bool isSubscriptionPresent(const char *pThingName, ShadowActions_t action) {
uint8_t i = 0;
bool isAcceptedPresent = false;
bool isRejectedPresent = false;
char TemporaryTopicNameAccepted[MAX_SHADOW_TOPIC_LENGTH_BYTES];
char TemporaryTopicNameRejected[MAX_SHADOW_TOPIC_LENGTH_BYTES];
topicNameFromThingAndAction(TemporaryTopicNameAccepted, pThingName, action, SHADOW_ACCEPTED);
topicNameFromThingAndAction(TemporaryTopicNameRejected, pThingName, action, SHADOW_REJECTED);
for(i = 0; i < MAX_TOPICS_AT_ANY_GIVEN_TIME; i++) {
if(!SubscriptionList[i].isFree) {
if((strcmp(TemporaryTopicNameAccepted, SubscriptionList[i].Topic) == 0)) {
isAcceptedPresent = true;
} else if((strcmp(TemporaryTopicNameRejected, SubscriptionList[i].Topic) == 0)) {
isRejectedPresent = true;
}
}
}
if(isRejectedPresent && isAcceptedPresent) {
return true;
}
return false;
}
IoT_Error_t subscribeToShadowActionAcks(const char *pThingName, ShadowActions_t action, bool isSticky) {
IoT_Error_t ret_val = SUCCESS;
bool clearBothEntriesFromList = true;
int16_t indexAcceptedSubList = 0;
int16_t indexRejectedSubList = 0;
Timer subSettlingtimer;
indexAcceptedSubList = getNextFreeIndexOfSubscriptionList();
indexRejectedSubList = getNextFreeIndexOfSubscriptionList();
if(indexAcceptedSubList >= 0 && indexRejectedSubList >= 0) {
topicNameFromThingAndAction(SubscriptionList[indexAcceptedSubList].Topic, pThingName, action, SHADOW_ACCEPTED);
ret_val = aws_iot_mqtt_subscribe(pMqttClient, SubscriptionList[indexAcceptedSubList].Topic,
(uint16_t) strlen(SubscriptionList[indexAcceptedSubList].Topic), QOS0,
AckStatusCallback, NULL);
if(ret_val == SUCCESS) {
SubscriptionList[indexAcceptedSubList].count = 1;
SubscriptionList[indexAcceptedSubList].isSticky = isSticky;
topicNameFromThingAndAction(SubscriptionList[indexRejectedSubList].Topic, pThingName, action,
SHADOW_REJECTED);
ret_val = aws_iot_mqtt_subscribe(pMqttClient, SubscriptionList[indexRejectedSubList].Topic,
(uint16_t) strlen(SubscriptionList[indexRejectedSubList].Topic), QOS0,
AckStatusCallback, NULL);
if(ret_val == SUCCESS) {
SubscriptionList[indexRejectedSubList].count = 1;
SubscriptionList[indexRejectedSubList].isSticky = isSticky;
clearBothEntriesFromList = false;
// wait for SUBSCRIBE_SETTLING_TIME seconds to let the subscription take effect
init_timer(&subSettlingtimer);
countdown_sec(&subSettlingtimer, SUBSCRIBE_SETTLING_TIME);
while(!has_timer_expired(&subSettlingtimer));
}
}
}
if(clearBothEntriesFromList) {
if(indexAcceptedSubList >= 0) {
SubscriptionList[indexAcceptedSubList].isFree = true;
} else if(indexRejectedSubList >= 0) {
SubscriptionList[indexRejectedSubList].isFree = true;
}
if(SubscriptionList[indexAcceptedSubList].count == 1) {
aws_iot_mqtt_unsubscribe(pMqttClient, SubscriptionList[indexAcceptedSubList].Topic,
(uint16_t) strlen(SubscriptionList[indexAcceptedSubList].Topic));
}
}
return ret_val;
}
IoT_Error_t subscribeToShadowActionAcks(const char *pThingName, ShadowActions_t action, bool isSticky) {
IoT_Error_t ret_val = NONE_ERROR;
MQTTSubscribeParams subParams = MQTTSubscribeParamsDefault;
bool clearBothEntriesFromList = true;
int16_t indexAcceptedSubList = 0;
int16_t indexRejectedSubList = 0;
indexAcceptedSubList = getNextFreeIndexOfSubscriptionList();
indexRejectedSubList = getNextFreeIndexOfSubscriptionList();
if (indexAcceptedSubList >= 0 && indexRejectedSubList >= 0) {
topicNameFromThingAndAction(SubscriptionList[indexAcceptedSubList].Topic, pThingName, action, SHADOW_ACCEPTED);
subParams.mHandler = AckStatusCallback;
subParams.qos = QOS_0;
subParams.pTopic = SubscriptionList[indexAcceptedSubList].Topic;
ret_val = pMqttClient->subscribe(&subParams);
if (ret_val == NONE_ERROR) {
SubscriptionList[indexAcceptedSubList].count = 1;
SubscriptionList[indexAcceptedSubList].isSticky = isSticky;
topicNameFromThingAndAction(SubscriptionList[indexRejectedSubList].Topic, pThingName, action,
SHADOW_REJECTED);
subParams.pTopic = SubscriptionList[indexRejectedSubList].Topic;
ret_val = pMqttClient->subscribe(&subParams);
if (ret_val == NONE_ERROR) {
SubscriptionList[indexRejectedSubList].count = 1;
SubscriptionList[indexRejectedSubList].isSticky = isSticky;
clearBothEntriesFromList = false;
// wait for SUBSCRIBE_SETTLING_TIME seconds to let the subscription take effect
Timer subSettlingtimer;
InitTimer(&subSettlingtimer);
countdown(&subSettlingtimer, SUBSCRIBE_SETTLING_TIME);
while(!expired(&subSettlingtimer));
}
}
}
if (clearBothEntriesFromList) {
if (indexAcceptedSubList >= 0) {
SubscriptionList[indexAcceptedSubList].isFree = true;
} else if (indexRejectedSubList >= 0) {
SubscriptionList[indexRejectedSubList].isFree = true;
}
if (SubscriptionList[indexAcceptedSubList].count == 1) {
ret_val = pMqttClient->unsubscribe(SubscriptionList[indexAcceptedSubList].Topic);
}
}
return ret_val;
}
void incrementSubscriptionCnt(const char *pThingName, ShadowActions_t action, bool isSticky) {
char TemporaryTopicNameAccepted[MAX_SHADOW_TOPIC_LENGTH_BYTES];
char TemporaryTopicNameRejected[MAX_SHADOW_TOPIC_LENGTH_BYTES];
uint8_t i;
topicNameFromThingAndAction(TemporaryTopicNameAccepted, pThingName, action, SHADOW_ACCEPTED);
topicNameFromThingAndAction(TemporaryTopicNameRejected, pThingName, action, SHADOW_REJECTED);
for(i = 0; i < MAX_TOPICS_AT_ANY_GIVEN_TIME; i++) {
if(!SubscriptionList[i].isFree) {
if((strcmp(TemporaryTopicNameAccepted, SubscriptionList[i].Topic) == 0)
|| (strcmp(TemporaryTopicNameRejected, SubscriptionList[i].Topic) == 0)) {
SubscriptionList[i].count++;
SubscriptionList[i].isSticky = isSticky;
}
}
}
}
static void unsubscribeFromAcceptedAndRejected(uint8_t index) {
char TemporaryTopicNameAccepted[MAX_SHADOW_TOPIC_LENGTH_BYTES];
char TemporaryTopicNameRejected[MAX_SHADOW_TOPIC_LENGTH_BYTES];
IoT_Error_t ret_val = SUCCESS;
int16_t indexSubList;
topicNameFromThingAndAction(TemporaryTopicNameAccepted, AckWaitList[index].thingName, AckWaitList[index].action,
SHADOW_ACCEPTED);
topicNameFromThingAndAction(TemporaryTopicNameRejected, AckWaitList[index].thingName, AckWaitList[index].action,
SHADOW_REJECTED);
indexSubList = findIndexOfSubscriptionList(TemporaryTopicNameAccepted);
if((indexSubList >= 0)) {
if(!SubscriptionList[indexSubList].isSticky && (SubscriptionList[indexSubList].count == 1)) {
ret_val = aws_iot_mqtt_unsubscribe(pMqttClient, TemporaryTopicNameAccepted,
(uint16_t) strlen(TemporaryTopicNameAccepted));
if(ret_val == SUCCESS) {
SubscriptionList[indexSubList].isFree = true;
}
} else if(SubscriptionList[indexSubList].count > 1) {
SubscriptionList[indexSubList].count--;
}
}
indexSubList = findIndexOfSubscriptionList(TemporaryTopicNameRejected);
if((indexSubList >= 0)) {
if(!SubscriptionList[indexSubList].isSticky && (SubscriptionList[indexSubList].count == 1)) {
ret_val = aws_iot_mqtt_unsubscribe(pMqttClient, TemporaryTopicNameRejected,
(uint16_t) strlen(TemporaryTopicNameRejected));
if(ret_val == SUCCESS) {
SubscriptionList[indexSubList].isFree = true;
}
} else if(SubscriptionList[indexSubList].count > 1) {
SubscriptionList[indexSubList].count--;
}
}
}
IoT_Error_t publishToShadowAction(const char *pThingName, ShadowActions_t action, const char *pJsonDocumentToBeSent) {
IoT_Error_t ret_val = SUCCESS;
char TemporaryTopicName[MAX_SHADOW_TOPIC_LENGTH_BYTES];
topicNameFromThingAndAction(TemporaryTopicName, pThingName, action, SHADOW_ACTION);
IoT_Publish_Message_Params msgParams;// = MQTTMessageParamsDefault;
msgParams.qos = QOS0;
msgParams.payloadLen = strlen(pJsonDocumentToBeSent) + 1;
msgParams.payload = (char *) pJsonDocumentToBeSent;
ret_val = aws_iot_mqtt_publish(pMqttClient, TemporaryTopicName, (uint16_t)strlen(TemporaryTopicName), &msgParams);
return ret_val;
}
IoT_Error_t publishToShadowAction(const char * pThingName, ShadowActions_t action, const char *pJsonDocumentToBeSent) {
IoT_Error_t ret_val = NONE_ERROR;
char TemporaryTopicName[MAX_SHADOW_TOPIC_LENGTH_BYTES];
topicNameFromThingAndAction(TemporaryTopicName, pThingName, action, SHADOW_ACTION);
MQTTPublishParams pubParams = MQTTPublishParamsDefault;
pubParams.pTopic = TemporaryTopicName;
MQTTMessageParams msgParams = MQTTMessageParamsDefault;
msgParams.qos = QOS_0;
msgParams.PayloadLen = strlen(pJsonDocumentToBeSent) + 1;
msgParams.pPayload = (char *) pJsonDocumentToBeSent;
pubParams.MessageParams = msgParams;
ret_val = pMqttClient->publish(&pubParams);
return ret_val;
}
