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esp-idf/components/esp_websocket_client/esp_websocket_client.c

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdio.h>
#include "esp_websocket_client.h"
#include "esp_transport.h"
#include "esp_transport_tcp.h"
#include "esp_transport_ssl.h"
#include "esp_transport_ws.h"
/* using uri parser */
#include "http_parser.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "freertos/event_groups.h"
#include "esp_log.h"
#include "esp_timer.h"
static const char *TAG = "WEBSOCKET_CLIENT";
#define WEBSOCKET_TCP_DEFAULT_PORT (80)
#define WEBSOCKET_SSL_DEFAULT_PORT (443)
#define WEBSOCKET_BUFFER_SIZE_BYTE (1024)
#define WEBSOCKET_RECONNECT_TIMEOUT_MS (10*1000)
#define WEBSOCKET_TASK_PRIORITY (5)
#define WEBSOCKET_TASK_STACK (4*1024)
#define WEBSOCKET_NETWORK_TIMEOUT_MS (10*1000)
#define WEBSOCKET_PING_TIMEOUT_MS (10*1000)
#define WEBSOCKET_EVENT_QUEUE_SIZE (1)
#define ESP_WS_CLIENT_MEM_CHECK(TAG, a, action) if (!(a)) { \
ESP_LOGE(TAG,"%s:%d (%s): %s", __FILE__, __LINE__, __FUNCTION__, "Memory exhausted"); \
action; \
}
const static int STOPPED_BIT = BIT0;
ESP_EVENT_DEFINE_BASE(WEBSOCKET_EVENTS);
typedef struct {
int task_stack;
int task_prio;
char *uri;
char *host;
char *path;
char *scheme;
char *username;
char *password;
int port;
bool auto_reconnect;
void *user_context;
int network_timeout_ms;
char *subprotocol;
char *user_agent;
char *headers;
} websocket_config_storage_t;
typedef enum {
WEBSOCKET_STATE_ERROR = -1,
WEBSOCKET_STATE_UNKNOW = 0,
WEBSOCKET_STATE_INIT,
WEBSOCKET_STATE_CONNECTED,
WEBSOCKET_STATE_WAIT_TIMEOUT,
} websocket_client_state_t;
struct esp_websocket_client {
esp_event_loop_handle_t event_handle;
esp_transport_list_handle_t transport_list;
esp_transport_handle_t transport;
websocket_config_storage_t *config;
websocket_client_state_t state;
uint64_t keepalive_tick_ms;
uint64_t reconnect_tick_ms;
uint64_t ping_tick_ms;
int wait_timeout_ms;
int auto_reconnect;
bool run;
EventGroupHandle_t status_bits;
xSemaphoreHandle lock;
char *rx_buffer;
char *tx_buffer;
int buffer_size;
ws_transport_opcodes_t last_opcode;
};
static uint64_t _tick_get_ms(void)
{
return esp_timer_get_time()/1000;
}
static esp_err_t esp_websocket_client_dispatch_event(esp_websocket_client_handle_t client,
esp_websocket_event_id_t event,
const char *data,
int data_len)
{
esp_err_t err;
esp_websocket_event_data_t event_data;
event_data.data_ptr = data;
event_data.data_len = data_len;
event_data.op_code = client->last_opcode;
if ((err = esp_event_post_to(client->event_handle,
WEBSOCKET_EVENTS, event,
&event_data,
sizeof(esp_websocket_event_data_t),
portMAX_DELAY)) != ESP_OK) {
return err;
}
return esp_event_loop_run(client->event_handle, 0);
}
static esp_err_t esp_websocket_client_abort_connection(esp_websocket_client_handle_t client)
{
esp_transport_close(client->transport);
client->wait_timeout_ms = WEBSOCKET_RECONNECT_TIMEOUT_MS;
client->reconnect_tick_ms = _tick_get_ms();
client->state = WEBSOCKET_STATE_WAIT_TIMEOUT;
ESP_LOGI(TAG, "Reconnect after %d ms", client->wait_timeout_ms);
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_DISCONNECTED, NULL, 0);
return ESP_OK;
}
static esp_err_t esp_websocket_client_set_config(esp_websocket_client_handle_t client, const esp_websocket_client_config_t *config)
{
websocket_config_storage_t *cfg = client->config;
cfg->task_prio = config->task_prio;
if (cfg->task_prio <= 0) {
cfg->task_prio = WEBSOCKET_TASK_PRIORITY;
}
cfg->task_stack = config->task_stack;
if (cfg->task_stack == 0) {
cfg->task_stack = WEBSOCKET_TASK_STACK;
}
if (config->host) {
cfg->host = strdup(config->host);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->host, return ESP_ERR_NO_MEM);
}
if (config->port) {
cfg->port = config->port;
}
if (config->username) {
free(cfg->username);
cfg->username = strdup(config->username);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->username, return ESP_ERR_NO_MEM);
}
if (config->password) {
free(cfg->password);
cfg->password = strdup(config->password);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->password, return ESP_ERR_NO_MEM);
}
if (config->uri) {
free(cfg->uri);
cfg->uri = strdup(config->uri);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->uri, return ESP_ERR_NO_MEM);
}
if (config->path) {
free(cfg->path);
cfg->path = strdup(config->path);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->path, return ESP_ERR_NO_MEM);
}
if (config->subprotocol) {
free(cfg->subprotocol);
cfg->subprotocol = strdup(config->subprotocol);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->subprotocol, return ESP_ERR_NO_MEM);
}
if (config->user_agent) {
free(cfg->user_agent);
cfg->user_agent = strdup(config->user_agent);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->user_agent, return ESP_ERR_NO_MEM);
}
if (config->headers) {
free(cfg->headers);
cfg->headers = strdup(config->headers);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->headers, return ESP_ERR_NO_MEM);
}
cfg->network_timeout_ms = WEBSOCKET_NETWORK_TIMEOUT_MS;
cfg->user_context = config->user_context;
cfg->auto_reconnect = true;
if (config->disable_auto_reconnect) {
cfg->auto_reconnect = false;
}
return ESP_OK;
}
static esp_err_t esp_websocket_client_destroy_config(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
websocket_config_storage_t *cfg = client->config;
if (client->config == NULL) {
return ESP_ERR_INVALID_ARG;
}
free(cfg->host);
free(cfg->uri);
free(cfg->path);
free(cfg->scheme);
free(cfg->username);
free(cfg->password);
free(cfg->subprotocol);
free(cfg->user_agent);
free(cfg->headers);
memset(cfg, 0, sizeof(websocket_config_storage_t));
free(client->config);
client->config = NULL;
return ESP_OK;
}
static void set_websocket_transport_optional_settings(esp_websocket_client_handle_t client, esp_transport_handle_t trans)
{
if (trans && client->config->path) {
esp_transport_ws_set_path(trans, client->config->path);
}
if (trans && client->config->subprotocol) {
esp_transport_ws_set_subprotocol(trans, client->config->subprotocol);
}
if (trans && client->config->user_agent) {
esp_transport_ws_set_user_agent(trans, client->config->user_agent);
}
if (trans && client->config->headers) {
esp_transport_ws_set_headers(trans, client->config->headers);
}
}
esp_websocket_client_handle_t esp_websocket_client_init(const esp_websocket_client_config_t *config)
{
esp_websocket_client_handle_t client = calloc(1, sizeof(struct esp_websocket_client));
ESP_WS_CLIENT_MEM_CHECK(TAG, client, return NULL);
esp_event_loop_args_t event_args = {
.queue_size = WEBSOCKET_EVENT_QUEUE_SIZE,
.task_name = NULL // no task will be created
};
if (esp_event_loop_create(&event_args, &client->event_handle) != ESP_OK) {
ESP_LOGE(TAG, "Error create event handler for websocket client");
free(client);
return NULL;
}
client->lock = xSemaphoreCreateRecursiveMutex();
ESP_WS_CLIENT_MEM_CHECK(TAG, client->lock, goto _websocket_init_fail);
client->config = calloc(1, sizeof(websocket_config_storage_t));
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config, goto _websocket_init_fail);
client->transport_list = esp_transport_list_init();
ESP_WS_CLIENT_MEM_CHECK(TAG, client->transport_list, goto _websocket_init_fail);
esp_transport_handle_t tcp = esp_transport_tcp_init();
ESP_WS_CLIENT_MEM_CHECK(TAG, tcp, goto _websocket_init_fail);
esp_transport_set_default_port(tcp, WEBSOCKET_TCP_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, tcp, "_tcp"); // need to save to transport list, for cleanup
esp_transport_handle_t ws = esp_transport_ws_init(tcp);
ESP_WS_CLIENT_MEM_CHECK(TAG, ws, goto _websocket_init_fail);
esp_transport_set_default_port(ws, WEBSOCKET_TCP_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, ws, "ws");
if (config->transport == WEBSOCKET_TRANSPORT_OVER_TCP) {
asprintf(&client->config->scheme, "ws");
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
}
esp_transport_handle_t ssl = esp_transport_ssl_init();
ESP_WS_CLIENT_MEM_CHECK(TAG, ssl, goto _websocket_init_fail);
esp_transport_set_default_port(ssl, WEBSOCKET_SSL_DEFAULT_PORT);
if (config->cert_pem) {
esp_transport_ssl_set_cert_data(ssl, config->cert_pem, strlen(config->cert_pem));
}
esp_transport_list_add(client->transport_list, ssl, "_ssl"); // need to save to transport list, for cleanup
esp_transport_handle_t wss = esp_transport_ws_init(ssl);
ESP_WS_CLIENT_MEM_CHECK(TAG, wss, goto _websocket_init_fail);
esp_transport_set_default_port(wss, WEBSOCKET_SSL_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, wss, "wss");
if (config->transport == WEBSOCKET_TRANSPORT_OVER_SSL) {
asprintf(&client->config->scheme, "wss");
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
}
if (config->uri) {
if (esp_websocket_client_set_uri(client, config->uri) != ESP_OK) {
ESP_LOGE(TAG, "Invalid uri");
goto _websocket_init_fail;
}
}
if (esp_websocket_client_set_config(client, config) != ESP_OK) {
ESP_LOGE(TAG, "Failed to set the configuration");
goto _websocket_init_fail;
}
if (client->config->scheme == NULL) {
asprintf(&client->config->scheme, "ws");
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
}
set_websocket_transport_optional_settings(client, esp_transport_list_get_transport(client->transport_list, "ws"));
set_websocket_transport_optional_settings(client, esp_transport_list_get_transport(client->transport_list, "wss"));
client->keepalive_tick_ms = _tick_get_ms();
client->reconnect_tick_ms = _tick_get_ms();
client->ping_tick_ms = _tick_get_ms();
int buffer_size = config->buffer_size;
if (buffer_size <= 0) {
buffer_size = WEBSOCKET_BUFFER_SIZE_BYTE;
}
client->rx_buffer = malloc(buffer_size);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->rx_buffer, {
goto _websocket_init_fail;
});
client->tx_buffer = malloc(buffer_size);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->tx_buffer, {
goto _websocket_init_fail;
});
client->status_bits = xEventGroupCreate();
ESP_WS_CLIENT_MEM_CHECK(TAG, client->status_bits, {
goto _websocket_init_fail;
});
client->buffer_size = buffer_size;
return client;
_websocket_init_fail:
esp_websocket_client_destroy(client);
return NULL;
}
esp_err_t esp_websocket_client_destroy(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (client->run) {
esp_websocket_client_stop(client);
}
if (client->event_handle) {
esp_event_loop_delete(client->event_handle);
}
esp_websocket_client_destroy_config(client);
esp_transport_list_destroy(client->transport_list);
vQueueDelete(client->lock);
free(client->tx_buffer);
free(client->rx_buffer);
if (client->status_bits) {
vEventGroupDelete(client->status_bits);
}
free(client);
client = NULL;
return ESP_OK;
}
esp_err_t esp_websocket_client_set_uri(esp_websocket_client_handle_t client, const char *uri)
{
if (client == NULL || uri == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct http_parser_url puri;
http_parser_url_init(&puri);
int parser_status = http_parser_parse_url(uri, strlen(uri), 0, &puri);
if (parser_status != 0) {
ESP_LOGE(TAG, "Error parse uri = %s", uri);
return ESP_FAIL;
}
if (puri.field_data[UF_SCHEMA].len) {
free(client->config->scheme);
asprintf(&client->config->scheme, "%.*s", puri.field_data[UF_SCHEMA].len, uri + puri.field_data[UF_SCHEMA].off);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, return ESP_ERR_NO_MEM);
}
if (puri.field_data[UF_HOST].len) {
free(client->config->host);
asprintf(&client->config->host, "%.*s", puri.field_data[UF_HOST].len, uri + puri.field_data[UF_HOST].off);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->host, return ESP_ERR_NO_MEM);
}
if (puri.field_data[UF_PATH].len || puri.field_data[UF_QUERY].len) {
free(client->config->path);
if (puri.field_data[UF_QUERY].len == 0) {
asprintf(&client->config->path, "%.*s", puri.field_data[UF_PATH].len, uri + puri.field_data[UF_PATH].off);
} else if (puri.field_data[UF_PATH].len == 0) {
asprintf(&client->config->path, "/?%.*s", puri.field_data[UF_QUERY].len, uri + puri.field_data[UF_QUERY].off);
} else {
asprintf(&client->config->path, "%.*s?%.*s", puri.field_data[UF_PATH].len, uri + puri.field_data[UF_PATH].off,
puri.field_data[UF_QUERY].len, uri + puri.field_data[UF_QUERY].off);
}
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->path, return ESP_ERR_NO_MEM);
}
if (puri.field_data[UF_PORT].off) {
client->config->port = strtol((const char*)(uri + puri.field_data[UF_PORT].off), NULL, 10);
}
if (puri.field_data[UF_USERINFO].len) {
char *user_info = NULL;
asprintf(&user_info, "%.*s", puri.field_data[UF_USERINFO].len, uri + puri.field_data[UF_USERINFO].off);
if (user_info) {
char *pass = strchr(user_info, ':');
if (pass) {
pass[0] = 0; //terminal username
pass ++;
free(client->config->password);
client->config->password = strdup(pass);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->password, return ESP_ERR_NO_MEM);
}
free(client->config->username);
client->config->username = strdup(user_info);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->username, return ESP_ERR_NO_MEM);
free(user_info);
} else {
return ESP_ERR_NO_MEM;
}
}
return ESP_OK;
}
static void esp_websocket_client_task(void *pv)
{
const int lock_timeout = portMAX_DELAY;
int rlen;
esp_websocket_client_handle_t client = (esp_websocket_client_handle_t) pv;
client->run = true;
//get transport by scheme
client->transport = esp_transport_list_get_transport(client->transport_list, client->config->scheme);
if (client->transport == NULL) {
ESP_LOGE(TAG, "There are no transports valid, stop websocket client");
client->run = false;
}
//default port
if (client->config->port == 0) {
client->config->port = esp_transport_get_default_port(client->transport);
}
client->state = WEBSOCKET_STATE_INIT;
xEventGroupClearBits(client->status_bits, STOPPED_BIT);
int read_select = 0;
while (client->run) {
if (xSemaphoreTakeRecursive(client->lock, lock_timeout) != pdPASS) {
ESP_LOGE(TAG, "Failed to lock ws-client tasks, exitting the task...");
break;
}
switch ((int)client->state) {
case WEBSOCKET_STATE_INIT:
if (client->transport == NULL) {
ESP_LOGE(TAG, "There are no transport");
client->run = false;
break;
}
if (esp_transport_connect(client->transport,
client->config->host,
client->config->port,
client->config->network_timeout_ms) < 0) {
ESP_LOGE(TAG, "Error transport connect");
esp_websocket_client_abort_connection(client);
break;
}
ESP_LOGD(TAG, "Transport connected to %s://%s:%d", client->config->scheme, client->config->host, client->config->port);
client->state = WEBSOCKET_STATE_CONNECTED;
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_CONNECTED, NULL, 0);
break;
case WEBSOCKET_STATE_CONNECTED:
if (_tick_get_ms() - client->ping_tick_ms > WEBSOCKET_PING_TIMEOUT_MS) {
client->ping_tick_ms = _tick_get_ms();
ESP_LOGD(TAG, "Sending PING...");
esp_transport_ws_send_raw(client->transport, WS_TRANSPORT_OPCODES_PING, NULL, 0, client->config->network_timeout_ms);
}
if (read_select == 0) {
ESP_LOGV(TAG, "Read poll timeout: skipping esp_transport_read()...");
break;
}
client->ping_tick_ms = _tick_get_ms();
rlen = esp_transport_read(client->transport, client->rx_buffer, client->buffer_size, client->config->network_timeout_ms);
if (rlen < 0) {
ESP_LOGE(TAG, "Error read data");
esp_websocket_client_abort_connection(client);
break;
}
if (rlen >= 0) {
client->last_opcode = esp_transport_ws_get_read_opcode(client->transport);
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_DATA, client->rx_buffer, rlen);
// if a PING message received -> send out the PONG
if (client->last_opcode == WS_TRANSPORT_OPCODES_PING) {
const char *data = (rlen == 0) ? NULL : client->rx_buffer;
esp_transport_ws_send_raw(client->transport, WS_TRANSPORT_OPCODES_PONG, data, rlen,
client->config->network_timeout_ms);
}
}
break;
case WEBSOCKET_STATE_WAIT_TIMEOUT:
if (!client->config->auto_reconnect) {
client->run = false;
break;
}
if (_tick_get_ms() - client->reconnect_tick_ms > client->wait_timeout_ms) {
client->state = WEBSOCKET_STATE_INIT;
client->reconnect_tick_ms = _tick_get_ms();
ESP_LOGD(TAG, "Reconnecting...");
}
break;
}
xSemaphoreGiveRecursive(client->lock);
if (WEBSOCKET_STATE_CONNECTED == client->state) {
read_select = esp_transport_poll_read(client->transport, 1000); //Poll every 1000ms
if (read_select < 0) {
ESP_LOGE(TAG, "Network error: esp_transport_poll_read() returned %d, errno=%d", read_select, errno);
esp_websocket_client_abort_connection(client);
}
} else if (WEBSOCKET_STATE_WAIT_TIMEOUT == client->state) {
// waiting for reconnecting...
vTaskDelay(client->wait_timeout_ms / 2 / portTICK_RATE_MS);
}
}
esp_transport_close(client->transport);
xEventGroupSetBits(client->status_bits, STOPPED_BIT);
client->state = WEBSOCKET_STATE_UNKNOW;
vTaskDelete(NULL);
}
esp_err_t esp_websocket_client_start(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (client->state >= WEBSOCKET_STATE_INIT) {
ESP_LOGE(TAG, "The client has started");
return ESP_FAIL;
}
if (xTaskCreate(esp_websocket_client_task, "websocket_task", client->config->task_stack, client, client->config->task_prio, NULL) != pdTRUE) {
ESP_LOGE(TAG, "Error create websocket task");
return ESP_FAIL;
}
xEventGroupClearBits(client->status_bits, STOPPED_BIT);
return ESP_OK;
}
esp_err_t esp_websocket_client_stop(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (!client->run) {
ESP_LOGW(TAG, "Client was not started");
return ESP_FAIL;
}
client->run = false;
xEventGroupWaitBits(client->status_bits, STOPPED_BIT, false, true, portMAX_DELAY);
client->state = WEBSOCKET_STATE_UNKNOW;
return ESP_OK;
}
static int esp_websocket_client_send_with_opcode(esp_websocket_client_handle_t client, ws_transport_opcodes_t opcode, const char *data, int len, TickType_t timeout);
int esp_websocket_client_send_text(esp_websocket_client_handle_t client, const char *data, int len, TickType_t timeout)
{
return esp_websocket_client_send_with_opcode(client, WS_TRANSPORT_OPCODES_TEXT, data, len, timeout);
}
int esp_websocket_client_send(esp_websocket_client_handle_t client, const char *data, int len, TickType_t timeout)
{
return esp_websocket_client_send_with_opcode(client, WS_TRANSPORT_OPCODES_BINARY, data, len, timeout);
}
int esp_websocket_client_send_bin(esp_websocket_client_handle_t client, const char *data, int len, TickType_t timeout)
{
return esp_websocket_client_send_with_opcode(client, WS_TRANSPORT_OPCODES_BINARY, data, len, timeout);
}
static int esp_websocket_client_send_with_opcode(esp_websocket_client_handle_t client, ws_transport_opcodes_t opcode, const char *data, int len, TickType_t timeout)
{
int need_write = len;
int wlen = 0, widx = 0;
int ret = ESP_FAIL;
if (client == NULL || data == NULL || len <= 0) {
ESP_LOGE(TAG, "Invalid arguments");
return ESP_FAIL;
}
if (xSemaphoreTakeRecursive(client->lock, timeout) != pdPASS) {
ESP_LOGE(TAG, "Could not lock ws-client within %d timeout", timeout);
return ESP_FAIL;
}
if (!esp_websocket_client_is_connected(client)) {
ESP_LOGE(TAG, "Websocket client is not connected");
goto unlock_and_return;
}
if (client->transport == NULL) {
ESP_LOGE(TAG, "Invalid transport");
goto unlock_and_return;
}
while (widx < len) {
if (need_write > client->buffer_size) {
need_write = client->buffer_size;
}
memcpy(client->tx_buffer, data + widx, need_write);
// send with ws specific way and specific opcode
wlen = esp_transport_ws_send_raw(client->transport, opcode, (char *)client->tx_buffer, need_write,
(timeout==portMAX_DELAY)? -1 : timeout * portTICK_PERIOD_MS);
if (wlen <= 0) {
ret = wlen;
ESP_LOGE(TAG, "Network error: esp_transport_write() returned %d, errno=%d", ret, errno);
goto unlock_and_return;
}
widx += wlen;
need_write = len - widx;
}
ret = widx;
unlock_and_return:
xSemaphoreGiveRecursive(client->lock);
return ret;
}
bool esp_websocket_client_is_connected(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return false;
}
return client->state == WEBSOCKET_STATE_CONNECTED;
}
esp_err_t esp_websocket_register_events(esp_websocket_client_handle_t client,
esp_websocket_event_id_t event,
esp_event_handler_t event_handler,
void* event_handler_arg) {
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
return esp_event_handler_register_with(client->event_handle, WEBSOCKET_EVENTS, event, event_handler, event_handler_arg);
}
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