esp-idf/examples/protocols/sockets/udp_client/main/udp_client.c

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/* BSD Socket API Example
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <string.h>
#include <sys/param.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event.h"
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#include "esp_log.h"
#include "nvs_flash.h"
#include "esp_netif.h"
#include "protocol_examples_common.h"
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#include "lwip/err.h"
#include "lwip/sockets.h"
#include "lwip/sys.h"
#include <lwip/netdb.h>
#include "addr_from_stdin.h"
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#if defined(CONFIG_EXAMPLE_IPV4)
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#define HOST_IP_ADDR CONFIG_EXAMPLE_IPV4_ADDR
#elif defined(CONFIG_EXAMPLE_IPV6)
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#define HOST_IP_ADDR CONFIG_EXAMPLE_IPV6_ADDR
#else
#define HOST_IP_ADDR ""
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#endif
#define PORT CONFIG_EXAMPLE_PORT
static const char *TAG = "example";
static const char *payload = "Message from ESP32 ";
static void udp_client_task(void *pvParameters)
{
char rx_buffer[128];
char host_ip[] = HOST_IP_ADDR;
int addr_family = 0;
int ip_protocol = 0;
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while (1) {
#if defined(CONFIG_EXAMPLE_IPV4)
struct sockaddr_in dest_addr;
dest_addr.sin_addr.s_addr = inet_addr(HOST_IP_ADDR);
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons(PORT);
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addr_family = AF_INET;
ip_protocol = IPPROTO_IP;
#elif defined(CONFIG_EXAMPLE_IPV6)
struct sockaddr_in6 dest_addr = { 0 };
inet6_aton(HOST_IP_ADDR, &dest_addr.sin6_addr);
dest_addr.sin6_family = AF_INET6;
dest_addr.sin6_port = htons(PORT);
dest_addr.sin6_scope_id = esp_netif_get_netif_impl_index(EXAMPLE_INTERFACE);
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addr_family = AF_INET6;
ip_protocol = IPPROTO_IPV6;
#elif defined(CONFIG_EXAMPLE_SOCKET_IP_INPUT_STDIN)
struct sockaddr_in6 dest_addr = { 0 };
ESP_ERROR_CHECK(get_addr_from_stdin(PORT, SOCK_DGRAM, &ip_protocol, &addr_family, &dest_addr));
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#endif
int sock = socket(addr_family, SOCK_DGRAM, ip_protocol);
if (sock < 0) {
ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
break;
}
ESP_LOGI(TAG, "Socket created, sending to %s:%d", HOST_IP_ADDR, PORT);
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while (1) {
int err = sendto(sock, payload, strlen(payload), 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
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if (err < 0) {
ESP_LOGE(TAG, "Error occurred during sending: errno %d", errno);
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break;
}
ESP_LOGI(TAG, "Message sent");
struct sockaddr_in source_addr; // Large enough for both IPv4 or IPv6
socklen_t socklen = sizeof(source_addr);
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) {
ESP_LOGE(TAG, "recvfrom failed: errno %d", errno);
break;
}
// Data received
else {
rx_buffer[len] = 0; // Null-terminate whatever we received and treat like a string
ESP_LOGI(TAG, "Received %d bytes from %s:", len, host_ip);
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ESP_LOGI(TAG, "%s", rx_buffer);
if (strncmp(rx_buffer, "OK: ", 4) == 0) {
ESP_LOGI(TAG, "Received expected message, reconnecting");
break;
}
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}
vTaskDelay(2000 / portTICK_PERIOD_MS);
}
if (sock != -1) {
ESP_LOGE(TAG, "Shutting down socket and restarting...");
shutdown(sock, 0);
close(sock);
}
}
vTaskDelete(NULL);
}
void app_main(void)
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{
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
* Read "Establishing Wi-Fi or Ethernet Connection" section in
* examples/protocols/README.md for more information about this function.
*/
ESP_ERROR_CHECK(example_connect());
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xTaskCreate(udp_client_task, "udp_client", 4096, NULL, 5, NULL);
}