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105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/**
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* @file
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* MQTT client (private interface)
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*/
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/*
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* Copyright (c) 2016 Erik Andersson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Erik Andersson
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*
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*/
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#ifndef LWIP_HDR_APPS_MQTT_PRIV_H
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#define LWIP_HDR_APPS_MQTT_PRIV_H
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#include "lwip/apps/mqtt.h"
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#include "lwip/altcp.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Pending request item, binds application callback to pending server requests */
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struct mqtt_request_t
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{
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/** Next item in list, NULL means this is the last in chain,
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next pointing at itself means request is unallocated */
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struct mqtt_request_t *next;
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/** Callback to upper layer */
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mqtt_request_cb_t cb;
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void *arg;
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/** MQTT packet identifier */
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u16_t pkt_id;
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/** Expire time relative to element before this */
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u16_t timeout_diff;
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};
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/** Ring buffer */
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struct mqtt_ringbuf_t {
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u16_t put;
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u16_t get;
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u8_t buf[MQTT_OUTPUT_RINGBUF_SIZE];
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};
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/** MQTT client */
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struct mqtt_client_s
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{
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/** Timers and timeouts */
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u16_t cyclic_tick;
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u16_t keep_alive;
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u16_t server_watchdog;
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/** Packet identifier generator*/
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u16_t pkt_id_seq;
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/** Packet identifier of pending incoming publish */
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u16_t inpub_pkt_id;
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/** Connection state */
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u8_t conn_state;
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struct altcp_pcb *conn;
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/** Connection callback */
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void *connect_arg;
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mqtt_connection_cb_t connect_cb;
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/** Pending requests to server */
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struct mqtt_request_t *pend_req_queue;
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struct mqtt_request_t req_list[MQTT_REQ_MAX_IN_FLIGHT];
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void *inpub_arg;
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/** Incoming data callback */
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mqtt_incoming_data_cb_t data_cb;
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mqtt_incoming_publish_cb_t pub_cb;
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/** Input */
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u32_t msg_idx;
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u8_t rx_buffer[MQTT_VAR_HEADER_BUFFER_LEN];
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/** Output ring-buffer */
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struct mqtt_ringbuf_t output;
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_HDR_APPS_MQTT_PRIV_H */
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