esp-protocols/components/esp_websocket_client/examples/linux/main/websocket_linux.c

/*
 * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include <esp_log.h>
#include "nvs_flash.h"
#include "protocol_examples_common.h"

#include "esp_websocket_client.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_netif.h"

static const char *TAG = "websocket";

static void log_error_if_nonzero(const char *message, int error_code)
{
    if (error_code != 0) {
        ESP_LOGE(TAG, "Last error %s: 0x%x", message, error_code);
    }
}

static void websocket_event_handler(void *handler_args, esp_event_base_t base, int32_t event_id, void *event_data)
{
    esp_websocket_event_data_t *data = (esp_websocket_event_data_t *)event_data;
    switch (event_id) {
    case WEBSOCKET_EVENT_BEGIN:
        ESP_LOGI(TAG, "WEBSOCKET_EVENT_BEGIN");
        break;
    case WEBSOCKET_EVENT_CONNECTED:
        ESP_LOGI(TAG, "WEBSOCKET_EVENT_CONNECTED");
        break;
    case WEBSOCKET_EVENT_DISCONNECTED:
        ESP_LOGI(TAG, "WEBSOCKET_EVENT_DISCONNECTED");
        log_error_if_nonzero("HTTP status code",  data->error_handle.esp_ws_handshake_status_code);
        if (data->error_handle.error_type == WEBSOCKET_ERROR_TYPE_TCP_TRANSPORT) {
            log_error_if_nonzero("reported from esp-tls", data->error_handle.esp_tls_last_esp_err);
            log_error_if_nonzero("reported from tls stack", data->error_handle.esp_tls_stack_err);
            log_error_if_nonzero("captured as transport's socket errno",  data->error_handle.esp_transport_sock_errno);
        }
        break;
    case WEBSOCKET_EVENT_DATA:
        ESP_LOGI(TAG, "WEBSOCKET_EVENT_DATA");
        ESP_LOGI(TAG, "Received opcode=%d", data->op_code);
        if (data->op_code == 0x08 && data->data_len == 2) {
            ESP_LOGW(TAG, "Received closed message with code=%d", 256 * data->data_ptr[0] + data->data_ptr[1]);
        } else {
            ESP_LOGW(TAG, "Received=%.*s", data->data_len, (char *)data->data_ptr);
        }

        // If received data contains json structure it succeed to parse
        ESP_LOGW(TAG, "Total payload length=%d, data_len=%d, current payload offset=%d\r\n", data->payload_len, data->data_len, data->payload_offset);

        break;
    case WEBSOCKET_EVENT_ERROR:
        ESP_LOGI(TAG, "WEBSOCKET_EVENT_ERROR");
        log_error_if_nonzero("HTTP status code",  data->error_handle.esp_ws_handshake_status_code);
        if (data->error_handle.error_type == WEBSOCKET_ERROR_TYPE_TCP_TRANSPORT) {
            log_error_if_nonzero("reported from esp-tls", data->error_handle.esp_tls_last_esp_err);
            log_error_if_nonzero("reported from tls stack", data->error_handle.esp_tls_stack_err);
            log_error_if_nonzero("captured as transport's socket errno",  data->error_handle.esp_transport_sock_errno);
        }
        break;
    case WEBSOCKET_EVENT_FINISH:
        ESP_LOGI(TAG, "WEBSOCKET_EVENT_FINISH");
        break;
    }
}


static void websocket_app_start(void)
{
    esp_websocket_client_config_t websocket_cfg = {};

    websocket_cfg.uri = CONFIG_WEBSOCKET_URI;

    ESP_LOGI(TAG, "Connecting to %s...", websocket_cfg.uri);

    esp_websocket_client_handle_t client = esp_websocket_client_init(&websocket_cfg);
    // This call demonstrates adding another header; it's called to increase code coverage
    esp_websocket_client_append_header(client, "HeaderNewKey", "value");

    esp_websocket_register_events(client, WEBSOCKET_EVENT_ANY, websocket_event_handler, (void *)client);

    esp_websocket_client_start(client);
    char data[32];
    int i = 0;
    while (i < 1) {
        if (esp_websocket_client_is_connected(client)) {
            int len = sprintf(data, "hello %04d", i++);
            ESP_LOGI(TAG, "Sending %s", data);
            esp_websocket_client_send_text(client, data, len, portMAX_DELAY);
        }
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }

    // Sending text data
    ESP_LOGI(TAG, "Sending fragmented text message");
    memset(data, 'a', sizeof(data));
    esp_websocket_client_send_text_partial(client, data, sizeof(data), portMAX_DELAY);
    memset(data, 'b', sizeof(data));
    esp_websocket_client_send_cont_msg(client, data, sizeof(data), portMAX_DELAY);
    esp_websocket_client_send_fin(client, portMAX_DELAY);

    vTaskDelay(1000 / portTICK_PERIOD_MS);
    // Sending binary data
    ESP_LOGI(TAG, "Sending fragmented binary message");
    char binary_data[128];
    memset(binary_data, 0, sizeof(binary_data));
    esp_websocket_client_send_bin_partial(client, binary_data, sizeof(binary_data), portMAX_DELAY);
    memset(binary_data, 1, sizeof(binary_data));
    esp_websocket_client_send_cont_msg(client, binary_data, sizeof(binary_data), portMAX_DELAY);
    esp_websocket_client_send_fin(client, portMAX_DELAY);

    esp_websocket_client_destroy(client);
}

int main(void)
{

    ESP_LOGI(TAG, "[APP] Startup..");
    ESP_LOGI(TAG, "[APP] Free memory: %" PRIu32 " bytes", esp_get_free_heap_size());
    ESP_LOGI(TAG, "[APP] IDF version: %s", esp_get_idf_version());
    esp_log_level_set("*", ESP_LOG_INFO);
    esp_log_level_set("websocket_client", ESP_LOG_DEBUG);
    esp_log_level_set("transport_ws", ESP_LOG_DEBUG);
    esp_log_level_set("trans_tcp", ESP_LOG_DEBUG);

    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());

    websocket_app_start();
    return 0;
}