core_mqtt_serializer.h

Go to the documentation of this file.

/*
 * coreMQTT v2.1.0
 * Copyright (C) 2022 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
#ifndef CORE_MQTT_SERIALIZER_H
#define CORE_MQTT_SERIALIZER_H
 
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
 
/* *INDENT-OFF* */
#ifdef __cplusplus
    extern "C" {
#endif
/* *INDENT-ON */
 
/* MQTT_DO_NOT_USE_CUSTOM_CONFIG allows building the MQTT library
 * without a custom config. If a custom config is provided, the
 * MQTT_DO_NOT_USE_CUSTOM_CONFIG macro should not be defined. */
#ifndef MQTT_DO_NOT_USE_CUSTOM_CONFIG
    /* Include custom config file before other headers. */
    #include "core_mqtt_config.h"
#endif
 
/* Include config defaults header to get default values of configs not
 * defined in core_mqtt_config.h file. */
#include "core_mqtt_config_defaults.h"
 
#include "transport_interface.h"
 
/* MQTT packet types. */
 
#define MQTT_PACKET_TYPE_CONNECT        ( ( uint8_t ) 0x10U )  
#define MQTT_PACKET_TYPE_CONNACK        ( ( uint8_t ) 0x20U )  
#define MQTT_PACKET_TYPE_PUBLISH        ( ( uint8_t ) 0x30U )  
#define MQTT_PACKET_TYPE_PUBACK         ( ( uint8_t ) 0x40U )  
#define MQTT_PACKET_TYPE_PUBREC         ( ( uint8_t ) 0x50U )  
#define MQTT_PACKET_TYPE_PUBREL         ( ( uint8_t ) 0x62U )  
#define MQTT_PACKET_TYPE_PUBCOMP        ( ( uint8_t ) 0x70U )  
#define MQTT_PACKET_TYPE_SUBSCRIBE      ( ( uint8_t ) 0x82U )  
#define MQTT_PACKET_TYPE_SUBACK         ( ( uint8_t ) 0x90U )  
#define MQTT_PACKET_TYPE_UNSUBSCRIBE    ( ( uint8_t ) 0xA2U )  
#define MQTT_PACKET_TYPE_UNSUBACK       ( ( uint8_t ) 0xB0U )  
#define MQTT_PACKET_TYPE_PINGREQ        ( ( uint8_t ) 0xC0U )  
#define MQTT_PACKET_TYPE_PINGRESP       ( ( uint8_t ) 0xD0U )  
#define MQTT_PACKET_TYPE_DISCONNECT     ( ( uint8_t ) 0xE0U )  
#define MQTT_PUBLISH_ACK_PACKET_SIZE    ( 4UL )
 
/* Structures defined in this file. */
struct MQTTFixedBuffer;
struct MQTTConnectInfo;
struct MQTTSubscribeInfo;
struct MQTTPublishInfo;
struct MQTTPacketInfo;
 
typedef enum MQTTStatus
{
    MQTTSuccess = 0,      
    MQTTBadParameter,     
    MQTTNoMemory,         
    MQTTSendFailed,       
    MQTTRecvFailed,       
    MQTTBadResponse,      
    MQTTServerRefused,    
    MQTTNoDataAvailable,  
    MQTTIllegalState,     
    MQTTStateCollision,   
    MQTTKeepAliveTimeout, 
    MQTTNeedMoreBytes     
} MQTTStatus_t;
 
typedef enum MQTTQoS
{
    MQTTQoS0 = 0, 
    MQTTQoS1 = 1, 
    MQTTQoS2 = 2  
} MQTTQoS_t;
 
typedef struct MQTTFixedBuffer
{
    uint8_t * pBuffer; 
    size_t size;       
} MQTTFixedBuffer_t;
 
typedef struct MQTTConnectInfo
{
    bool cleanSession;
 
    uint16_t keepAliveSeconds;
 
    const char * pClientIdentifier;
 
    uint16_t clientIdentifierLength;
 
    const char * pUserName;
 
    uint16_t userNameLength;
 
    const char * pPassword;
 
    uint16_t passwordLength;
} MQTTConnectInfo_t;
 
typedef struct MQTTSubscribeInfo
{
    MQTTQoS_t qos;
 
    const char * pTopicFilter;
 
    uint16_t topicFilterLength;
} MQTTSubscribeInfo_t;
 
typedef struct MQTTPublishInfo
{
    MQTTQoS_t qos;
 
    bool retain;
 
    bool dup;
 
    const char * pTopicName;
 
    uint16_t topicNameLength;
 
    const void * pPayload;
 
    size_t payloadLength;
} MQTTPublishInfo_t;
 
typedef struct MQTTPacketInfo
{
    uint8_t type;
 
    uint8_t * pRemainingData;
 
    size_t remainingLength;
 
    size_t headerLength;
} MQTTPacketInfo_t;
 
/* @[declare_mqtt_getconnectpacketsize] */
MQTTStatus_t MQTT_GetConnectPacketSize( const MQTTConnectInfo_t * pConnectInfo,
                                        const MQTTPublishInfo_t * pWillInfo,
                                        size_t * pRemainingLength,
                                        size_t * pPacketSize );
/* @[declare_mqtt_getconnectpacketsize] */
 
/* @[declare_mqtt_serializeconnect] */
MQTTStatus_t MQTT_SerializeConnect( const MQTTConnectInfo_t * pConnectInfo,
                                    const MQTTPublishInfo_t * pWillInfo,
                                    size_t remainingLength,
                                    const MQTTFixedBuffer_t * pFixedBuffer );
/* @[declare_mqtt_serializeconnect] */
 
/* @[declare_mqtt_getsubscribepacketsize] */
MQTTStatus_t MQTT_GetSubscribePacketSize( const MQTTSubscribeInfo_t * pSubscriptionList,
                                          size_t subscriptionCount,
                                          size_t * pRemainingLength,
                                          size_t * pPacketSize );
/* @[declare_mqtt_getsubscribepacketsize] */
 
/* @[declare_mqtt_serializesubscribe] */
MQTTStatus_t MQTT_SerializeSubscribe( const MQTTSubscribeInfo_t * pSubscriptionList,
                                      size_t subscriptionCount,
                                      uint16_t packetId,
                                      size_t remainingLength,
                                      const MQTTFixedBuffer_t * pFixedBuffer );
/* @[declare_mqtt_serializesubscribe] */
 
/* @[declare_mqtt_getunsubscribepacketsize] */
MQTTStatus_t MQTT_GetUnsubscribePacketSize( const MQTTSubscribeInfo_t * pSubscriptionList,
                                            size_t subscriptionCount,
                                            size_t * pRemainingLength,
                                            size_t * pPacketSize );
/* @[declare_mqtt_getunsubscribepacketsize] */
 
/* @[declare_mqtt_serializeunsubscribe] */
MQTTStatus_t MQTT_SerializeUnsubscribe( const MQTTSubscribeInfo_t * pSubscriptionList,
                                        size_t subscriptionCount,
                                        uint16_t packetId,
                                        size_t remainingLength,
                                        const MQTTFixedBuffer_t * pFixedBuffer );
/* @[declare_mqtt_serializeunsubscribe] */
 
/* @[declare_mqtt_getpublishpacketsize] */
MQTTStatus_t MQTT_GetPublishPacketSize( const MQTTPublishInfo_t * pPublishInfo,
                                        size_t * pRemainingLength,
                                        size_t * pPacketSize );
/* @[declare_mqtt_getpublishpacketsize] */
 
/* @[declare_mqtt_serializepublish] */
MQTTStatus_t MQTT_SerializePublish( const MQTTPublishInfo_t * pPublishInfo,
                                    uint16_t packetId,
                                    size_t remainingLength,
                                    const MQTTFixedBuffer_t * pFixedBuffer );
/* @[declare_mqtt_serializepublish] */
 
MQTTStatus_t MQTT_SerializePublishHeaderWithoutTopic( const MQTTPublishInfo_t * pPublishInfo,
                                                      size_t remainingLength,
                                                      uint8_t * pBuffer,
                                                      size_t * headerSize );
 
/* @[declare_mqtt_serializepublishheader] */
MQTTStatus_t MQTT_SerializePublishHeader( const MQTTPublishInfo_t * pPublishInfo,
                                          uint16_t packetId,
                                          size_t remainingLength,
                                          const MQTTFixedBuffer_t * pFixedBuffer,
                                          size_t * pHeaderSize );
/* @[declare_mqtt_serializepublishheader] */
 
/* @[declare_mqtt_serializeack] */
MQTTStatus_t MQTT_SerializeAck( const MQTTFixedBuffer_t * pFixedBuffer,
                                uint8_t packetType,
                                uint16_t packetId );
/* @[declare_mqtt_serializeack] */
 
/* @[declare_mqtt_getdisconnectpacketsize] */
MQTTStatus_t MQTT_GetDisconnectPacketSize( size_t * pPacketSize );
/* @[declare_mqtt_getdisconnectpacketsize] */
 
/* @[declare_mqtt_serializedisconnect] */
MQTTStatus_t MQTT_SerializeDisconnect( const MQTTFixedBuffer_t * pFixedBuffer );
/* @[declare_mqtt_serializedisconnect] */
 
/* @[declare_mqtt_getpingreqpacketsize] */
MQTTStatus_t MQTT_GetPingreqPacketSize( size_t * pPacketSize );
/* @[declare_mqtt_getpingreqpacketsize] */
 
/* @[declare_mqtt_serializepingreq] */
MQTTStatus_t MQTT_SerializePingreq( const MQTTFixedBuffer_t * pFixedBuffer );
/* @[declare_mqtt_serializepingreq] */
 
/* @[declare_mqtt_deserializepublish] */
MQTTStatus_t MQTT_DeserializePublish( const MQTTPacketInfo_t * pIncomingPacket,
                                      uint16_t * pPacketId,
                                      MQTTPublishInfo_t * pPublishInfo );
/* @[declare_mqtt_deserializepublish] */
 
/* @[declare_mqtt_deserializeack] */
MQTTStatus_t MQTT_DeserializeAck( const MQTTPacketInfo_t * pIncomingPacket,
                                  uint16_t * pPacketId,
                                  bool * pSessionPresent );
/* @[declare_mqtt_deserializeack] */
 
/* @[declare_mqtt_getincomingpackettypeandlength] */
MQTTStatus_t MQTT_GetIncomingPacketTypeAndLength( TransportRecv_t readFunc,
                                                  NetworkContext_t * pNetworkContext,
                                                  MQTTPacketInfo_t * pIncomingPacket );
/* @[declare_mqtt_getincomingpackettypeandlength] */
 
 /* @[declare_mqtt_processincomingpackettypeandlength] */
MQTTStatus_t MQTT_ProcessIncomingPacketTypeAndLength( const uint8_t * pBuffer,
                                                      const size_t * pIndex,
                                                      MQTTPacketInfo_t * pIncomingPacket );
/* @[declare_mqtt_processincomingpackettypeandlength] */
 
uint8_t * MQTT_SerializeConnectFixedHeader( uint8_t * pIndex,
                                            const MQTTConnectInfo_t * pConnectInfo,
                                            const MQTTPublishInfo_t * pWillInfo,
                                            size_t remainingLength );
uint8_t * MQTT_SerializeSubscribeHeader( size_t remainingLength,
                                         uint8_t * pIndex,
                                         uint16_t packetId );
uint8_t * MQTT_SerializeUnsubscribeHeader( size_t remainingLength,
                                           uint8_t * pIndex,
                                           uint16_t packetId );
/* *INDENT-OFF* */
#ifdef __cplusplus
    }
#endif
/* *INDENT-ON* */
 
#endif /* ifndef CORE_MQTT_SERIALIZER_H */