Small ESP8266 program that sends a message over MQTT and then goes into deep sleep until woken up again.

dashMQTT.ino

/*    
    dashMQTT.ino
    Copyright (c) 2017 ItKindaWorks All right reserved.
    github.com/ItKindaWorks

    dashMQTT.ino is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    dashMQTT.ino is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with dashMQTT.ino.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "ESPHelper.h"
#include "Metro.h"

//setup macros for time
#define SECOND  1000L
#define MINUTE  SECOND * 60L
#define HOUR  MINUTE * 60L

//hostname for ESPHelper/OTA
const char* otaPassword = "OTA_PASSWORD";
const char* netHostName = "YOUR-HOSTNAME";
const char* postTopic = "/some/topic";
const char* payload = "1";

//timers for turn off
Metro minRun = Metro(1 * MINUTE);
Metro maxRun = Metro(5 * MINUTE);

//ESPHelper
netInfo homeNet = { .mqttHost = "YOUR MQTT-IP",     //can be blank if not using MQTT
          .mqttUser = "YOUR MQTT USERNAME",   //can be blank
          .mqttPass = "YOUR MQTT PASSWORD",   //can be blank
          .mqttPort = 1883,         //default port for MQTT is 1883 - only chance if needed.
          .ssid = "YOUR SSID", 
          .pass = "YOUR NETWORK PASS"};

ESPHelper myESP(&homeNet);

//done keeps track of whether the device has finished the task
bool done = false;

void setup() {
	
  //setup OTA
	myESP.OTA_enable();
	myESP.OTA_setPassword(otaPassword);
	myESP.OTA_setHostnameWithVersion(netHostName);


	// myESP.enableHeartbeat(2);		//07 / 12E ledPin
	myESP.enableHeartbeat(1);		//01 ledPin

	myESP.begin();
	myESP.setCallback(callback);
}

void loop(){

	if(myESP.loop() == FULL_CONNECTION && !done){

      //publish message to MQTT
			myESP.publish(postTopic, payload, false); 

      //mark as done so we dont constantly spam the message until sleeping
			done = true;

	}

  	//send the ESP to deep sleep (to be woken up by pulling rst low)
	if((minRun.check() && done) || maxRun.check()){
		ESP.deepSleep(0, WAKE_RF_DEFAULT);
	} 

	yield();
}

void callback(char* topic, uint8_t* payload, unsigned int length) {

}