BadVPN – Rev 1
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/**
* @file
* MQTT client
*/
/*
* Copyright (c) 2016 Erik Andersson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Erik Andersson
*
*/
#ifndef LWIP_HDR_APPS_MQTT_CLIENT_H
#define LWIP_HDR_APPS_MQTT_CLIENT_H
#include "lwip/apps/mqtt_opts.h"
#include "lwip/err.h"
#include "lwip/ip_addr.h"
#include "lwip/prot/iana.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct mqtt_client_s mqtt_client_t;
#if LWIP_ALTCP && LWIP_ALTCP_TLS
struct altcp_tls_config;
#endif
/** @ingroup mqtt
* Default MQTT port (non-TLS) */
#define MQTT_PORT LWIP_IANA_PORT_MQTT
/** @ingroup mqtt
* Default MQTT TLS port */
#define MQTT_TLS_PORT LWIP_IANA_PORT_SEQURE_MQTT
/*---------------------------------------------------------------------------------------------- */
/* Connection with server */
/**
* @ingroup mqtt
* Client information and connection parameters */
struct mqtt_connect_client_info_t {
/** Client identifier, must be set by caller */
const char *client_id;
/** User name, set to NULL if not used */
const char* client_user;
/** Password, set to NULL if not used */
const char* client_pass;
/** keep alive time in seconds, 0 to disable keep alive functionality*/
u16_t keep_alive;
/** will topic, set to NULL if will is not to be used,
will_msg, will_qos and will retain are then ignored */
const char* will_topic;
/** will_msg, see will_topic */
const char* will_msg;
/** will_qos, see will_topic */
u8_t will_qos;
/** will_retain, see will_topic */
u8_t will_retain;
#if LWIP_ALTCP && LWIP_ALTCP_TLS
/** TLS configuration for secure connections */
struct altcp_tls_config *tls_config;
#endif
};
/**
* @ingroup mqtt
* Connection status codes */
typedef enum
{
/** Accepted */
MQTT_CONNECT_ACCEPTED = 0,
/** Refused protocol version */
MQTT_CONNECT_REFUSED_PROTOCOL_VERSION = 1,
/** Refused identifier */
MQTT_CONNECT_REFUSED_IDENTIFIER = 2,
/** Refused server */
MQTT_CONNECT_REFUSED_SERVER = 3,
/** Refused user credentials */
MQTT_CONNECT_REFUSED_USERNAME_PASS = 4,
/** Refused not authorized */
MQTT_CONNECT_REFUSED_NOT_AUTHORIZED_ = 5,
/** Disconnected */
MQTT_CONNECT_DISCONNECTED = 256,
/** Timeout */
MQTT_CONNECT_TIMEOUT = 257
} mqtt_connection_status_t;
/**
* @ingroup mqtt
* Function prototype for mqtt connection status callback. Called when
* client has connected to the server after initiating a mqtt connection attempt by
* calling mqtt_connect() or when connection is closed by server or an error
*
* @param client MQTT client itself
* @param arg Additional argument to pass to the callback function
* @param status Connect result code or disconnection notification @see mqtt_connection_status_t
*
*/
typedef void (*mqtt_connection_cb_t)(mqtt_client_t *client, void *arg, mqtt_connection_status_t status);
/**
* @ingroup mqtt
* Data callback flags */
enum {
/** Flag set when last fragment of data arrives in data callback */
MQTT_DATA_FLAG_LAST = 1
};
/**
* @ingroup mqtt
* Function prototype for MQTT incoming publish data callback function. Called when data
* arrives to a subscribed topic @see mqtt_subscribe
*
* @param arg Additional argument to pass to the callback function
* @param data User data, pointed object, data may not be referenced after callback return,
NULL is passed when all publish data are delivered
* @param len Length of publish data fragment
* @param flags MQTT_DATA_FLAG_LAST set when this call contains the last part of data from publish message
*
*/
typedef void (*mqtt_incoming_data_cb_t)(void *arg, const u8_t *data, u16_t len, u8_t flags);
/**
* @ingroup mqtt
* Function prototype for MQTT incoming publish function. Called when an incoming publish
* arrives to a subscribed topic @see mqtt_subscribe
*
* @param arg Additional argument to pass to the callback function
* @param topic Zero terminated Topic text string, topic may not be referenced after callback return
* @param tot_len Total length of publish data, if set to 0 (no publish payload) data callback will not be invoked
*/
typedef void (*mqtt_incoming_publish_cb_t)(void *arg, const char *topic, u32_t tot_len);
/**
* @ingroup mqtt
* Function prototype for mqtt request callback. Called when a subscribe, unsubscribe
* or publish request has completed
* @param arg Pointer to user data supplied when invoking request
* @param err ERR_OK on success
* ERR_TIMEOUT if no response was received within timeout,
* ERR_ABRT if (un)subscribe was denied
*/
typedef void (*mqtt_request_cb_t)(void *arg, err_t err);
/** Connect to server */
err_t mqtt_client_connect(mqtt_client_t *client, const ip_addr_t *ipaddr, u16_t port, mqtt_connection_cb_t cb, void *arg,
const struct mqtt_connect_client_info_t *client_info);
/** Disconnect from server */
void mqtt_disconnect(mqtt_client_t *client);
mqtt_client_t *mqtt_client_new(void);
void mqtt_client_free(mqtt_client_t* client);
/** Check connection status */
u8_t mqtt_client_is_connected(mqtt_client_t *client);
/** Set callback to call for incoming publish */
void mqtt_set_inpub_callback(mqtt_client_t *client, mqtt_incoming_publish_cb_t,
mqtt_incoming_data_cb_t data_cb, void *arg);
/** Common function for subscribe and unsubscribe */
err_t mqtt_sub_unsub(mqtt_client_t *client, const char *topic, u8_t qos, mqtt_request_cb_t cb, void *arg, u8_t sub);
/** @ingroup mqtt
*Subscribe to topic */
#define mqtt_subscribe(client, topic, qos, cb, arg) mqtt_sub_unsub(client, topic, qos, cb, arg, 1)
/** @ingroup mqtt
* Unsubscribe to topic */
#define mqtt_unsubscribe(client, topic, cb, arg) mqtt_sub_unsub(client, topic, 0, cb, arg, 0)
/** Publish data to topic */
err_t mqtt_publish(mqtt_client_t *client, const char *topic, const void *payload, u16_t payload_length, u8_t qos, u8_t retain,
mqtt_request_cb_t cb, void *arg);
#ifdef __cplusplus
}
#endif
#endif /* LWIP_HDR_APPS_MQTT_CLIENT_H */