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Showing content from https://freertos.github.io/coreMQTT-Agent/main/core_mqtt_agent_config.html below:

coreMQTT Agent: Configurations

Configurations of the MQTT Agent.

configpagestyle

Configuration settings are C preprocessor constants. They can be set with a #define in the config file (core_mqtt_config.h) or by using a compiler option such as -D in gcc. The MQTT Agent uses the same configuration file as coreMQTT.

The maximum number of pending acknowledgments to track for a single connection.

Note

The MQTT agent tracks MQTT commands (such as PUBLISH and SUBSCRIBE) th at are still waiting to be acknowledged. MQTT_AGENT_MAX_OUTSTANDING_ACKS set the maximum number of acknowledgments that can be outstanding at any one time. The higher this number is the greater the agent's RAM consumption will be.

Possible values: Any positive integer up to SIZE_MAX.
Default value: 20

Time in milliseconds that the MQTT agent task will wait in the Blocked state (so not using any CPU time) for a command to arrive in its command queue before exiting the blocked state so it can call MQTT_ProcessLoop().

Note

It is important MQTT_ProcessLoop() is called often if there is known MQTT traffic, but calling it too often can take processing time away from lower priority tasks and waste CPU time and power.

Possible values: Any positive 32 bit integer.
Default value: 1000

An array of function pointers mapping command types to a function to execute. Configurable to allow a linker to remove unneeded functions.

Note

This array controls the behavior of each command. Altering the array would allow a linker to discard unused MQTT functions if desired. The size of this array MUST equal NUM_COMMANDS and the order MUST correspond to MQTTAgentCommandType_t commands if not using C99 designated initializers. If any function is desired not to be linked, it may be set to MQTTAgentCommand_ProcessLoop or a custom function matching an MQTTAgentCommandFunc_t prototype.

Default value:

{

}

MQTTStatus_t MQTTAgentCommand_Publish(MQTTAgentContext_t *pMqttAgentContext, void *pPublishArg, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a PUBLISH command.

Definition: core_mqtt_agent_command_functions.c:60

MQTTStatus_t MQTTAgentCommand_Ping(MQTTAgentContext_t *pMqttAgentContext, void *pUnusedArg, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a PING command.

Definition: core_mqtt_agent_command_functions.c:202

MQTTStatus_t MQTTAgentCommand_Terminate(MQTTAgentContext_t *pMqttAgentContext, void *pUnusedArg, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a TERMINATE command. Calls MQTTAgent_CancelAll to terminate all unfinished co...

Definition: core_mqtt_agent_command_functions.c:224

MQTTStatus_t MQTTAgentCommand_Disconnect(MQTTAgentContext_t *pMqttAgentContext, void *pUnusedArg, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a DISCONNECT command.

Definition: core_mqtt_agent_command_functions.c:181

MQTTStatus_t MQTTAgentCommand_Connect(MQTTAgentContext_t *pMqttAgentContext, void *pVoidConnectArgs, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a CONNECT command.

Definition: core_mqtt_agent_command_functions.c:147

MQTTStatus_t MQTTAgentCommand_Subscribe(MQTTAgentContext_t *pMqttAgentContext, void *pVoidSubscribeArgs, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a SUBSCRIBE command.

Definition: core_mqtt_agent_command_functions.c:91

MQTTStatus_t MQTTAgentCommand_ProcessLoop(MQTTAgentContext_t *pMqttAgentContext, void *pUnusedArg, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for a NONE command. This function does not call MQTT_ProcessLoop itself,...

Definition: core_mqtt_agent_command_functions.c:44

MQTTStatus_t MQTTAgentCommand_Unsubscribe(MQTTAgentContext_t *pMqttAgentContext, void *pVoidSubscribeArgs, MQTTAgentCommandFuncReturns_t *pReturnFlags)

Function to execute for an UNSUBSCRIBE command.

Definition: core_mqtt_agent_command_functions.c:119

@ CONNECT

Call MQTT_Connect().

Definition: core_mqtt_agent.h:57

@ DISCONNECT

Call MQTT_Disconnect().

Definition: core_mqtt_agent.h:58

@ PING

Call MQTT_Ping().

Definition: core_mqtt_agent.h:56

@ UNSUBSCRIBE

Call MQTT_Unsubscribe().

Definition: core_mqtt_agent.h:55

@ PROCESSLOOP

Call MQTT_ProcessLoop().

Definition: core_mqtt_agent.h:52

@ TERMINATE

Exit the command loop and stop processing commands.

Definition: core_mqtt_agent.h:59

@ SUBSCRIBE

Call MQTT_Subscribe().

Definition: core_mqtt_agent.h:54

@ PUBLISH

Call MQTT_Publish().

Definition: core_mqtt_agent.h:53

@ NONE

No command received. Must be zero (its memset() value).

Definition: core_mqtt_agent.h:51

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