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    1: #ifndef HEADER_CURL_MQTT_H
    2: #define HEADER_CURL_MQTT_H
    3: /***************************************************************************
    4:  *                                  _   _ ____  _
    5:  *  Project                     ___| | | |  _ \| |
    6:  *                             / __| | | | |_) | |
    7:  *                            | (__| |_| |  _ <| |___
    8:  *                             \___|\___/|_| \_\_____|
    9:  *
   10:  * Copyright (C) 2019 - 2020, Björn Stenberg, <bjorn@haxx.se>
   11:  *
   12:  * This software is licensed as described in the file COPYING, which
   13:  * you should have received as part of this distribution. The terms
   14:  * are also available at https://curl.haxx.se/docs/copyright.html.
   15:  *
   16:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   17:  * copies of the Software, and permit persons to whom the Software is
   18:  * furnished to do so, under the terms of the COPYING file.
   19:  *
   20:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   21:  * KIND, either express or implied.
   22:  *
   23:  ***************************************************************************/
   24: 
   25: #ifdef CURL_ENABLE_MQTT
   26: extern const struct Curl_handler Curl_handler_mqtt;
   27: #endif
   28: 
   29: enum mqttstate {
   30:   MQTT_FIRST,             /* 0 */
   31:   MQTT_REMAINING_LENGTH,  /* 1 */
   32:   MQTT_CONNACK,           /* 2 */
   33:   MQTT_SUBACK,            /* 3 */
   34:   MQTT_SUBACK_COMING,     /* 4 - the SUBACK remainder */
   35:   MQTT_PUBWAIT,    /* 5 - wait for publish */
   36:   MQTT_PUB_REMAIN,  /* 6 - wait for the remainder of the publish */
   37: 
   38:   MQTT_NOSTATE /* 7 - never used an actual state */
   39: };
   40: 
   41: struct mqtt_conn {
   42:   enum mqttstate state;
   43:   enum mqttstate nextstate; /* switch to this after remaining length is
   44:                                done */
   45:   unsigned int packetid;
   46: };
   47: 
   48: /* protocol-specific transfer-related data */
   49: struct MQTT {
   50:   char *sendleftovers;
   51:   size_t nsend; /* size of sendleftovers */
   52: 
   53:   /* when receiving */
   54:   size_t npacket; /* byte counter */
   55:   unsigned char firstbyte;
   56:   size_t remaining_length;
   57: };
   58: 
   59: #endif /* HEADER_CURL_MQTT_H */