#ifndef __MQTT_INSTANCE_H__
#define __MQTT_INSTANCE_H__

enum {
    MQTT_INSTANCE_EVENT_DISCONNECTED = 0,
    MQTT_INSTANCE_EVENT_CONNECTED    = 1,
    MQTT_INSTANCE_EVENT_PING_RESP    = 2,
};


/**
 * @brief   Get the mqtt singleton instance.
 *
 * @param None
 *
 * @retval NULL : failed
 * @retval NOT_NULL : The singleton instance of mqtt client.
 * @see None.
 */
void *mqtt_get_instance();


/**
 * @brief   Remove the mqtt singleton instance.
 *
 * @param None
 *
 * @retval None
 * @see None.
 */
void mqtt_remove_instance();


/**
 * @brief   Set the mqtt singleton instance.
 *
 * @param None
 *
 * @retval -1:
 * @retval  0:
 * @see None.
 */
int mqtt_set_instance(void* mqtt_t);

int mqtt_init_instance_poka2(char* host,int port,char *client, char *user, char *password, int maxMsgSize);

int mqtt_init_instance_poka(char* host,int port,char *client, char *user, char *password, int maxMsgSize);
/**
 * @brief   Initialize the mqtt singleton instance.
 *
 * @param [in] productKey
 * @param [in] deviceName
 * @param [in] deviceSecret
 * @param [in] maxMsgSize: mqtt read/send buffer size
 *
 * @retval 1:  mqtt instance have been init
 * @retval 0:  mqtt instance init success
 *     IOT_MQTT_Construct success,  MQTT connected.
 * @retval -1: mqtt instance init fail
 * @see None.
 */
int mqtt_init_instance(char *productKey, char *deviceName, char *deviceSecret, int maxMsgSize);


/**
 * @brief   Deinitialize the mqtt singleton instance.
 *
 * 
 * @retval 0:  success
 * @retval -1: fail
 * @see None.
 */
int mqtt_deinit_instance();


/**
 * @brief   Set mqtt event callback.
 *
 * @param [in] event callback
 * @param [in] user data
 * 
 * @retval 0:  success
 * @retval -1: fail
 * @see None.
 */
int mqtt_set_event_cb(void (*event)(int event, void *ctx), void *ctx);


/**
 * @brief   Subscribe topic.
 *
 * @param [in] topic
 * @param [in] callback
 * @param [in] user data
 * 
 * @retval 0:  success
 * @retval -1: fail
 * @see None.
 */
int mqtt_subscribe(char *topic, void (*cb)(char *topic, int topic_len, void *payload, int payload_len, void *ctx), void *ctx);


/**
 * @brief   Unsubscribe topic.
 *
 * @param [in] topic
 * 
 * @retval 0:  success
 * @retval -1: fail
 * @see None.
 */
int mqtt_unsubscribe(char *topic);


/**
 * @brief   Publish packet.
 *
 * @param [in] topic
 * @param [in] qos
 * @param [in] payload data
 * @param [in] payload data length
 * 
 * @retval 0:  success
 * @retval -1: fail
 * @see None.
 */
int mqtt_publish(char *topic, int qos, void *data, int len);

#endif /* __MQTT_INSTANCE_H__ */