127 lines
4 KiB
C
127 lines
4 KiB
C
/* BSD Socket API Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <string.h>
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#include <sys/param.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "esp_event.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "esp_netif.h"
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#include "protocol_examples_common.h"
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#include "lwip/err.h"
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#include "lwip/sockets.h"
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#include "lwip/sys.h"
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#include <lwip/netdb.h>
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#ifdef CONFIG_EXAMPLE_IPV4
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#define HOST_IP_ADDR CONFIG_EXAMPLE_IPV4_ADDR
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#else
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#define HOST_IP_ADDR CONFIG_EXAMPLE_IPV6_ADDR
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#endif
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#define PORT CONFIG_EXAMPLE_PORT
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static const char *TAG = "example";
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static const char *payload = "Message from ESP32 ";
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static void udp_client_task(void *pvParameters)
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{
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char rx_buffer[128];
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char addr_str[128];
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int addr_family;
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int ip_protocol;
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while (1) {
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#ifdef CONFIG_EXAMPLE_IPV4
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struct sockaddr_in dest_addr;
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dest_addr.sin_addr.s_addr = inet_addr(HOST_IP_ADDR);
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dest_addr.sin_family = AF_INET;
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dest_addr.sin_port = htons(PORT);
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addr_family = AF_INET;
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ip_protocol = IPPROTO_IP;
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inet_ntoa_r(dest_addr.sin_addr, addr_str, sizeof(addr_str) - 1);
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#else // IPV6
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struct sockaddr_in6 dest_addr = { 0 };
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inet6_aton(HOST_IP_ADDR, &dest_addr.sin6_addr);
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dest_addr.sin6_family = AF_INET6;
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dest_addr.sin6_port = htons(PORT);
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// Setting scope_id to the connecting interface for correct routing if IPv6 Local Link supplied
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dest_addr.sin6_scope_id = esp_netif_get_netif_impl_index(EXAMPLE_INTERFACE);
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addr_family = AF_INET6;
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ip_protocol = IPPROTO_IPV6;
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inet6_ntoa_r(dest_addr.sin6_addr, addr_str, sizeof(addr_str) - 1);
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#endif
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int sock = socket(addr_family, SOCK_DGRAM, ip_protocol);
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if (sock < 0) {
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ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
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break;
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}
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ESP_LOGI(TAG, "Socket created, sending to %s:%d", HOST_IP_ADDR, PORT);
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while (1) {
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int err = sendto(sock, payload, strlen(payload), 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
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if (err < 0) {
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ESP_LOGE(TAG, "Error occurred during sending: errno %d", errno);
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break;
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}
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ESP_LOGI(TAG, "Message sent");
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struct sockaddr_in source_addr; // Large enough for both IPv4 or IPv6
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socklen_t socklen = sizeof(source_addr);
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int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer) - 1, 0, (struct sockaddr *)&source_addr, &socklen);
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// Error occurred during receiving
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if (len < 0) {
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ESP_LOGE(TAG, "recvfrom failed: errno %d", errno);
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break;
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}
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// Data received
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else {
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rx_buffer[len] = 0; // Null-terminate whatever we received and treat like a string
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ESP_LOGI(TAG, "Received %d bytes from %s:", len, addr_str);
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ESP_LOGI(TAG, "%s", rx_buffer);
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}
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vTaskDelay(2000 / portTICK_PERIOD_MS);
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}
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if (sock != -1) {
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ESP_LOGE(TAG, "Shutting down socket and restarting...");
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shutdown(sock, 0);
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close(sock);
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}
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}
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vTaskDelete(NULL);
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}
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void app_main(void)
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{
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ESP_ERROR_CHECK(nvs_flash_init());
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ESP_ERROR_CHECK(esp_netif_init());
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
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* Read "Establishing Wi-Fi or Ethernet Connection" section in
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* examples/protocols/README.md for more information about this function.
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*/
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ESP_ERROR_CHECK(example_connect());
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xTaskCreate(udp_client_task, "udp_client", 4096, NULL, 5, NULL);
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}
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