ESP8266 webclient alway freeze when

Projects Programming
1

I use ESP8266 read data from http like this code.

ESP8266WiFiMulti WiFiMulti;
String payload, getData;
unsigned long unix_epoch;

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");

void setup() {

  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200);

  for (uint8_t t = 4; t > 0; t--) {
    Serial.printf("[SETUP] WAIT %d...\n", t);
    Serial.flush();
    delay(1000);
  }

  WiFi.mode(WIFI_STA);
  WiFiMulti.addAP("NetworkWiFi", "123456789");

  // Initialize a NTPClient to get time
  timeClient.begin();
  const long offsetTime = 25200;       // 7*60*60 = 25200
  timeClient.setTimeOffset(offsetTime);

}

void readData(){
    
  WiFiClient client;
  HTTPClient http;
    
  Serial.print("[HTTP] begin...\n");

  if (http.begin(client, "http://192.168.10.80/device/?key=001")) {  // HTTP
      Serial.print("[HTTP] GET...\n");
      // start connection and send HTTP header
      int httpCode = http.GET();

      // httpCode will be negative on error
      if (httpCode > 0) {
        // HTTP header has been send and Server response header has been handled
        Serial.printf("[HTTP] GET... code: %d\n", httpCode);

        // file found at server
        if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
          payload = http.getString();
          Serial.println(payload);
        }
      } else {
        Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
      }

      http.end();
    } else {
      Serial.printf("[HTTP} Unable to connect\n");
    }

    DynamicJsonDocument doc(1024); 
    deserializeJson(doc, payload);
    
    JsonArray root_0 = doc[0];
    JsonArray root_1 = doc[1];
    
    bool st = root_0[1];
    
    timeClient.update();
    unix_epoch = timeClient.getEpochTime();   // get UNIX Epoch time

      bool t;
      t = st;
      Serial.println(t);
      
      if(t==1){
              digitalWrite(LED_BUILTIN, HIGH);
      }else{
              digitalWrite(LED_BUILTIN, LOW);
      }
}

void loop() {

  if ((WiFiMulti.run() == WL_CONNECTED)) {
    
    readData();

  } 

  delay(3000);

}

I can turn ON/OFF LED_BUILTIN by read status from http in this line bool st = root_0[1]; . The program work for some hour. If I open ESP8266 more than 12 hour then ESP8266 will freeze I can't turn ON/OFF LED_BUILTIN. How to fix it?

2

try with DynamicJsonDocument doc(1024); as global variable

3

What is the last page in Serial Monitor when the sketch has frozen?

4

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