124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* 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"
|
|
#include "esp_log.h"
|
|
#include "nvs_flash.h"
|
|
#include "tcpip_adapter.h"
|
|
#include "protocol_examples_common.h"
|
|
|
|
#include "lwip/err.h"
|
|
#include "lwip/sockets.h"
|
|
#include "lwip/sys.h"
|
|
#include <lwip/netdb.h>
|
|
|
|
|
|
#ifdef CONFIG_EXAMPLE_IPV4
|
|
#define HOST_IP_ADDR CONFIG_EXAMPLE_IPV4_ADDR
|
|
#else
|
|
#define HOST_IP_ADDR CONFIG_EXAMPLE_IPV6_ADDR
|
|
#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 addr_str[128];
|
|
int addr_family;
|
|
int ip_protocol;
|
|
|
|
while (1) {
|
|
|
|
#ifdef 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);
|
|
addr_family = AF_INET;
|
|
ip_protocol = IPPROTO_IP;
|
|
inet_ntoa_r(dest_addr.sin_addr, addr_str, sizeof(addr_str) - 1);
|
|
#else // IPV6
|
|
struct sockaddr_in6 dest_addr;
|
|
inet6_aton(HOST_IP_ADDR, &dest_addr.sin6_addr);
|
|
dest_addr.sin6_family = AF_INET6;
|
|
dest_addr.sin6_port = htons(PORT);
|
|
addr_family = AF_INET6;
|
|
ip_protocol = IPPROTO_IPV6;
|
|
inet6_ntoa_r(dest_addr.sin6_addr, addr_str, sizeof(addr_str) - 1);
|
|
#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);
|
|
|
|
while (1) {
|
|
|
|
int err = sendto(sock, payload, strlen(payload), 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
|
|
if (err < 0) {
|
|
ESP_LOGE(TAG, "Error occurred during sending: errno %d", errno);
|
|
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);
|
|
|
|
// Error occurred during receiving
|
|
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, addr_str);
|
|
ESP_LOGI(TAG, "%s", rx_buffer);
|
|
}
|
|
|
|
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)
|
|
{
|
|
ESP_ERROR_CHECK(nvs_flash_init());
|
|
tcpip_adapter_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());
|
|
|
|
xTaskCreate(udp_client_task, "udp_client", 4096, NULL, 5, NULL);
|
|
}
|