Why Wemos D1 not respond after working for a while

Question

I’m trying to build a feeder machine on a pig farm by using the Infrared photoelectric switch Sensor E18-D80NK to control relay then send notifications to line and mqtt broker when it’s working. I have been testing for 2 days, it’s working normal, but third day, it’s not responding then I just press reset so it’s working again. I’m wondering it may cause by board cause it happen only one of four boards that I tasted or may be my code cause I was confused why output to line send “connected” so many times it’s should sent only one time when connected to wifi, so I’m not sure pls help.

Question

1. Why board not responding after working normal for a while.
2. Why out output to line send "connected" more than one cause I put in void setup()

Pictures

Last line output since working

All code

extra library line notification library

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <TridentTD_LineNotify.h>

const char* ssid = "Artnaseaw-2.4G";
const char* password =  "0812667120";
const char* mqttUser = "****";
const char* mqttPassword = "****";

const char* mqttServer = "******";
const int mqttPort = *****;

const char* linetoken = "********";

long lastMsg = 0;
String DataString;
int lastL=0;    

WiFiClient espClient;
PubSubClient client(espClient);

const int ACTION = D8;

const int SENSOR = D2;

const char* host = "maker.ifttt.com";
const char *privateKey = "******";
const char *event = "*****";
String value1, value2;
String postData = "";
String MachineID="A01";

void setup() {
  Serial.begin(115200);
  pinMode(SENSOR, INPUT_PULLUP);
  pinMode(ACTION, OUTPUT);

  digitalWrite(SENSOR, LOW);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi..");
  }

  Serial.println("Connected to the WiFi network");

  client.setServer(mqttServer, mqttPort);

  client.setCallback(callback);

  while (!client.connected()) { 
    Serial.println("Connecting to MQTT...");

    if (client.connect("test", mqttUser, mqttPassword )) { 

      Serial.println("connected");

    } else {

      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);

    }
  }


  client.subscribe("command");  
  LINE.setToken(linetoken);
  LINE.notify("Connected");
  Serial.println("line send connected");
}

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

  Serial.print("Message arrived in topic: ");
  Serial.println(topic);

  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
  Serial.println("-----------------------");

}


void loop() {
  client.loop();

  delay(5000);

  int sensorValue = digitalRead(SENSOR);

     long now = millis();
  if (now - lastMsg > 60000) 
  {
    lastMsg = now;

    int sensorValue = digitalRead(SENSOR);
  if (sensorValue == LOW){
    Serial.println(" === Obstacle detected");
    Serial.print(" realy OFF ");
    digitalWrite(ACTION,LOW);
  } else {
     LINE.notify("send data to line ---working");
     Serial.println(" === All Clear");
     Serial.println(" relay ON ");
     digitalWrite(ACTION,HIGH);
     sendMessageToIFTTT();
     sendSensorToMQTT();
    }
  }
}
void sendSensorToMQTT(){
  char msg[100];
  int count = 1;
  DataString = "e18,location=test detest="+String(count);
  DataString.toCharArray(msg, 100);
  Serial.print("Publish message: ");
  Serial.println(msg);
  client.publish("e18", msg);   
}

void sendMessageToIFTTT(){

  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }

  String url = "/trigger/";
  url += event;
  url += "/with/key/";
  url += privateKey;

  value1 = "Worked";
  value2 = "1";

  genJSonObject();

  Serial.print("Requesting URL: ");
  Serial.println(url);
  Serial.println(postData);
  
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n");

  client.println("Content-Type: application/json");
  client.print("Content-Length: ");
  client.println(postData.length());
  client.println();
  client.println(postData);
  client.println("Connection: close\r\n\r\n");

  while (client.connected())
  {
    if (client.available())
    {
      String line = client.readStringUntil('\r');
      Serial.print(line);
    } else {
      // No data yet, wait a bit
      delay(50);
    };
  }
}


void genJSonObject()
{
  postData = "{";

  postData.concat("\"value1\":\"");
  postData.concat(value1);


  postData.concat("\",");
  postData.concat("\"value2\":\"");
  postData.concat(value2);

  postData.concat("\"}");
}

Answer 1

Try to connect to another mqtt broker and see if it connects more than once in there too. If it happens the problem might be in the sketch. Otherwise, the cause may be with the IFTTT service.