134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
#include <lwip/netdb.h>
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#include <string.h>
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#include <sys/param.h>
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#include "esp_err.h"
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#include "esp_event.h"
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#include "esp_log.h"
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#include "esp_netif.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "light.c"
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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 "nvs_flash.h"
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#define UDP_PORT 23042
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static const char *UDP_SERVER_TAG = "UDP_SERVER";
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static void udp_server_task(void *pvParameters) {
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char rx_buffer[1024];
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char addr_str[128];
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int addr_family = (int)pvParameters;
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int ip_protocol = 0;
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struct sockaddr_in6 dest_addr;
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while (1) {
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if (addr_family == AF_INET) {
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struct sockaddr_in *dest_addr_ip4 = (struct sockaddr_in *)&dest_addr;
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dest_addr_ip4->sin_addr.s_addr = htonl(INADDR_ANY);
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dest_addr_ip4->sin_family = AF_INET;
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dest_addr_ip4->sin_port = htons(UDP_PORT);
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ip_protocol = IPPROTO_IP;
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}
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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(UDP_SERVER_TAG, "Unable to create socket: errno %d. sock: %d",
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errno, sock);
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break;
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}
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ESP_LOGI(UDP_SERVER_TAG, "Socket created");
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// Set timeout
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struct timeval timeout;
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout);
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int err = bind(sock, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
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if (err < 0) {
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ESP_LOGE(UDP_SERVER_TAG, "Socket unable to bind: errno %d. sock: %d",
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errno, sock);
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}
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ESP_LOGI(UDP_SERVER_TAG, "Socket bound, port %d", UDP_PORT);
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struct sockaddr_storage source_addr; // Large enough for both IPv4 or IPv6
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socklen_t socklen = sizeof(source_addr);
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while (1) {
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// ESP_LOGI(UDP_SERVER_TAG, "Waiting for data");
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int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer) - 1, 0,
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(struct sockaddr *)&source_addr, &socklen);
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// Error occurred during receiving
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if (len < 0) {
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if (errno == EAGAIN) {
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continue;
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}
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ESP_LOGE(UDP_SERVER_TAG, "recvfrom failed: errno %d. len: %d", errno,
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len);
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}
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// Data received
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else {
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// Get the sender's ip address as string
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if (source_addr.ss_family == PF_INET) {
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inet_ntoa_r(((struct sockaddr_in *)&source_addr)->sin_addr, addr_str,
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sizeof(addr_str) - 1);
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rx_buffer[len] = 0; // Null-terminate whatever we received and treat
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// like a string...
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switch (rx_buffer[0]) {
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case 1:
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sendto(sock, rx_buffer, 1, 0, (struct sockaddr *)&source_addr,
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sizeof(source_addr));
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break;
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case 2:
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set_display_ambient_light_colors(
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((uint16_t)rx_buffer[1] << 8 | (uint16_t)rx_buffer[2]),
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(uint8_t *)&(rx_buffer[3]), len - 3);
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break;
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default:
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ESP_LOGI(UDP_SERVER_TAG, "%s", rx_buffer);
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break;
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}
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int err =
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sendto(sock, rx_buffer, len, 0, (struct sockaddr *)&source_addr,
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sizeof(source_addr));
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if (err < 0) {
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ESP_LOGI(UDP_SERVER_TAG, "Received %d bytes from %s:", len,
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addr_str);
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ESP_LOGE(UDP_SERVER_TAG,
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"Error occurred during sending: errno %d. sock: %d", errno,
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sock);
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shutdown(sock, 0);
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close(sock);
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break;
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}
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}
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}
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if (sock != -1 && len < 0) {
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ESP_LOGE(UDP_SERVER_TAG, "Shutting down socket and restarting...");
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shutdown(sock, 0);
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close(sock);
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break;
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}
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}
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}
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vTaskDelete(NULL);
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}
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void udp_server_init(void) {
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ESP_ERROR_CHECK(nvs_flash_init());
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ESP_ERROR_CHECK(esp_netif_init());
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xTaskCreate(udp_server_task, "udp_server", 4096, (void *)AF_INET, 5, NULL);
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} |