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.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 #ifndef CURL_DISABLE_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 */ 60