Mqtt published acknowledged

Sorry if this question is basic but I'm still learning and really just cut and paste programming right now.

I'm looking to write an IF statement based upon a Mqtt publish acknowledged return message form the Mqtt broker.

My code is below....if anyone can help with the IF statement that will work I'd greatly appreciate

#include <OneWire.h>
#include <DallasTemperature.h>
#include <ESP8266WiFi.h>
#include <Ticker.h>
#include <AsyncMqttClient.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>

#define WIFI_SSID "WiFi-86F4"
#define WIFI_PASSWORD "75831431"

// Raspberri Pi Mosquitto MQTT Broker
#define MQTT_HOST IPAddress(192, 168, 1, 113)
// For a cloud MQTT broker, type the domain name
//#define MQTT_HOST ""
#define MQTT_PORT 1883

// Temperature MQTT Topics
#define MQTT_PUB_TEMP "esp/ds18b20/solar"

// GPIO where the DS18B20 is connected to
const int oneWireBus = 14;    //first DS18B20 (GPIO4-D2)
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);

// Pass our oneWire reference to Dallas Temperature sensor 
DallasTemperature sensors(&oneWire);

// Temperature value
float temp;

const int analogInPin = A0;  // ESP8266 Analog Pin ADC0 = A0
int sensorValue = 0;  // value read from the pot
float batteryLevel = sensorValue*(3.3/1023.0); //analogread returns a number 0-1023
// Voltage Divider Vout = (Vin*R2)/(R1+R2)  27K and 100K = Vout = (4.2*100k)/(27k + 100k) = 3.3V

AsyncMqttClient mqttClient;
Ticker mqttReconnectTimer;

WiFiEventHandler wifiConnectHandler;
WiFiEventHandler wifiDisconnectHandler;
Ticker wifiReconnectTimer;

unsigned long previousMillis = 0;   // Stores last time temperature was published
const long interval = 10000;        // Interval at which to publish sensor readings

void connectToWifi() {
  Serial.println("Connecting to Wi-Fi...");

void onWifiConnect(const WiFiEventStationModeGotIP& event) {
  Serial.println("Connected to Wi-Fi.");

void onWifiDisconnect(const WiFiEventStationModeDisconnected& event) {
  Serial.println("Disconnected from Wi-Fi.");
  mqttReconnectTimer.detach(); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
  wifiReconnectTimer.once(2, connectToWifi);

void connectToMqtt() {
  Serial.println("Connecting to MQTT...");

void onMqttConnect(bool sessionPresent) {
  Serial.println("Connected to MQTT.");
  Serial.print("Session present: ");

void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
  Serial.println("Disconnected from MQTT.");

  if (WiFi.isConnected()) {
    mqttReconnectTimer.once(2, connectToMqtt);

/*void onMqttSubscribe(uint16_t packetId, uint8_t qos) {
  Serial.println("Subscribe acknowledged.");
  Serial.print("  packetId: ");
  Serial.print("  qos: ");

void onMqttUnsubscribe(uint16_t packetId) {
  Serial.println("Unsubscribe acknowledged.");
  Serial.print("  packetId: ");

void onMqttPublish(uint16_t packetId) {
  Serial.print("Publish acknowledged.");
  Serial.print("  packetId: ");

void setup() {

  // read the analog in value
  sensorValue = analogRead(analogInPin);
 delay (250);
  // print the readings in the Serial Monitor
  Serial.print("sensor = ");

  batteryLevel = (sensorValue*(3.3/1023.0))-0.15;   //-0.15 is an offset .Corrected to a measured value on DMV

  Serial.print("Battery Level = ");


  wifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnect);
  wifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnect);

  mqttClient.setServer(MQTT_HOST, MQTT_PORT);
  // If your broker requires authentication (username and password), set them below
  //mqttClient.setCredentials("REPlACE_WITH_YOUR_USER", "REPLACE_WITH_YOUR_PASSWORD");
  delay (5000); 

if (WiFi.isConnected()) {
    // Temperature in Celsius degrees
    temp = sensors.getTempCByIndex(0);
    // Publish an MQTT message on topic esp/ds18b20/solar
    uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(batteryLevel).c_str());                            
    Serial.printf("Publishing on topic %s at QoS 1, packetId: %i ", MQTT_PUB_TEMP, packetIdPub1);
    Serial.printf("Message: %.2f \n", temp);

ESP.deepSleep(20e6); // 1.8e9 is 30 minutes, 6e7 is 60 seconds in microseconds take into account other delays above


void loop() 





Make a new tab and call it secerts.h and put these things in it

#define WIFI_SSID "WiFi-86F4"
#define WIFI_PASSWORD "75831431"

Include the h file in your project and when you post your code your password is a variable names WhatEverMan and your user name is UIdaKnow.

Before connecting to WiFi issue a WiFI.disconnect(), which does 2 things. If connected, disconnects, and sets the WiFi stack space to its default values.

If you are expecting a return message then you will need to run client.loop()

    Important to not set vTaskDelay to less then 10. Errors begin to develop with the MQTT and network connection.
    makes the initial wifi/mqtt connection and works to keeps those connections open.
void MQTTkeepalive( void *pvParameters )
  sema_MQTT_KeepAlive   = xSemaphoreCreateBinary();
  xSemaphoreGive( sema_MQTT_KeepAlive ); // found keep alive can mess with a publish, stop keep alive during publish
  // setting must be set before a mqtt connection is made
  MQTTclient.setKeepAlive( 90 ); // setting keep alive to 90 seconds makes for a very reliable connection, must be set before the 1st connection is made.
  for (;;)
    //check for a is-connected and if the WiFi 'thinks' its connected, found checking on both is more realible than just a single check
    if ( (wifiClient.connected()) && (WiFi.status() == WL_CONNECTED) )
      xSemaphoreTake( sema_MQTT_KeepAlive, portMAX_DELAY ); // whiles MQTTlient.loop() is running no other mqtt operations should be in process
      xSemaphoreGive( sema_MQTT_KeepAlive );
    else {
      log_i( "MQTT keep alive found MQTT status %s WiFi status %s", String(wifiClient.connected()), String(WiFi.status()) );
       if ( !(wifiClient.connected()) || !(WiFi.status() == WL_CONNECTED) )
    vTaskDelay( 250 ); //task runs approx every 250 mS
  vTaskDelete ( NULL );

The task, above, is the one that makes a WiFi connection, and makes a mqtt connection, and runs client.loop(), MQTTclient.loop();.

Note the line MQTTclient.setKeepAlive( 90 ); , which must be issued prior to making a MQTT connection, greatly improves maintaining a MQTT connection.

Here is a MQTT connection that I use

void connectToMQTT()
  // create client ID from mac address
  byte mac[5];
  WiFi.macAddress(mac); // get mac address
  //log_i( "mac address %d.%d.%d.%d.%d", mac[0], mac[1], mac[2], mac[3], mac[4]  );
  String clientID = String(mac[0]) + String(mac[4]) ; // use mac address to create clientID
  log_i( "connect to mqtt as client %s", clientID );
  while ( !MQTTclient.connected() )
    MQTTclient.connect( clientID.c_str(), mqtt_username, mqtt_password );
    //log_i( "connecting to MQTT" );
    vTaskDelay( 250 );
  MQTTclient.setCallback( mqttCallback );
  MQTTclient.subscribe( topicOK );
  //log_i("MQTT Connected");
void connectToWiFi()
  int TryCount = 0;
  //log_i( "connect to wifi" );
  while ( WiFi.status() != WL_CONNECTED )
    WiFi.begin( SSID, PASSWORD );
    //log_i(" waiting on wifi connection" );
    vTaskDelay( 4000 );
    if ( TryCount == 10 )
  //log_i( "Connected to WiFi" );
  WiFi.onEvent( WiFiEvent );
} // void connectToWiFi()

Oh, I forgot to add that I tried this #include <AsyncMqttClient.h>. After receiving a Guru Meditation error I went back to PubSubClient.

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