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// SPDX-License-Identifier: GPL-3.0-or-later
#include "common_public.h"
#define MQTT_NG_MSGGEN_OK 0
// MQTT_NG_MSGGEN_USER_ERROR means parameters given to this function
// do not make sense or are out of MQTT specs
#define MQTT_NG_MSGGEN_USER_ERROR 1
#define MQTT_NG_MSGGEN_BUFFER_OOM 2
#define MQTT_NG_MSGGEN_MSG_TOO_BIG 3
struct mqtt_ng_client;
extern time_t ping_timeout;
/* Converts integer to MQTT Variable Byte Integer as per 1.5.5 of MQTT 5 specs
* @param input value to be converted
* @param output pointer to memory where output will be written to. Must allow up to 4 bytes to be written.
* @return number of bytes written to output or <= 0 if error in which case contents of output are undefined
*/
int uint32_to_mqtt_vbi(uint32_t input, unsigned char *output);
struct mqtt_lwt_properties {
char *will_topic;
free_fnc_t will_topic_free;
void *will_message;
free_fnc_t will_message_free;
size_t will_message_size;
int will_qos;
int will_retain;
};
struct mqtt_auth_properties {
char *client_id;
free_fnc_t client_id_free;
char *username;
free_fnc_t username_free;
char *password;
free_fnc_t password_free;
};
int mqtt_ng_connect(struct mqtt_ng_client *client,
struct mqtt_auth_properties *auth,
struct mqtt_lwt_properties *lwt,
uint8_t clean_start,
uint16_t keep_alive);
int mqtt_ng_publish(struct mqtt_ng_client *client,
char *topic,
free_fnc_t topic_free,
void *msg,
free_fnc_t msg_free,
size_t msg_len,
uint8_t publish_flags,
uint16_t *packet_id);
struct mqtt_sub {
char *topic;
free_fnc_t topic_free;
uint8_t options;
};
int mqtt_ng_subscribe(struct mqtt_ng_client *client, struct mqtt_sub *subscriptions, size_t subscription_count);
int mqtt_ng_ping(struct mqtt_ng_client *client);
typedef ssize_t (*mqtt_ng_send_fnc_t)(void *user_ctx, const void* buf, size_t len);
struct mqtt_ng_init {
rbuf_t data_in;
mqtt_ng_send_fnc_t data_out_fnc;
void *user_ctx;
void (*puback_callback)(uint16_t packet_id);
void (*connack_callback)(void* user_ctx, int connack_reply);
void (*msg_callback)(const char *topic, const void *msg, size_t msglen, int qos);
};
struct mqtt_ng_client *mqtt_ng_init(struct mqtt_ng_init *settings);
void mqtt_ng_destroy(struct mqtt_ng_client *client);
int mqtt_ng_disconnect(struct mqtt_ng_client *client, uint8_t reason_code);
int mqtt_ng_sync(struct mqtt_ng_client *client);
time_t mqtt_ng_last_send_time(struct mqtt_ng_client *client);
void mqtt_ng_set_max_mem(struct mqtt_ng_client *client, size_t bytes);
void mqtt_ng_get_stats(struct mqtt_ng_client *client, struct mqtt_ng_stats *stats);
int mqtt_ng_set_topic_alias(struct mqtt_ng_client *client, const char *topic);
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