1#ifndef HEADER_CURL_MQTT_H 2#define HEADER_CURL_MQTT_H 3/*************************************************************************** 4 * _ _ ____ _ 5 * Project ___| | | | _ \| | 6 * / __| | | | |_) | | 7 * | (__| |_| | _ <| |___ 8 * \___|\___/|_| \_\_____| 9 * 10 * Copyright (C) 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.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 * SPDX-License-Identifier: curl 24 * 25 ***************************************************************************/ 26 27#ifndef CURL_DISABLE_MQTT 28extern const struct Curl_handler Curl_handler_mqtt; 29#endif 30 31enum mqttstate { 32 MQTT_FIRST, /* 0 */ 33 MQTT_REMAINING_LENGTH, /* 1 */ 34 MQTT_CONNACK, /* 2 */ 35 MQTT_SUBACK, /* 3 */ 36 MQTT_SUBACK_COMING, /* 4 - the SUBACK remainder */ 37 MQTT_PUBWAIT, /* 5 - wait for publish */ 38 MQTT_PUB_REMAIN, /* 6 - wait for the remainder of the publish */ 39 40 MQTT_NOSTATE /* 7 - never used an actual state */ 41}; 42 43struct mqtt_conn { 44 enum mqttstate state; 45 enum mqttstate nextstate; /* switch to this after remaining length is 46 done */ 47 unsigned int packetid; 48}; 49 50/* protocol-specific transfer-related data */ 51struct MQTT { 52 char *sendleftovers; 53 size_t nsend; /* size of sendleftovers */ 54 55 /* when receiving */ 56 size_t npacket; /* byte counter */ 57 unsigned char firstbyte; 58 size_t remaining_length; 59 struct dynbuf recvbuf; 60 unsigned char pkt_hd[4]; /* for decoding the arriving packet length */ 61}; 62 63#endif /* HEADER_CURL_MQTT_H */ 64