212 lines
6.9 KiB
C
212 lines
6.9 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_loop.h"
|
|
#include "esp_log.h"
|
|
#include "nvs_flash.h"
|
|
|
|
#include "lwip/err.h"
|
|
#include "lwip/sockets.h"
|
|
#include "lwip/sys.h"
|
|
#include <lwip/netdb.h>
|
|
|
|
|
|
/* The examples use simple WiFi configuration that you can set via
|
|
'make menuconfig'.
|
|
If you'd rather not, just change the below entries to strings with
|
|
the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
|
|
*/
|
|
#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
|
|
#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
|
|
|
|
#define PORT CONFIG_EXAMPLE_PORT
|
|
|
|
/* FreeRTOS event group to signal when we are connected & ready to make a request */
|
|
static EventGroupHandle_t wifi_event_group;
|
|
|
|
const int IPV4_GOTIP_BIT = BIT0;
|
|
const int IPV6_GOTIP_BIT = BIT1;
|
|
|
|
static const char *TAG = "example";
|
|
|
|
static esp_err_t event_handler(void *ctx, system_event_t *event)
|
|
{
|
|
switch (event->event_id) {
|
|
case SYSTEM_EVENT_STA_START:
|
|
esp_wifi_connect();
|
|
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
|
|
break;
|
|
case SYSTEM_EVENT_STA_CONNECTED:
|
|
/* enable ipv6 */
|
|
tcpip_adapter_create_ip6_linklocal(TCPIP_ADAPTER_IF_STA);
|
|
break;
|
|
case SYSTEM_EVENT_STA_GOT_IP:
|
|
xEventGroupSetBits(wifi_event_group, IPV4_GOTIP_BIT);
|
|
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
|
|
break;
|
|
case SYSTEM_EVENT_STA_DISCONNECTED:
|
|
/* This is a workaround as ESP32 WiFi libs don't currently auto-reassociate. */
|
|
esp_wifi_connect();
|
|
xEventGroupClearBits(wifi_event_group, IPV4_GOTIP_BIT);
|
|
xEventGroupClearBits(wifi_event_group, IPV6_GOTIP_BIT);
|
|
break;
|
|
case SYSTEM_EVENT_AP_STA_GOT_IP6:
|
|
xEventGroupSetBits(wifi_event_group, IPV6_GOTIP_BIT);
|
|
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP6");
|
|
|
|
char *ip6 = ip6addr_ntoa(&event->event_info.got_ip6.ip6_info.ip);
|
|
ESP_LOGI(TAG, "IPv6: %s", ip6);
|
|
default:
|
|
break;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
static void initialise_wifi(void)
|
|
{
|
|
tcpip_adapter_init();
|
|
wifi_event_group = xEventGroupCreate();
|
|
ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
|
|
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
|
|
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
|
|
ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
|
|
wifi_config_t wifi_config = {
|
|
.sta = {
|
|
.ssid = EXAMPLE_WIFI_SSID,
|
|
.password = EXAMPLE_WIFI_PASS,
|
|
},
|
|
};
|
|
ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
|
|
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
|
|
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
|
|
ESP_ERROR_CHECK( esp_wifi_start() );
|
|
}
|
|
|
|
static void wait_for_ip()
|
|
{
|
|
uint32_t bits = IPV4_GOTIP_BIT | IPV6_GOTIP_BIT ;
|
|
|
|
ESP_LOGI(TAG, "Waiting for AP connection...");
|
|
xEventGroupWaitBits(wifi_event_group, bits, false, true, portMAX_DELAY);
|
|
ESP_LOGI(TAG, "Connected to AP");
|
|
}
|
|
|
|
static void tcp_server_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 destAddr;
|
|
destAddr.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
destAddr.sin_family = AF_INET;
|
|
destAddr.sin_port = htons(PORT);
|
|
addr_family = AF_INET;
|
|
ip_protocol = IPPROTO_IP;
|
|
inet_ntoa_r(destAddr.sin_addr, addr_str, sizeof(addr_str) - 1);
|
|
#else // IPV6
|
|
struct sockaddr_in6 destAddr;
|
|
bzero(&destAddr.sin6_addr.un, sizeof(destAddr.sin6_addr.un));
|
|
destAddr.sin6_family = AF_INET6;
|
|
destAddr.sin6_port = htons(PORT);
|
|
addr_family = AF_INET6;
|
|
ip_protocol = IPPROTO_IPV6;
|
|
inet6_ntoa_r(destAddr.sin6_addr, addr_str, sizeof(addr_str) - 1);
|
|
#endif
|
|
|
|
int listen_sock = socket(addr_family, SOCK_STREAM, ip_protocol);
|
|
if (listen_sock < 0) {
|
|
ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
|
|
break;
|
|
}
|
|
ESP_LOGI(TAG, "Socket created");
|
|
|
|
int err = bind(listen_sock, (struct sockaddr *)&destAddr, sizeof(destAddr));
|
|
if (err != 0) {
|
|
ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
|
|
break;
|
|
}
|
|
ESP_LOGI(TAG, "Socket binded");
|
|
|
|
err = listen(listen_sock, 1);
|
|
if (err != 0) {
|
|
ESP_LOGE(TAG, "Error occured during listen: errno %d", errno);
|
|
break;
|
|
}
|
|
ESP_LOGI(TAG, "Socket listening");
|
|
|
|
struct sockaddr_in6 sourceAddr; // Large enough for both IPv4 or IPv6
|
|
uint addrLen = sizeof(sourceAddr);
|
|
int sock = accept(listen_sock, (struct sockaddr *)&sourceAddr, &addrLen);
|
|
if (sock < 0) {
|
|
ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);
|
|
break;
|
|
}
|
|
ESP_LOGI(TAG, "Socket accepted");
|
|
|
|
while (1) {
|
|
int len = recv(sock, rx_buffer, sizeof(rx_buffer) - 1, 0);
|
|
// Error occured during receiving
|
|
if (len < 0) {
|
|
ESP_LOGE(TAG, "recv failed: errno %d", errno);
|
|
break;
|
|
}
|
|
// Connection closed
|
|
else if (len == 0) {
|
|
ESP_LOGI(TAG, "Connection closed");
|
|
break;
|
|
}
|
|
// Data received
|
|
else {
|
|
// Get the sender's ip address as string
|
|
if (sourceAddr.sin6_family == PF_INET) {
|
|
inet_ntoa_r(((struct sockaddr_in *)&sourceAddr)->sin_addr.s_addr, addr_str, sizeof(addr_str) - 1);
|
|
} else if (sourceAddr.sin6_family == PF_INET6) {
|
|
inet6_ntoa_r(sourceAddr.sin6_addr, addr_str, sizeof(addr_str) - 1);
|
|
}
|
|
|
|
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);
|
|
|
|
int err = send(sock, rx_buffer, len, 0);
|
|
if (err < 0) {
|
|
ESP_LOGE(TAG, "Error occured during sending: errno %d", errno);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sock != -1) {
|
|
ESP_LOGE(TAG, "Shutting down socket and restarting...");
|
|
shutdown(sock, 0);
|
|
close(sock);
|
|
}
|
|
}
|
|
vTaskDelete(NULL);
|
|
}
|
|
|
|
void app_main()
|
|
{
|
|
ESP_ERROR_CHECK( nvs_flash_init() );
|
|
initialise_wifi();
|
|
wait_for_ip();
|
|
|
|
xTaskCreate(tcp_server_task, "tcp_server", 4096, NULL, 5, NULL);
|
|
}
|