/* | |
* FreeRTOS Kernel V10.2.1 | |
* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
* | |
* 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. | |
* | |
* http://www.FreeRTOS.org | |
* http://aws.amazon.com/freertos | |
* | |
* 1 tab == 4 spaces! | |
*/ | |
/* Standard inclues. */ | |
#include <string.h> | |
#include <stdio.h> | |
/* Kernel includes. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
/* IoT SDK includes. */ | |
#include "iot_mqtt.h" | |
#include "iot_taskpool.h" | |
#include "platform/iot_network_freertos.h" | |
/** | |
* @brief The keep-alive interval used for this example. | |
* | |
* An MQTT ping request will be sent periodically at this interval. | |
*/ | |
#define mqttexampleKEEP_ALIVE_SECONDS ( 60 ) | |
/** | |
* @brief The timeout for MQTT operations in this example. | |
*/ | |
#define mqttexampleMQTT_TIMEOUT_MS ( 50000 ) | |
/** | |
* @brief The MQTT client identifier used in this example. | |
*/ | |
#define mqttexampleCLIENT_IDENTIFIER "mqttexampleclient" | |
const char *pcClientIdentifiers[] = { "AAA" };//, "BBB", "CCC", "DDD", "EEE", "FFF", "GGG", "HHH", "III", "JJJ" }; | |
/** | |
* @brief Details of the MQTT broker to connect to. | |
* | |
* @note This example does not use TLS and therefore won't work with AWS IoT. | |
* | |
*/ | |
#define mqttexampleMQTT_BROKER_ENDPOINT "test.mosquitto.org" | |
#define mqttexampleMQTT_BROKER_PORT 1883 | |
/** | |
* @brief The topic to subscribe and publish to in the example. | |
*/ | |
#define mqttexampleTOPIC "example/topic" | |
/** | |
* @brief The MQTT message published in this example. | |
*/ | |
#define mqttexampleMESSAGE "Hello World!" | |
/** | |
* @brief Paramters to control the retry behaviour in case a QoS1 publish | |
* message gets lost. | |
* | |
* Retry every minutes up to a maximum of 5 retries. | |
*/ | |
#define mqttexamplePUBLISH_RETRY_MS ( 1000 ) | |
#define mqttexamplePUBLISH_RETRY_LIMIT ( 5 ) | |
/** | |
* @brief The bit which is set in the demo task's notification value from the | |
* disconnect callback to inform the demo task about the MQTT disconnect. | |
*/ | |
#define mqttexampleDISCONNECTED_BIT ( 1UL << 0UL ) | |
/** | |
* @brief The bit which is set in the demo task's notification value from the | |
* publish callback to inform the demo task about the message received from the | |
* MQTT broker. | |
*/ | |
#define mqttexampleMESSAGE_RECEIVED_BIT ( 1UL << 1UL ) | |
/*-----------------------------------------------------------*/ | |
/** | |
* @brief Parameters used to create the system task pool. | |
*/ | |
static const IotTaskPoolInfo_t xTaskPoolParameters = { | |
/* Minimum number of threads in a task pool. | |
* Note the slimmed down version of the task | |
* pool used by this library does not autoscale | |
* the number of tasks in the pool so in this | |
* case this sets the number of tasks in the | |
* pool. */ | |
2, | |
/* Maximum number of threads in a task pool. | |
* Note the slimmed down version of the task | |
* pool used by this library does not autoscale | |
* the number of tasks in the pool so in this | |
* case this parameter is just ignored. */ | |
2, | |
/* Stack size for every task pool thread - in | |
* bytes, hence multiplying by the number of bytes | |
* in a word as configMINIMAL_STACK_SIZE is | |
* specified in words. */ | |
configMINIMAL_STACK_SIZE * sizeof( portSTACK_TYPE ), | |
/* Priority for every task pool thread. */ | |
tskIDLE_PRIORITY, | |
}; | |
/*-----------------------------------------------------------*/ | |
/** | |
* @brief The task used to demonstrate the MQTT API. | |
* | |
* @param[in] pvParameters Parmaters as passed at the time of task creation. Not | |
* used in this example. | |
*/ | |
static void prvMQTTDemoTask( void *pvParameters ); | |
/** | |
* @brief The callback invoked by the MQTT library when the MQTT connection gets | |
* disconnected. | |
* | |
* @param[in] pvCallbackContext Callback context as provided at the time of | |
* connect. | |
* @param[in] pxCallbackParams Contains the reason why the MQTT connection was | |
* disconnected. | |
*/ | |
static void prvExample_OnDisconnect( void * pvCallbackContext, | |
IotMqttCallbackParam_t * pxCallbackParams ); | |
/** | |
* @brief The callback invoked by the MQTT library when a message is received on | |
* a subscribed topic from the MQTT broker. | |
* | |
* @param[in] pvCallbackContext Callback context as provided at the time of | |
* subscribe. | |
* @param[in] pxCallbackParams Contain the details about the received message - | |
* topic on which the message was received, the received message. | |
*/ | |
static void prvExample_OnMessageReceived( void * pvCallbackContext, | |
IotMqttCallbackParam_t * pxCallbackParams ); | |
/** | |
* @brief Connects to the MQTT broker as specified in mqttexampleMQTT_BROKER_ENDPOINT | |
* and mqttexampleMQTT_BROKER_PORT. | |
* | |
* @note This example does not use TLS and therefore will not work with MQTT. | |
*/ | |
static void prvMQTTConnect( IotMqttConnection_t *xMQTTConnection, const char *pcClientID ); | |
/** | |
* @brief Subscribes to pcTopicString. | |
*/ | |
static void prvMQTTSubscribe( IotMqttConnection_t xMQTTConnection, const char * const pcTopicString ); | |
/** | |
* @brief Publishes a messages mqttexampleMESSAGE on mqttexampleTOPIC topic. | |
*/ | |
static void prvMQTTPublish( IotMqttConnection_t xMQTTConnection, const char * const pcTopicString ); | |
/** | |
* @brief Unsubscribes from the mqttexampleTOPIC topic. | |
*/ | |
static void prvMQTTUnsubscribe( IotMqttConnection_t xMQTTConnection, const char * const pcTopicString ); | |
/** | |
* @brief Disconnects from the MQTT broker gracefully by sending an MQTT | |
* DISCONNECT message. | |
*/ | |
static void prvMQTTDisconnect( IotMqttConnection_t xMQTTConnection ); | |
/*-----------------------------------------------------------*/ | |
static void prvExample_OnDisconnect( void * pvCallbackContext, | |
IotMqttCallbackParam_t * pxCallbackParams ) | |
{ | |
TaskHandle_t xDemoTaskHandle = ( TaskHandle_t ) pvCallbackContext; | |
/* Ensure that we initiated the disconnect. */ | |
configASSERT( pxCallbackParams->u.disconnectReason == IOT_MQTT_DISCONNECT_CALLED ); | |
/* Inform the demo task about the disconnect. */ | |
xTaskNotify( xDemoTaskHandle, | |
mqttexampleDISCONNECTED_BIT, | |
eSetBits /* Set the mqttexampleDISCONNECTED_BIT in the demo task's notification value. */ | |
); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvExample_OnMessageReceived( void * pvCallbackContext, | |
IotMqttCallbackParam_t * pxCallbackParams ) | |
{ | |
TaskHandle_t xDemoTaskHandle = ( TaskHandle_t ) pvCallbackContext; | |
/* Ensure that the message is received on the expected topic. */ | |
// configASSERT( pxCallbackParams->u.message.info.topicNameLength == strlen( mqttexampleTOPIC ) ); | |
// configASSERT( strncmp( pxCallbackParams->u.message.info.pTopicName, | |
// mqttexampleTOPIC, | |
// strlen( mqttexampleTOPIC ) ) == 0 ); | |
/* Ensure that the expected message is received. */ | |
configASSERT( pxCallbackParams->u.message.info.payloadLength == strlen( mqttexampleMESSAGE ) ); | |
configASSERT( strncmp( pxCallbackParams->u.message.info.pPayload, | |
mqttexampleMESSAGE, | |
strlen( mqttexampleMESSAGE ) ) == 0 ); | |
/* Ensure that the message QoS is as expected. */ | |
configASSERT( pxCallbackParams->u.message.info.qos == IOT_MQTT_QOS_1 ); | |
/* Although this print uses the constants rather than the data from the | |
* message payload the asserts above have already checked the message | |
* payload equals the constants, and it is more efficient not to have to | |
* worry about lengths in the print. */ | |
configPRINTF( ( "Received %s on the topic %s\r\n", mqttexampleMESSAGE, mqttexampleTOPIC ) ); | |
/* Inform the demo task about the message received from the MQTT broker. */ | |
xTaskNotify( xDemoTaskHandle, | |
mqttexampleMESSAGE_RECEIVED_BIT, | |
eSetBits /* Set the mqttexampleMESSAGE_RECEIVED_BIT in the demo task's notification value. */ | |
); | |
} | |
/*-----------------------------------------------------------*/ | |
void vStartSimpleMQTTDemo( void ) | |
{ | |
uint32_t x; | |
const uint32_t ulMax_x = sizeof( pcClientIdentifiers ) / sizeof( char * ); | |
/* This example uses a single application task, which in turn is used to | |
* connect, subscribe, publish, unsubscribe and disconnect from the MQTT | |
* broker. */ | |
for( x = 0; x < ulMax_x; x++ ) | |
{ | |
xTaskCreate( prvMQTTDemoTask, /* Function that implements the task. */ | |
"MQTTDemo", /* Text name for the task - only used for debugging. */ | |
configMINIMAL_STACK_SIZE, /* Size of stack (in words, not bytes) to allocate for the task. */ | |
( void * ) x, /* Task parameter - not used in this case. */ | |
tskIDLE_PRIORITY, /* Task priority, must be between 0 and configMAX_PRIORITIES - 1. */ | |
NULL ); /* Used to pass out a handle to the created task - not used in this case. */ | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvMQTTDemoTask( void *pvParameters ) | |
{ | |
IotMqttError_t xResult; | |
uint32_t ulNotificationValue = 0, ulPublishCount; | |
uint32_t ulMaxPublishCount = 0UL; | |
const TickType_t xNoDelay = ( TickType_t ) 1; | |
IotMqttConnection_t xMQTTConnection = IOT_MQTT_CONNECTION_INITIALIZER; | |
uint32_t ulTaskNumber = ( uint32_t ) pvParameters, x; | |
char cTopicString[ sizeof( mqttexampleTOPIC ) + 5 ];//_RB_ Access by other tasks so must be persistant and will cause memory faults on memory protected systems. | |
#pragma message ("Access by other tasks so must be persistant and will cause memory faults on memory protected systems.") | |
/* Remove compiler warnings about unused parameters. */ | |
( void ) pvParameters; | |
/* The MQTT library needs a task pool, so create the system task pool. */ | |
xResult = IotTaskPool_CreateSystemTaskPool( &( xTaskPoolParameters ) ); | |
configASSERT( xResult == IOT_TASKPOOL_SUCCESS ); | |
/* MQTT library must be initialized before it can be used. This is just one | |
* time initialization. */ | |
xResult = IotMqtt_Init(); | |
configASSERT( xResult == IOT_MQTT_SUCCESS ); | |
/* Create a topic string that is unique to the MQTT connection created by | |
this task. */ | |
snprintf( cTopicString, sizeof( cTopicString ), "%s/%s", mqttexampleTOPIC, pcClientIdentifiers[ ulTaskNumber ] ); | |
for( ; ; ) | |
{ | |
/* Don't expect any notifications to be pending yet. */ | |
ulNotificationValue = ulTaskNotifyTake( pdTRUE, xNoDelay ); | |
configASSERT( ulNotificationValue == 0 ); | |
/****************************** Connect. ******************************/ | |
/* Establish a connection to the MQTT broker. This example connects to | |
* the MQTT broker as specified in mqttexampleMQTT_BROKER_ENDPOINT and | |
* mqttexampleMQTT_BROKER_PORT at the top of this file. Please change | |
* it to the MQTT broker you want to connect to. Note that this example | |
* does not use TLS and therefore will not work with AWS IoT. */ | |
prvMQTTConnect( &xMQTTConnection, pcClientIdentifiers[ ulTaskNumber ] ); | |
configPRINTF( ( "Connected to %s\r\n", mqttexampleMQTT_BROKER_ENDPOINT ) ); | |
/**************************** Subscribe. ******************************/ | |
/* The client is now connected to the broker. Subscribe to the topic | |
* as specified in mqttexampleTOPIC at the top of this file. This | |
* client will then publish to the same topic it subscribed to, so will | |
* expect all the messages it sends to the broker to be sent back to it | |
* from the broker. */ | |
prvMQTTSubscribe( xMQTTConnection, cTopicString ); | |
configPRINTF( ( "Subscribed to the topic %s\r\n", cTopicString ) ); | |
/*********************** Publish 5 messages. **************************/ | |
/* Publish a few messages while connected. */ | |
for( x = 0; x < ( ulTaskNumber + 1UL ); x++ ) | |
{ | |
ulMaxPublishCount = uxRand(); | |
} | |
/* Cap ulMaxPublishCount but ensure it is not zero. */ | |
ulMaxPublishCount %= 10UL; | |
ulMaxPublishCount++; | |
for( ulPublishCount = 0; ulPublishCount < ulMaxPublishCount; ulPublishCount++ ) | |
{ | |
/* Publish a message on the mqttexampleTOPIC topic as specified at | |
* the top of this file. */ | |
prvMQTTPublish( xMQTTConnection, cTopicString ); | |
configPRINTF( ( "Published %s on the topic %s\r\n", mqttexampleMESSAGE, cTopicString ) ); | |
/* Since we are subscribed to the same topic as we published on, we | |
* will get the same message back from the MQTT broker. Wait for the | |
* message to be received which is informed to us by the publish | |
* callback (prvExample_OnMessageReceived) by setting the | |
* mqttexampleMESSAGE_RECEIVED_BIT in this task's notification | |
* value. Note that the bit is cleared in the task's notification | |
* value to ensure that it is ready for next message. */ | |
xTaskNotifyWait( 0UL, /* Don't clear any bits on entry. */ | |
mqttexampleMESSAGE_RECEIVED_BIT, /* Clear bit on exit. */ | |
&( ulNotificationValue ), /* Obtain the notification value. */ | |
pdMS_TO_TICKS( mqttexampleMQTT_TIMEOUT_MS ) ); | |
configASSERT( ( ulNotificationValue & mqttexampleMESSAGE_RECEIVED_BIT ) == mqttexampleMESSAGE_RECEIVED_BIT ); | |
} | |
/******************* Unsubscribe and Disconnect. **********************/ | |
/* Unsubscribe from the topic mqttexampleTOPIC and disconnect | |
* gracefully. */ | |
prvMQTTUnsubscribe( xMQTTConnection, cTopicString ); | |
prvMQTTDisconnect( xMQTTConnection ); | |
configPRINTF( ( "Disconnected from %s\r\n\r\n", mqttexampleMQTT_BROKER_ENDPOINT ) ); | |
/* Wait for the disconnect operation to complete which is informed to us | |
* by the disconnect callback (prvExample_OnDisconnect)by setting | |
* the mqttexampleDISCONNECTED_BIT in this task's notification value. | |
* Note that the bit is cleared in the task's notification value to | |
* ensure that it is ready for the next run. */ | |
xTaskNotifyWait( 0UL, /* Don't clear any bits on entry. */ | |
mqttexampleDISCONNECTED_BIT, /* Clear bit on exit. */ | |
&( ulNotificationValue ), /* Obtain the notification value. */ | |
pdMS_TO_TICKS( mqttexampleMQTT_TIMEOUT_MS ) ); | |
configASSERT( ( ulNotificationValue & mqttexampleDISCONNECTED_BIT ) == mqttexampleDISCONNECTED_BIT ); | |
/* Wait for some time between two iterations to ensure that we do not | |
* bombard the public test mosquitto broker. */ | |
configPRINTF( ( "prvMQTTDemoTask() completed an iteration without hitting an assert. Total free heap is %u\r\n\r\n", xPortGetFreeHeapSize() ) ); | |
// vTaskDelay( pdMS_TO_TICKS( 5000 ) ); | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvMQTTConnect( IotMqttConnection_t *xMQTTConnection, const char *pcClientID ) | |
{ | |
IotMqttError_t xResult; | |
IotNetworkServerInfo_t xMQTTBrokerInfo; | |
IotMqttNetworkInfo_t xNetworkInfo = IOT_MQTT_NETWORK_INFO_INITIALIZER; | |
IotMqttConnectInfo_t xConnectInfo = IOT_MQTT_CONNECT_INFO_INITIALIZER; | |
static char c[ 10 ]; | |
static int id = 0; | |
/******************* Broker information setup. **********************/ | |
xMQTTBrokerInfo.pHostName = mqttexampleMQTT_BROKER_ENDPOINT; | |
xMQTTBrokerInfo.port = mqttexampleMQTT_BROKER_PORT; | |
/******************* Network information setup. **********************/ | |
/* No connection to the MQTT broker has been established yet and we want to | |
* establish a new connection. */ | |
xNetworkInfo.createNetworkConnection = true; | |
xNetworkInfo.u.setup.pNetworkServerInfo = &( xMQTTBrokerInfo ); | |
/* This example does not use TLS and therefore pNetworkCredentialInfo must | |
* be set to NULL. */ | |
xNetworkInfo.u.setup.pNetworkCredentialInfo = NULL; | |
/* Use FreeRTOS+TCP network. */ | |
xNetworkInfo.pNetworkInterface = IOT_NETWORK_INTERFACE_FREERTOS; | |
/* Setup the callback which is called when the MQTT connection is | |
* disconnected. The task handle is passed as the callback context which | |
* is used by the callback to send a task notification to this task.*/ | |
xNetworkInfo.disconnectCallback.pCallbackContext = ( void * ) xTaskGetCurrentTaskHandle(); | |
xNetworkInfo.disconnectCallback.function = prvExample_OnDisconnect; | |
/****************** MQTT Connection information setup. ********************/ | |
/* Set this flag to true if connecting to the AWS IoT MQTT broker. This | |
* example does not use TLS and therefore won't work with AWS IoT. */ | |
xConnectInfo.awsIotMqttMode = false; | |
/* Start with a clean session i.e. direct the MQTT broker to discard any | |
* previous session data. Also, establishing a connection with clean session | |
* will ensure that the broker does not store any data when this client | |
* gets disconnected. */ | |
xConnectInfo.cleanSession = true; | |
/* Since we are starting with a clean session, there are no previous | |
* subscriptions to be restored. */ | |
xConnectInfo.pPreviousSubscriptions = NULL; | |
xConnectInfo.previousSubscriptionCount = 0; | |
/* We do not want to publish Last Will and Testament (LWT) message if the | |
* client gets disconnected. */ | |
xConnectInfo.pWillInfo = NULL; | |
/* Send an MQTT PING request every minute to keep the connection open if | |
there is no other MQTT traffic. */ | |
xConnectInfo.keepAliveSeconds = mqttexampleKEEP_ALIVE_SECONDS; | |
/* The client identifier is used to uniquely identify this MQTT client to | |
* the MQTT broker. In a production device the identifier can be something | |
* unique, such as a device serial number. */ | |
xConnectInfo.pClientIdentifier = pcClientID; | |
xConnectInfo.clientIdentifierLength = ( uint16_t ) strlen( pcClientID ); | |
/* This example does not use any authentication and therefore username and | |
* password fields are not used. */ | |
xConnectInfo.pUserName = NULL; | |
xConnectInfo.userNameLength = 0; | |
xConnectInfo.pPassword = NULL; | |
xConnectInfo.passwordLength = 0; | |
/* Establish the connection to the MQTT broker - It is a blocking call and | |
will return only when connection is complete or a timeout occurs. */ | |
xResult = IotMqtt_Connect( &( xNetworkInfo ), | |
&( xConnectInfo ), | |
mqttexampleMQTT_TIMEOUT_MS, | |
xMQTTConnection ); | |
configASSERT( xResult == IOT_MQTT_SUCCESS ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvMQTTSubscribe( IotMqttConnection_t xMQTTConnection, const char * const pcTopicString ) | |
{ | |
IotMqttError_t xResult; | |
IotMqttSubscription_t xMQTTSubscription; | |
/* Subscribe to the mqttexampleTOPIC topic filter. The task handle is passed | |
* as the callback context which is used by the callback to send a task | |
* notification to this task.*/ | |
xMQTTSubscription.qos = IOT_MQTT_QOS_1; | |
xMQTTSubscription.pTopicFilter = pcTopicString; | |
xMQTTSubscription.topicFilterLength = ( uint16_t ) strlen( pcTopicString ); | |
xMQTTSubscription.callback.pCallbackContext = ( void * ) xTaskGetCurrentTaskHandle(); | |
xMQTTSubscription.callback.function = prvExample_OnMessageReceived; | |
/* Use the synchronous API to subscribe - It is a blocking call and only | |
* returns when the subscribe operation is complete or a timeout occurs. */ | |
xResult = IotMqtt_TimedSubscribe( xMQTTConnection, | |
&( xMQTTSubscription ), | |
1, /* We are subscribing to one topic filter. */ | |
0, /* flags - currently ignored. */ | |
mqttexampleMQTT_TIMEOUT_MS ); | |
configASSERT( xResult == IOT_MQTT_SUCCESS ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvMQTTPublish( IotMqttConnection_t xMQTTConnection, const char * const pcTopicString ) | |
{ | |
IotMqttError_t xResult; | |
IotMqttPublishInfo_t xMQTTPublishInfo; | |
/* Publish a message with QoS1 on the mqttexampleTOPIC topic. Since we are | |
* subscribed to the same topic, the MQTT broker will send the same message | |
* back to us. It is verified in the publish callback. */ | |
xMQTTPublishInfo.qos = IOT_MQTT_QOS_1; | |
xMQTTPublishInfo.retain = false; | |
xMQTTPublishInfo.pTopicName = pcTopicString; | |
xMQTTPublishInfo.topicNameLength = ( uint16_t ) strlen( pcTopicString ); | |
xMQTTPublishInfo.pPayload = mqttexampleMESSAGE; | |
xMQTTPublishInfo.payloadLength = strlen( mqttexampleMESSAGE ); | |
xMQTTPublishInfo.retryMs = mqttexamplePUBLISH_RETRY_MS; | |
xMQTTPublishInfo.retryLimit = mqttexamplePUBLISH_RETRY_LIMIT; | |
/* Use the synchronous API to publish - It is a blocking call and only | |
* returns when the publish operation is complete or a timeout occurs. */ | |
xResult = IotMqtt_TimedPublish( xMQTTConnection, | |
&( xMQTTPublishInfo ), | |
0, /* flags - currently ignored. */ | |
mqttexampleMQTT_TIMEOUT_MS ); | |
configASSERT( xResult == IOT_MQTT_SUCCESS ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvMQTTUnsubscribe( IotMqttConnection_t xMQTTConnection, const char * const pcTopicString ) | |
{ | |
IotMqttError_t xResult; | |
IotMqttSubscription_t xMQTTSubscription; | |
/* Unsubscribe from the mqttexampleTOPIC topic filter. */ | |
xMQTTSubscription.pTopicFilter = pcTopicString; | |
xMQTTSubscription.topicFilterLength = ( uint16_t ) strlen( pcTopicString ); | |
/* The following members of the IotMqttSubscription_t are ignored by the | |
* unsubscribe operation. Just initialize them to avoid "use of uninitialized | |
* variable" warnings. */ | |
xMQTTSubscription.qos = IOT_MQTT_QOS_1; | |
xMQTTSubscription.callback.pCallbackContext = NULL; | |
xMQTTSubscription.callback.function = NULL; | |
/* Use the synchronous API to unsubscribe - It is a blocking call and only | |
* returns when the unsubscribe operation is complete or a timeout occurs. */ | |
xResult = IotMqtt_TimedUnsubscribe( xMQTTConnection, | |
&( xMQTTSubscription ), | |
1, /* We are unsubscribing from one topic filter. */ | |
0, /* flags - currently ignored. */ | |
mqttexampleMQTT_TIMEOUT_MS ); | |
configASSERT( xResult == IOT_MQTT_SUCCESS ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvMQTTDisconnect( IotMqttConnection_t xMQTTConnection ) | |
{ | |
/* Send a MQTT DISCONNECT packet to the MQTT broker to do a graceful | |
* disconnect. */ | |
IotMqtt_Disconnect( xMQTTConnection, | |
0 /* flags - 0 means a graceful disconnect by sending MQTT DISCONNECT. */ | |
); | |
} | |
/*-----------------------------------------------------------*/ |