int ToggleLED(UserLed user_led)
{
int ret;
LED_State state;
ret = GetLEDState(user_led, &state);
if (ret!=0)
return -1;
return SetLEDState(user_led, !state);
}
/*******************************************************************************
* MQTT Callback Handler
*
* Is called when the LEd status changes ()
********************************************************************************/
int MQTTcallbackHandler(MQTTCallbackParams params)
{
IoT_Error_t rc = NONE_ERROR;
int ret;
bool des_state, rep_state;
int payload_len = (int)params.MessageParams.PayloadLen;
char* payload = (char*)params.MessageParams.pPayload;
//Receive desired LED state in payload
INFO("Subscribe callback");
INFO("%.*s\t%.*s",
(int)params.TopicNameLen, params.pTopicName,
(int)params.MessageParams.PayloadLen, (char*)params.MessageParams.pPayload);
//Read the desired state from message
ret = MSG_GetDesiredState( payload_len, payload, &des_state);
if(ret !=0)
goto JSON_ERROR;
//Update current LED- and GPIO- state to the desired state
INFO("Updating state: %d\n",des_state);
SetLEDState(UserLED_4, des_state);
Write_GPIO(GPIO12, des_state);
//Write response message
char msg_payload[MAX_PAYLOAD];
payload = msg_payload;
payload_len = MAX_PAYLOAD;
LED_State led_state;
GetLEDState(UserLED_4, &led_state);
ret = MSG_SetReportedState( payload_len, payload, (int)led_state);
if(ret !=0)
goto JSON_ERROR;
char topic[512];
sprintf(topic, led_state_pub_topic, GetMachineID());
printf("Sending payload: %s", payload);
rc = MQTT_Send_Message(topic, payload, strlen(payload) );
if (NONE_ERROR != rc)
ERROR("Could not publish new LED state to topic: %s", topic );
return 0;
JSON_ERROR:
ERROR("JSON format Error! %s", (char*)params.MessageParams.pPayload);
return -1;
}
