esp-mqtt/include/mqtt_client.h

#ifndef _MQTT_CLIENT_H_
#define _MQTT_CLIENT_H_

#include <stdint.h>
#include <stdbool.h>
#include <string.h>

#include "mqtt_config.h"


typedef struct esp_mqtt_client* esp_mqtt_client_handle_t;


typedef enum {
    MQTT_EVENT_ERROR = 0,
    MQTT_EVENT_CONNECTED,
    MQTT_EVENT_DISCONNECTED,
    MQTT_EVENT_SUBSCRIBED,
    MQTT_EVENT_UNSUBSCRIBED,
    MQTT_EVENT_PUBLISHED,
    MQTT_EVENT_DATA,
} esp_mqtt_event_id_t;

typedef struct {
    esp_mqtt_event_id_t event_id;
    esp_mqtt_client_handle_t client;
    void *user_context;
    char *data;
    int data_len;
    char *topic;
    int topic_len;
    int msg_id;
} esp_mqtt_event_t;

typedef esp_mqtt_event_t* esp_mqtt_event_handle_t;


/**
 * \return True on connect success, false on error
 */
typedef esp_err_t (* mqtt_event_callback_t)(esp_mqtt_event_handle_t event);


typedef struct {
    mqtt_event_callback_t event_handle;
    char host[MQTT_MAX_HOST_LEN];
    char uri[MQTT_MAX_HOST_LEN];
    uint32_t port;
    char client_id[MQTT_MAX_CLIENT_LEN];
    char username[MQTT_MAX_USERNAME_LEN];
    char password[MQTT_MAX_PASSWORD_LEN];
    char lwt_topic[MQTT_MAX_LWT_TOPIC];
    char lwt_msg[MQTT_MAX_LWT_MSG];
    int lwt_qos;
    int lwt_retain;
    int disable_clean_session;
    int keepalive;
    bool disable_auto_reconnect;
    void *user_context;
    int task_prio;
    int task_stack;
    int buffer_size;
    const char *cert_pem;
} esp_mqtt_client_config_t;

esp_mqtt_client_handle_t esp_mqtt_client_init(const esp_mqtt_client_config_t *config);
esp_err_t esp_mqtt_client_set_uri(esp_mqtt_client_handle_t client, const char *uri);

esp_err_t esp_mqtt_client_start(esp_mqtt_client_handle_t client);
esp_err_t esp_mqtt_client_stop(esp_mqtt_client_handle_t client);
esp_err_t esp_mqtt_client_subscribe(esp_mqtt_client_handle_t client, const char *topic, int qos);
esp_err_t esp_mqtt_client_unsubscribe(esp_mqtt_client_handle_t client, const char *topic);
int esp_mqtt_client_publish(esp_mqtt_client_handle_t client, const char *topic, const char *data, int len, int qos, int retain);
esp_err_t esp_mqtt_client_destroy(esp_mqtt_client_handle_t client);

#endif