I experienced similar messages when I had multiple versions of Arduino installed with different library sets. There may be a way to limit where the compiler searches and loads libraries from, but I opted to remove all except for my most current Arduino setup to keep it simple and avoid library confusion. (Hope this helps…)

Hi.
That is probably happening because you don’t have a loop() in your code.
Verify that you have a loop() function in your code.
Regards,
Sara

SDBURTON – Thanks for the suggestion. I tried what you suggested, but I still have the problem. It did help with other sketches though and I thank you for that.

Sara – My code has a loop() function so, unfortunately, that did not work. Thanks for the suggestion.

Rui – Below is my sketch. I am using a MODEMCU ESP-32S board, my “Boards” and my “Libraries” are all up to date. I am using Arduino-1.8.12.

Thanks everyone for your suggestions and your help.

Garland

[code]
/*
This sketch,PIR cloudMQTT XMIT, is designed to send a signal via RF when a PIR senses a person.

Created 15 Jun 2019
by Garland Sparks
This code is in the public domain.

*/

// Loading the required libraries
#include
#include
#include

// Define PIM pin
#define Pin17 17

// esp32 connects to your router
EspMQTTClient client();
const char* ssid = “dd-wrt”; //”PGC”;
const char* password = “******”; //”*******”;

// Connect to the cloudMQTT
const char* mqttServer = “m16.cloudmqtt.com”;
const int mqttPort = 12202;
const char* mqttUser = “32xmit”; //This receiver module
const char* mqttPassword = “*********”; // Password
//”32xmitUser”, // Client name
//12202 // MQTT port

void setup() {
delay(10);
Serial.println();
Serial.begin(115200);
Serial.print(“Connecting to “);
Serial.println(ssid);
WiFi.begin(“ssid”, “password”);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(“.”);
}
randomSeed(micros());
Serial.println(“”);
Serial.println(“WiFi connected”);
Serial.println(“IP address: “);
Serial.println(WiFi.localIP());
}

void reconnect() {
// Loop until we’re reconnected
if ( WiFi.status() != WL_CONNECTED) {
while (WiFi.begin(“ssid”, “password”) != WL_CONNECTED) {
// unsuccessful, retry in 4 seconds
Serial.print(“failed … “);
delay(4000);
Serial.print(“retrying … “);
}
}
}
/*while (!client.connected()) {
Serial.print(“Attempting MQTT connection…”);
// Create a random client ID
String clientId = “ESP32Client-“;
clientId += String(random(0xffff), HEX);
// Attempt to connect

if (client.connect(clientId_str(),MQTT_USER,MQTT_PASSWORD)) {
Serial.println(“Connected”);
WiFi.begin(“ssid”, “password”);
digitalWrite(0, LOW);
digitalWrite(2, HIGH);
} else {
*/

void callback(char* topic, byte *payload, unsigned int length) {
Serial.println(“——-new message from broker—–“);
Serial.print(“channel:”);
Serial.println(topic);
Serial.print(“data:”);
Serial.write(payload, length);
Serial.println();
}

client.enableHTTPWebUpdater();

//Define that Pin17 is an input
pinMode(Pin17, INPUT);
}

//Establish that there is a connection with cloudMQTT
void onConnectionEstablished(){
client.publish(“esptest”,”hello”);
Serial.println(“Contact is established”);
}

void Action(){
char* messageTemp = “2”;
delay(3*1000);
//Read the value of Pin17 Output
int PinVal=digitalRead(Pin17);

Serial.print(“Pin ‘In’ Value =”);
Serial.println(PinVal);

//The following is the logic that tells the receiver to do something
if(PinVal == 1){
messageTemp = “1”;
client.publish(“esptest”, “1”);
Serial.print(“Message to Send “);
Serial.println(PinVal);
digitalWrite(Pin17,HIGH);
}else{
//read value of Pin17 input;
PinVal=digitalRead(Pin17);
if(PinVal== 0){
messageTemp=”0”;
client.publish(“esptest”, “0”);
Serial.print(“Message= “);
Serial.println(PinVal);
digitalWrite(Pin17, LOW);
}
}
}

void loop(){
client.loop();
Action();
delay(3000);
}
*/
[/code]