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MQTT - handling re-sends when a session is reestablished. #980

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MQTT - handling re-sends when a session is reestablished. #980

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39c58ba
Handling restablishing session
leegeth Jun 4, 2020
235ebcd
Unit tests
leegeth Jun 5, 2020
e44b298
Reduce complexity and address review comments
leegeth Jun 10, 2020
5d0069e
Remove refactoring and address comments
leegeth Jun 10, 2020
4c06f59
Update unit tests
leegeth Jun 10, 2020
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7 changes: 7 additions & 0 deletions libraries/standard/mqtt/include/mqtt.h
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,13 @@
#include "mqtt_config.h"
#include "mqtt_lightweight.h"

/**
* @brief Invalid packet identifier.
*
* Zero is an invalid packet identifier as per MQTT v3.1.1 spec.
*/
#define MQTT_PACKET_ID_INVALID ( ( uint16_t ) 0U )

struct MQTTApplicationCallbacks;
typedef struct MQTTApplicationCallbacks MQTTApplicationCallbacks_t;

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16 changes: 16 additions & 0 deletions libraries/standard/mqtt/include/mqtt_state.h
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Expand Up @@ -118,4 +118,20 @@ uint16_t MQTT_StateSelect( const MQTTContext_t * pMqttContext,
MQTTPublishState_t searchState,
MQTTStateCursor_t * pCursor );

/**
* @brief Get the publish state for the publish packet with the given packet id.
*
* @param[in] pMqttContext Initialized MQTT context.
* @param[in] packetId The packet id of the packet to search for.
* @param[in] incomingPublish Whether to search for the publish packet in
* incoming publish records or the outgoing publish records. True for searching
* in incoming publish record; false for searching outgoing publish record.
*
* @return #MQTTStateNull if no publish packet found or if invalid parameters
* are passed; state of the publish packet with given packet id otherwise.
*/
MQTTPublishState_t MQTT_GetPacketState( const MQTTContext_t * pMqttContext,
uint16_t packetId,
bool incomingPublish );

#endif /* ifndef MQTT_STATE_H */
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