
\n xTaskCreate(udp_client_task, "udp_client", 4096, NULL, 5, &client_task_handle);
\n }
\n } else if (event_base == WIFI_EVENT) {
\n if (event_id == WIFI_EVENT_STA_DISCONNECTED) {
\n vTaskDelete(client_task_handle);
\n } else if (event_id == WIFI_EVENT_STA_START) {
\n esp_wifi_connect();
\n }
\n }
\n}<\/p>\nint app_main()
\n{
\n \/* \u521d\u59cb\u5316NVS *\/
\n esp_err_t ret = nvs_flash_init();
\n if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
\n ESP_ERROR_CHECK(nvs_flash_erase());
\n ESP_ERROR_CHECK(nvs_flash_init());
\n }<\/p>\n\/* \u521d\u59cb\u5316WiFi\u534f\u8bae\u6808 *\/
\n ESP_ERROR_CHECK(esp_netif_init());
\n ESP_ERROR_CHECK(esp_event_loop_create_default());
\n esp_netif_create_default_wifi_sta();<\/p>\nwifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
\n ESP_ERROR_CHECK(esp_wifi_init(&cfg));<\/p>\nESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
\n ESP_EVENT_ANY_ID,
\n &wifi_event_handler,
\n NULL,
\n NULL));<\/p>\nESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
\n ESP_EVENT_ANY_ID,
\n &wifi_event_handler,
\n NULL,
\n NULL));<\/p>\nwifi_config_t wifi_config = {
\n .sta = {
\n .ssid = "QXL",
\n .password = "88888888",
\n .threshold.authmode = WIFI_AUTH_WPA_WPA2_PSK,
\n },
\n };<\/p>\nESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
\n ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
\n ESP_ERROR_CHECK(esp_wifi_start());<\/p>\nreturn 0;
\n}<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ESP32\u7684WiFi\u9a71\u52a8\u521d\u59cb\u5316\u5728\u524d\u9762\u7684\u6587\u7ae0\u5df2\u7ecf\u6709\u8be6\u7ec6\u7684\u4ecb\u7ecd\u4e86，\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u56e0\u4e3aUDP\u662f\u9762\u5411\u65e0\u8fde\u63a5\u7684，\u6240\u4ee5\u7f16\u7a0b\u4f1a\u76f8\u5bf9\u7b80\u5355，\u6d41\u7a0b\u5982\u4e0b：<\/p>\n
1. \u521b\u5efa\u5957\u63a5\u5b57<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8c03\u7528socket\u51fd\u6570\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570\u8868\u793aIP\u534f\u8bae，\u8fd9\u91cc\u4f7f\u7528IPv4，\u5bf9\u5e94IP_INET；\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8868\u793asocket\u7c7b\u578b，UDP\u534f\u8bae\u53ea\u80fd\u586bSOCK_DGRAM；\u7b2c\u4e09\u4e2a\u53c2\u6570\u8868\u793a\u534f\u8bae\u6808\u7c7b\u578b，\u8fd9\u91cc\u586bIPPROTO_IP\u3002\u51fd\u6570\u4f1a\u8fd4\u56de\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u3002<\/p>\n
2. \u5957\u63a5\u5b57\u914d\u7f6e（\u53ef\u9009）<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 socket\u7684\u63a5\u6536\u548c\u53d1\u9001\u9ed8\u8ba4\u662f\u963b\u585e\u7684，\u5373\u5982\u679c\u6570\u636e\u4e0d\u5230\u8fbe\u5c31\u4e00\u76f4\u7b49\u5f85，\u6240\u4ee5\u6839\u636e\u5e94\u7528\u7684\u9700\u8981\u8bbe\u7f6e\u63a5\u6536\u7684\u8d85\u65f6\u65f6\u95f4\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8c03\u7528setsockopt\u51fd\u6570\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26；\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u534f\u8bae\u5c42，\u5fc5\u987b\u586bSOL_SOCKET；\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3a\u8bbe\u7f6e\u9879，\u586bSO_RCVTIMEO，\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4，\u5f53\u7136\u51fd\u6570\u8fd8\u652f\u6301\u4ee5\u4e0b\u914d\u7f6e\u9879：<\/p>\n
#define SO_DEBUG 0x0001 \/* Unimplemented: turn on debugging info recording *\/
\n#define SO_ACCEPTCONN 0x0002 \/* socket has had listen() *\/
\n#define SO_DONTROUTE 0x0010 \/* Unimplemented: just use interface addresses *\/
\n#define SO_USELOOPBACK 0x0040 \/* Unimplemented: bypass hardware when possible *\/
\n#define SO_LINGER 0x0080 \/* linger on close if data present *\/
\n#define SO_DONTLINGER ((int)(~SO_LINGER))
\n#define SO_OOBINLINE 0x0100 \/* Unimplemented: leave received OOB data in line *\/
\n#define SO_REUSEPORT 0x0200 \/* Unimplemented: allow local address & port reuse *\/
\n#define SO_SNDBUF 0x1001 \/* Unimplemented: send buffer size *\/
\n#define SO_RCVBUF 0x1002 \/* receive buffer size *\/
\n#define SO_SNDLOWAT 0x1003 \/* Unimplemented: send low-water mark *\/
\n#define SO_RCVLOWAT 0x1004 \/* Unimplemented: receive low-water mark *\/
\n#define SO_SNDTIMEO 0x1005 \/* send timeout *\/
\n#define SO_RCVTIMEO 0x1006 \/* receive timeout *\/
\n#define SO_ERROR 0x1007 \/* get error status and clear *\/
\n#define SO_TYPE 0x1008 \/* get socket type *\/
\n#define SO_CONTIMEO 0x1009 \/* Unimplemented: connect timeout *\/
\n#define SO_NO_CHECK 0x100a \/* don't create UDP checksum *\/
\n#define SO_BINDTODEVICE 0x100b \/* bind to device *\/<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u6bd4\u8f83\u5e38\u7528\u7684\u5c31\u662fSO_RCVTIMEO，\u8bbe\u7f6e\u63a5\u6536\u8d85\u65f6；SO_SNDTIMEO，\u8bbe\u7f6e\u53d1\u9001\u8d85\u65f6\u3002\u4e0a\u9762\u5e26Unimlemented\u6ce8\u91ca\u7684\u662fESP-IDF\u4e0d\u652f\u6301\u7684\u914d\u7f6e<\/span>\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u6bcf\u79cd\u914d\u7f6e\u9879\u9700\u8981\u4f20\u5165\u7684\u6570\u636e\u662f\u4e0d\u4e00\u6837\u7684，\u7528\u4e4b\u524d\u5efa\u8bae\u53c2\u8003\u5b98\u65b9\u7684\u8bf4\u660e\u6587\u6863\u3002\u8bbe\u7f6e\u8d85\u65f6\u4f20\u5165\u7684\u662fstruct timeval\u8fd9\u4e2a\u7ed3\u6784\u4f53\u3002<\/p>\n
struct timeval {
\ntime_ttv_sec;
\nsuseconds_ttv_usec;
\n};<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 tv_sec\u8bbe\u7f6e\u79d2\u6570，tv_usec\u8bbe\u7f6e\u5fae\u79d2\u6570\u3002<\/p>\n
3. \u53d1\u9001\u6570\u636e<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8c03\u7528sendto\u51fd\u6570\u3002\u53c2\u65701\u4e3a\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26；\u53c2\u65702\u4e3a\u6570\u636e\u6307\u9488；\u53c2\u65703\u4e3a\u6570\u636e\u957f\u5ea6；\u53c2\u65704\u4e3a\u6807\u5fd7\u4f4d，\u6709\u4ee5\u4e0b\u9009\u9879：<\/p>\n
#define MSG_PEEK 0x01
\n#define MSG_WAITALL 0x02
\n#define MSG_OOB 0x04
\n#define MSG_DONTWAIT 0x08
\n#define MSG_MORE 0x10
\n#define MSG_NOSIGNAL 0x20 <\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u8fd9\u4e9b\u6807\u5fd7\u4f4d\u662f\u53d1\u9001\u548c\u63a5\u6536\u90fd\u652f\u6301\u7684，\u6bd4\u8f83\u5e38\u7528\u7684\u662fMSG_DONTWAIT，\u50cf\u53d1\u9001\u548c\u63a5\u6536\u51fd\u6570\u662f\u963b\u585e\u7684，\u4f7f\u80fd\u8fd9\u4e2a\u6807\u5fd7\u4f4d\u53ef\u4ee5\u8ba9\u51fd\u6570\u7acb\u5373\u8fd4\u56de，\u4e0d\u7b49\u5f85\u6570\u636e\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u53c2\u65705\u4e3a\u76ee\u6807\u5730\u5740\u4fe1\u606f，\u7ed3\u6784\u4f53\u5982\u4e0b：<\/p>\n
struct sockaddr_in {
\n u8_t sin_len;
\n sa_family_t sin_family;
\n in_port_t sin_port;
\n struct in_addr sin_addr;
\n#define SIN_ZERO_LEN 8
\n char sin_zero[SIN_ZERO_LEN];
\n};
\n#endif \/* LWIP_IPV4 *\/<\/p>\n- \n
- sin_len：\u6570\u636e\u957f\u5ea6（\u4e00\u822c\u4e0d\u9700\u8981\u586b）；<\/li>\n
- sin_family：\u5957\u63a5\u5b57\u7c7b\u578b，IPv4\u586bAF_INET，IPv6\u586bAF_INET6，\u5176\u4ed6\u586bAF_UNSPEC；<\/li>\n
- sin_port：\u7aef\u53e3；<\/li>\n
- sin_zero：\u9884\u7559\u5b57\u8282（\u4e0d\u7528\u7ba1）\u3002<\/li>\n<\/ul>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u53c2\u65706\u4e3a\u76ee\u6807\u5730\u5740\u7ed3\u6784\u4f53\u957f\u5ea6\u3002<\/p>\n
4. \u5173\u95ed\u8fde\u63a5<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8c03\u7528close\u51fd\u6570\u3002\u4f20\u5165\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u5373\u53ef\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u4f7f\u7528\u4e0a\u4f4d\u673a\u65f6，\u6570\u636e\u5f15\u64ce\u9009\u62e9\u201cRawData\u201d，\u6570\u636e\u63a5\u53e3\u9009\u62e9UDP，\u8fdc\u7a0bIP\u586b\u5199ESP32\u83b7\u53d6\u5230\u7684IP，\u672c\u5730\u7aef\u53e3\u8981\u4e0eESP32\u53d1\u9001\u62a5\u6587\u7684\u7aef\u53e3\u4e00\u81f4<\/span>\u3002\u8bbe\u7f6e\u597d\u540e，\u70b9\u51fb\u5de6\u4e0a\u89d2\u7684\u5706\u5f62\u6309\u94ae\u5373\u53ef\u542f\u52a8\u8fde\u63a5，\u5728\u4e0b\u9762\u6587\u672c\u6846\u80fd\u770b\u5230\u63a5\u6536\u5230\u7684\u6d88\u606f\u3002<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123225-680246598230b.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123226-6802465acca33.png\")
<\/p>\n2.2 \u63a5\u6536\u7aef<\/h3>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8fd9\u4e2a\u4f8b\u7a0b\u521b\u5efa\u4e00\u4e2aUDP\u63a5\u6536\u7aef，\u63a5\u6536\u6240\u6709\u53d1\u9001\u81f3\u6307\u5b9a\u7aef\u53e3\u7684UDP\u5305\u3002\u00a0<\/p>\n
#include "freertos\/FreeRTOS.h"
\n#include "freertos\/queue.h"
\n#include "freertos\/semphr.h"
\n#include "esp_system.h"
\n#include "esp_wifi.h"
\n#include "esp_event.h"
\n#include "esp_log.h"
\n#include "esp_mac.h"
\n#include "nvs_flash.h"
\n#include "sys\/socket.h"
\n#include "lwip\/err.h"
\n#include "lwip\/sys.h"
\n#include "netdb.h"
\n#include "arpa\/inet.h"<\/p>\n#include <string.h><\/p>\n
#define TAG "app"
\n#define SERVER_PORT 20001<\/p>\nstatic TaskHandle_t server_task_handle;<\/p>\n
static void udp_server_task(void *args)
\n{
\n char rx_buffer[128];<\/p>\nstruct sockaddr_in dest_addr;
\n dest_addr.sin_addr.s_addr = htonl(IPADDR_ANY);
\n dest_addr.sin_family = AF_INET;
\n dest_addr.sin_port = htons(SERVER_PORT);<\/p>\nint sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
\n if (sock < 0) {
\n ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
\n }<\/p>\nint opt = 0;
\n setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &opt, sizeof(int));<\/p>\nint err = bind(sock, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
\n if (err < 0) {
\n ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
\n goto __exit;
\n }
\n ESP_LOGI(TAG, "Socket bound to port %d", SERVER_PORT);<\/p>\nwhile (1) {
\n struct sockaddr_in source_addr = {0};
\n socklen_t socklen = sizeof(source_addr);
\n memset(rx_buffer, 0, sizeof(rx_buffer));
\n int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer) – 1, 0, (struct sockaddr *)&source_addr, &socklen);
\n if (len < 0) {
\n ESP_LOGE(TAG, "recvfrom failed: errno %d", errno);
\n } else {
\n ESP_LOGI(TAG, "Received %d bytes from " IPSTR ":%d, data: %s", len, IP2STR((esp_ip4_addr_t *) &source_addr.sin_addr), source_addr.sin_port, rx_buffer);
\n }
\n }<\/p>\n__exit:
\n close(sock);
\n vTaskDelete(NULL);
\n}<\/p>\nstatic void wifi_event_handler(void* arg,
\n esp_event_base_t event_base,
\n int32_t event_id,
\n void* event_data)
\n{
\n if (event_base == IP_EVENT) {
\n if (event_id == IP_EVENT_STA_GOT_IP) {
\n xTaskCreate(udp_server_task, "udp_server", 4096, NULL, 5, &server_task_handle);
\n }
\n } else if (event_base == WIFI_EVENT) {
\n if (event_id == WIFI_EVENT_STA_DISCONNECTED) {
\n vTaskDelete(server_task_handle);
\n } else if (event_id == WIFI_EVENT_STA_START) {
\n esp_wifi_connect();
\n }
\n }
\n}<\/p>\nint app_main()
\n{
\n \/* \u521d\u59cb\u5316NVS *\/
\n esp_err_t ret = nvs_flash_init();
\n if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
\n ESP_ERROR_CHECK(nvs_flash_erase());
\n ESP_ERROR_CHECK(nvs_flash_init());
\n }<\/p>\n\/* \u521d\u59cb\u5316WiFi\u534f\u8bae\u6808 *\/
\n ESP_ERROR_CHECK(esp_netif_init());
\n ESP_ERROR_CHECK(esp_event_loop_create_default());
\n esp_netif_create_default_wifi_sta();<\/p>\nwifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
\n ESP_ERROR_CHECK(esp_wifi_init(&cfg));<\/p>\nESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
\n ESP_EVENT_ANY_ID,
\n &wifi_event_handler,
\n NULL,
\n NULL));<\/p>\nESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
\n ESP_EVENT_ANY_ID,
\n &wifi_event_handler,
\n NULL,
\n NULL));<\/p>\nwifi_config_t wifi_config = {
\n .sta = {
\n .ssid = "Your SSID",
\n .password = "Your password",
\n .threshold.authmode = WIFI_AUTH_WPA_WPA2_PSK,
\n },
\n };<\/p>\nESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
\n ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
\n ESP_ERROR_CHECK(esp_wifi_start());<\/p>\nreturn 0;
\n}<\/p>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u63a5\u6536\u8005\u7684\u6d41\u7a0b\u548c\u53d1\u9001\u8005\u5dee\u4e0d\u591a，\u4e0b\u9762\u53ea\u4ecb\u7ecd\u6709\u5dee\u5f02\u7684\u90e8\u5206\u3002<\/p>\n
1. \u521b\u5efa\u5957\u63a5\u5b57<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u53c2\u8003\u524d\u9762\u3002<\/p>\n
2. \u914d\u7f6e\u5957\u63a5\u5b57（\u53ef\u9009）<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8c03\u7528setsockopt\u51fd\u6570\u3002\u9664\u4e86\u524d\u9762\u4ecb\u7ecd\u5230\u7684\u914d\u7f6e，UDP\u8fd8\u652f\u6301\u4e00\u4e2aSO_BROADCAST\u7684\u914d\u7f6e，\u7528\u6765\u4f7f\u80fd\u5e7f\u64ad\u5305\u7684\u63a5\u6536，\u6211\u8fd9\u91cc\u662f\u914d\u7f6e\u4e3a\u7981\u7528\u3002<\/p>\n
3. \u7ed1\u5b9aIP（\u53ef\u9009）<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0\u00a0\u8c03\u7528bind\u51fd\u6570\u3002\u53c2\u65701\u4e3a\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26，\u53c2\u65702\u4e3aIP\u5730\u5740\u7ed3\u6784\u4f53，\u53c2\u65703\u4e3a\u7ed3\u6784\u4f53\u957f\u5ea6\u3002\u901a\u8fc7bind\u53ef\u4ee5\u7ed1\u5b9a\u76d1\u542c\u7684IP\u5730\u5740\u548c\u7aef\u53e3，\u53ea\u6709\u63a5\u6536\u5230\u7684\u6570\u636e\u5305\u76ee\u6807IP\u548c\u7aef\u53e3\u4e00\u81f4\u624d\u4f1a\u5904\u7406，\u6211\u8fd9\u91cc\u914d\u7f6e\u63a5\u6536\u4efb\u610fIP，\u7aef\u53e3\u4e3a20001\u3002<\/p>\n
4. \u63a5\u6536\u6570\u636e<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u8c03\u7528recvfrom\u51fd\u6570\u3002\u4f20\u5165\u53c2\u6570\u548csendto\u4e00\u81f4，\u4e0d\u540c\u7684\u662f\u540e\u9762\u7684IP\u5730\u5740\u7ed3\u6784\u4f53\u662f\u8f93\u51fa\u53c2\u6570，\u4e0d\u9700\u8981\u521d\u59cb\u5316，\u5b83\u4f1a\u8fd4\u56de\u6570\u636e\u5305\u7684\u6e90IP\u4fe1\u606f\u3002<\/p>\n
5. \u5173\u95ed\u5957\u63a5\u5b57<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u53c2\u8003\u524d\u9762\u3002<\/p>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u4e0a\u4f4d\u673a\u7684\u914d\u7f6e\u548c\u524d\u9762\u57fa\u672c\u4e00\u6837，\u552f\u4e00\u7684\u4e0d\u540c\u662f\u8fdc\u7a0b\u7aef\u53e3\u8981\u4fdd\u8bc1\u548cESP32\u7ed1\u5b9a\u7684\u7aef\u53e3\u4e00\u81f4<\/span>\u3002<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123227-6802465b1d8ce.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418123228-6802465c68ba2.png\")
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