ESP32 Forum

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#include <AWS_IOT.h>
#include <WiFi.h>
...
int double_vprintf(const char *fmt, va_list args) {

	if (hornbill.publish(TOPIC_NAME,"Static payload") == 0) {
		Serial.println("Printing from double_vprintf()");
	} else {
	Serial.println("hornbill.publish failed from the vprintf() ");
	};
	Serial.println("Printing from doubel_vprintf");
	return vprintf(fmt, args);
}
...
void setup() {
...
if(0 == hornbill.subscribe(TOPIC_NAME,mySubCallBackHandler)) {
			ESP_LOGI(TAG,"Registering double_vprint() ");
			esp_log_set_vprintf(&double_vprintf);
			ESP_LOGI(TAG,"Subscribe Successful");
//			Serial.println("Subscribe Successful");
		} else {
			ESP_LOGE(TAG,"Subscribe Failed, Check the Thing Name and Certificates");
//			Serial.println("Subscribe Failed, Check the Thing Name and Certificates");
			while(1);
		}
...
}
oid loop() {

	if(msgReceived == 1) {
		msgReceived = 0;
		Serial.print("Received Message:");
		Serial.println(rcvdPayload);
	}
	if(tick >= 5) { // publish to topic every 5seconds
		tick=0;
		sprintf(payload,"Hello from hornbill ESP32 : %d",msgCount++);
		if(hornbill.publish(TOPIC_NAME,payload) == 0) {
			ESP_LOGI(TAG,"Publish Message: %s",payload);
			Serial.print("Publish Message:");
			Serial.println(payload);
		} else {
			ESP_LOGI(TAG,"Publish failed");
			Serial.println("Publish failed");
		}
	}
	vTaskDelay(1000 / portTICK_RATE_MS);
	tick++;
}