MQTT client. More...

Enumerations
enum
	MQTT client connection states. More...
enum	mqtt_message_type
	MQTT control message types. More...
enum	mqtt_connect_flag
	MQTT connect flags, only used in CONNECT message. More...
Functions
static void	mqtt_cyclic_timer (void *arg)
	Interval timer, called every MQTT_CYCLIC_TIMER_INTERVAL seconds in MQTT_CONNECTING and MQTT_CONNECTED states.
static const char *	mqtt_msg_type_to_str (u8_t msg_type)
	Message type value to string.
static u16_t	msg_generate_packet_id (mqtt_client_t *client)
	Generate MQTT packet identifier.
static void	mqtt_output_send (struct mqtt_ringbuf_t rb, struct tcp_pcb tpcb)
	Try send as many bytes as possible from output ring buffer.
static struct mqtt_request_t *	mqtt_create_request (struct mqtt_request_t r_objs, u16_t pkt_id, mqtt_request_cb_t cb, void arg)
	Create request item.
static void	mqtt_append_request (struct mqtt_request_t *tail, struct mqtt_request_t r)
	Append request to pending request queue.
static void	mqtt_delete_request (struct mqtt_request_t *r)
	Delete request item.
static struct mqtt_request_t *	mqtt_take_request (struct mqtt_request_t **tail, u16_t pkt_id)
	Remove a request item with a specific packet identifier from request queue.
static void	mqtt_request_time_elapsed (struct mqtt_request_t **tail, u8_t t)
	Handle requests timeout.
static void	mqtt_clear_requests (struct mqtt_request_t **tail)
	Free all request items.
static void	mqtt_init_requests (struct mqtt_request_t *r_objs)
	Initialize all request items.
static void	mqtt_output_append_fixed_header (struct mqtt_ringbuf_t *rb, u8_t msg_type, u8_t dup, u8_t qos, u8_t retain, u16_t r_length)
	Append fixed header.
static u8_t	mqtt_output_check_space (struct mqtt_ringbuf_t *rb, u16_t r_length)
	Check output buffer space.
static void	mqtt_close (mqtt_client_t *client, mqtt_connection_status_t reason)
	Close connection to server.
static err_t	pub_ack_rec_rel_response (mqtt_client_t *client, u8_t msg, u16_t pkt_id, u8_t qos)
	Send PUBACK, PUBREC or PUBREL response message.
static void	mqtt_incomming_suback (struct mqtt_request_t *r, u8_t result)
	Subscribe response from server.
static mqtt_connection_status_t	mqtt_message_received (mqtt_client_t *client, u8_t fixed_hdr_idx, u16_t length, u32_t remaining_length)
	Complete MQTT message received or buffer full.
static mqtt_connection_status_t	mqtt_parse_incoming (mqtt_client_t client, struct pbuf p)
	MQTT incoming message parser.
static err_t	mqtt_tcp_recv_cb (void arg, struct tcp_pcb pcb, struct pbuf *p, err_t err)
	TCP received callback function.
static err_t	mqtt_tcp_sent_cb (void arg, struct tcp_pcb tpcb, u16_t len)
	TCP data sent callback function.
static void	mqtt_tcp_err_cb (void *arg, err_t err)
	TCP error callback function.
static err_t	mqtt_tcp_poll_cb (void arg, struct tcp_pcb tpcb)
	TCP poll callback function.
static err_t	mqtt_tcp_connect_cb (void arg, struct tcp_pcb tpcb, err_t err)
	TCP connect callback function.
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)
	MQTT publish function.
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)
	MQTT subscribe/unsubscribe function.
void	mqtt_set_inpub_callback (mqtt_client_t client, mqtt_incoming_publish_cb_t pub_cb, mqtt_incoming_data_cb_t data_cb, void arg)
	Set callback to handle incoming publish requests from server.
mqtt_client_t *	mqtt_client_new (void)
	Create a new MQTT client instance.
err_t	mqtt_client_connect (mqtt_client_t client, const ip_addr_t ip_addr, u16_t port, mqtt_connection_cb_t cb, void arg, const struct mqtt_connect_client_info_t client_info)
	Connect to MQTT server.
void	mqtt_disconnect (mqtt_client_t *client)
	Disconnect from MQTT server.
u8_t	mqtt_client_is_connected (mqtt_client_t *client)
	Check connection with server.

Detailed Description

MQTT client.

Definition in file lwip_mqtt.c.

Enumeration Type Documentation

anonymous enum

MQTT client connection states.

Definition at line 79 of file lwip_mqtt.c.

enum mqtt_connect_flag

MQTT connect flags, only used in CONNECT message.

Definition at line 113 of file lwip_mqtt.c.

enum mqtt_message_type

MQTT control message types.

Definition at line 89 of file lwip_mqtt.c.

Function Documentation

static void mqtt_append_request	(	struct mqtt_request_t **	tail,
		struct mqtt_request_t *	r
	)		`[static]`

Append request to pending request queue.

Parameters:

tail	Pointer to request queue tail pointer
r	Request to append

Definition at line 283 of file lwip_mqtt.c.

static void mqtt_clear_requests ( struct mqtt_request_t ** tail ) [static]

Free all request items.

Parameters:

tail	Pointer to request queue tail pointer

Definition at line 389 of file lwip_mqtt.c.

static void mqtt_close	(	mqtt_client_t *	client,
		mqtt_connection_status_t	reason
	)		`[static]`

Close connection to server.

Parameters:

client	MQTT client
reason	Reason for disconnection

Definition at line 505 of file lwip_mqtt.c.

static struct mqtt_request_t* mqtt_create_request	(	struct mqtt_request_t *	r_objs,
		u16_t	pkt_id,
		mqtt_request_cb_t	cb,
		void *	arg
	)		`[static, read]`

Create request item.

Parameters:

r_objs	Pointer to request objects
pkt_id	Packet identifier of request
cb	Packet callback to call when requests lifetime ends
arg	Parameter following callback

Returns:: Request or NULL if failed to create

Definition at line 257 of file lwip_mqtt.c.

static void mqtt_cyclic_timer ( void * arg ) [static]

Interval timer, called every MQTT_CYCLIC_TIMER_INTERVAL seconds in MQTT_CONNECTING and MQTT_CONNECTED states.

Parameters:

arg	MQTT client

Definition at line 544 of file lwip_mqtt.c.

static void mqtt_delete_request ( struct mqtt_request_t * r ) [static]

Delete request item.

Parameters:

r	Request item to delete

Definition at line 312 of file lwip_mqtt.c.

static void mqtt_incomming_suback	(	struct mqtt_request_t *	r,
		u8_t	result
	)		`[static]`

Subscribe response from server.

Parameters:

r	Matching request
result	Result code from server

Definition at line 624 of file lwip_mqtt.c.

static void mqtt_init_requests ( struct mqtt_request_t * r_objs ) [static]

Initialize all request items.

Parameters:

r_objs Pointer to request objects

Definition at line 404 of file lwip_mqtt.c.

static mqtt_connection_status_t mqtt_message_received	(	mqtt_client_t *	client,
		u8_t	fixed_hdr_idx,
		u16_t	length,
		u32_t	remaining_length
	)		`[static]`

Complete MQTT message received or buffer full.

Parameters:

client	MQTT client
fixed_hdr_idx	header index
length	length received part
remaining_length	Remaining length of complete message

Definition at line 640 of file lwip_mqtt.c.

static const char* mqtt_msg_type_to_str ( u8_t msg_type ) [static]

Message type value to string.

Parameters:

msg_type see enum mqtt_message_type

Returns:: Control message type text string

Definition at line 149 of file lwip_mqtt.c.

static void mqtt_output_append_fixed_header	(	struct mqtt_ringbuf_t *	rb,
		u8_t	msg_type,
		u8_t	dup,
		u8_t	qos,
		u8_t	retain,
		u16_t	r_length
	)		`[static]`

Append fixed header.

Parameters:

rb	Output ring buffer
msg_type	see enum mqtt_message_type
dup	MQTT DUP flag
qos	MQTT QoS field
retain	MQTT retain flag
r_length	Remaining length after fixed header

Definition at line 462 of file lwip_mqtt.c.

static u8_t mqtt_output_check_space	(	struct mqtt_ringbuf_t *	rb,
		u16_t	r_length
	)		`[static]`

Check output buffer space.

Parameters:

rb	Output ring buffer
r_length	Remaining length after fixed header

Returns:: 1 if message will fit, 0 if not enough buffer space

Definition at line 482 of file lwip_mqtt.c.

static void mqtt_output_send	(	struct mqtt_ringbuf_t *	rb,
		struct tcp_pcb *	tpcb
	)		`[static]`

Try send as many bytes as possible from output ring buffer.

Parameters:

rb	Output ring buffer
tpcb	TCP connection handle

Definition at line 205 of file lwip_mqtt.c.

static mqtt_connection_status_t mqtt_parse_incoming	(	mqtt_client_t *	client,
		struct pbuf *	p
	)		`[static]`

MQTT incoming message parser.

Parameters:

client	MQTT client
p	PBUF chain of received data

Returns:: Connection status

Definition at line 778 of file lwip_mqtt.c.

static void mqtt_request_time_elapsed	(	struct mqtt_request_t **	tail,
		u8_t	t
	)		`[static]`

Handle requests timeout.

Parameters:

tail	Pointer to request queue tail pointer
t	Time since last call in seconds

Definition at line 361 of file lwip_mqtt.c.

static struct mqtt_request_t* mqtt_take_request	(	struct mqtt_request_t **	tail,
		u16_t	pkt_id
	)		`[static, read]`

Remove a request item with a specific packet identifier from request queue.

Parameters:

tail	Pointer to request queue tail pointer
pkt_id	Packet identifier of request to take

Returns:: Request item if found, NULL if not

Definition at line 326 of file lwip_mqtt.c.

static err_t mqtt_tcp_connect_cb	(	void *	arg,
		struct tcp_pcb *	tpcb,
		err_t	err
	)		`[static]`

TCP connect callback function.

See also:: tcp_connected_fn

Parameters:

arg	MQTT client
err	Always ERR_OK, mqtt_tcp_err_cb is called in case of error

Returns:: ERR_OK

Definition at line 971 of file lwip_mqtt.c.

static void mqtt_tcp_err_cb	(	void *	arg,
		err_t	err
	)		`[static]`

TCP error callback function.

See also:: tcp_err_fn

Parameters:

arg	MQTT client
err	Error encountered

Definition at line 936 of file lwip_mqtt.c.

static err_t mqtt_tcp_poll_cb	(	void *	arg,
		struct tcp_pcb *	tpcb
	)		`[static]`

TCP poll callback function.

See also:: tcp_poll_fn

Parameters:

arg	MQTT client
tpcb	TCP connection handle

Returns:: err ERR_OK

Definition at line 954 of file lwip_mqtt.c.

static err_t mqtt_tcp_recv_cb	(	void *	arg,
		struct tcp_pcb *	pcb,
		struct pbuf *	p,
		err_t	err
	)		`[static]`

TCP received callback function.

See also:: tcp_recv_fn

Parameters:

arg	MQTT client
p	PBUF chain of received data
err	Passed as return value if not ERR_OK

Returns:: ERR_OK or err passed into callback

Definition at line 859 of file lwip_mqtt.c.

static err_t mqtt_tcp_sent_cb	(	void *	arg,
		struct tcp_pcb *	tpcb,
		u16_t	len
	)		`[static]`

TCP data sent callback function.

See also:: tcp_sent_fn

Parameters:

arg	MQTT client
tpcb	TCP connection handle
len	Number of bytes sent

Returns:: ERR_OK

Definition at line 903 of file lwip_mqtt.c.

static u16_t msg_generate_packet_id ( mqtt_client_t * client ) [static]

Generate MQTT packet identifier.

Parameters:

client MQTT client

Returns:: New packet identifier, range 1 to 65535

Definition at line 166 of file lwip_mqtt.c.

static err_t pub_ack_rec_rel_response	(	mqtt_client_t *	client,
		u8_t	msg,
		u16_t	pkt_id,
		u8_t	qos
	)		`[static]`

Send PUBACK, PUBREC or PUBREL response message.

Parameters:

client	MQTT client
msg	PUBACK, PUBREC or PUBREL
pkt_id	Packet identifier
qos	QoS value

Returns:: ERR_OK if successful, ERR_MEM if out of memory

Definition at line 603 of file lwip_mqtt.c.

Type:	Program
Created:	01 May 2018
Imports:	1
Forks:	0
Commits:	3
Dependents:	0
Dependencies:	0
Followers:	4

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