Arduino esp32 Wifi status says connected only can't ping it

Using Arduino Programming Questions
#1

I’m using an esp32 to connect to an wifi network. I am also using an static ip an next to the acces point i can connect to the wifi network. If i go further from the acces point at a point where my laptop and smartphone don’t have an problem connecting to the wifi network the esp32 does have a problem. Wifi.status() returns code 3 that says WL_CONNECTED. Only while pinging the IP or trying to access an webpage I received times out. Any reasons for that?

Here is the code i’m using. The wifi part is important, the rest of the code for communication and NTC measurement to degree is not relevant for this post.

 #include <WiFi.h>

WiFiServer wifiServer(80);
String Wifi_read;

// Wifi settings
const char *ssid = "NETWORK_NAME";
const char *password = "NETWORK_PASSWORD";
IPAddress local_IP(10,0,0,93);
IPAddress gateway(10,0,0,138);
IPAddress subnet(255,255,255,0);
int Wifi_led = 2;
int Wifi_status;

// given data
const int ADC_resolution = 4095;
const float VCC = 3.3;

//Settings
int Average_readings = 299; // Starting at 0

//Timers
unsigned long currenttime;
unsigned long nexttime = 0;
int interval = 125;
unsigned long Wifi_nexttime = 0;
int Wifi_interval = 125;
unsigned long check_wifi = 10000;


// NTC_1 variables
int NTC_1 = 34;
const int Resistor_1 = 9986;
float ADC_value_1;
float Voltage_1;
float NTC_R_raw_1;
float NTC_R_avg_1;
float NTC_array_1[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,};
int Array_1 = 0;
float T01;
int T01_low;
int T01_high;

// NTC_2 variables
int NTC_2 = 35;
const int Resistor_2 = 9986;
float ADC_value_2;
float Voltage_2;
float NTC_R_raw_2;
float NTC_R_avg_2;
float NTC_array_2[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0,};
int Array_2 = 0;
float T02;
int T02_low;
int T02_high;
float Delta_t;

// values voor lookup table
float value[] = 
{32869, 31229, 29680, 28217, 26834, 25527, 24291, 23122, 22015, 20968,  // 0 t/m 9 degree
19977, 19038, 18149, 17306, 16507, 15750, 15032, 14350, 13703, 13090,   // 10 t/m 19 degree
12507, 11953, 11427, 10927, 10452, 10000, 9570, 9161, 8772, 8402,       // 20 t/m 29 degree
8049, 7713, 7393, 7088, 6798, 6521, 6256, 6004, 5764, 5534,             // 30 t/m 39 degree
5315, 5106, 4906, 4715, 4533, 4358, 4191, 4032, 3879, 3733,             // 40 t/m 49 degree
3594, 3460, 3332, 3210, 3092, 2980, 2872, 2768, 2669, 2574,             // 50 t/m 59 degree
2483, 2396, 2312, 2231, 2154, 2080, 2009, 1940, 1874, 1811,             // 60 t/m 69 degree
1750, 1692, 1636, 1582, 1530, 1480, 1431, 1385, 1340, 1298,             // 70 t/m 79 degree
1256, 1216, 1178, 1141, 1105, 1071, 1038, 1006, 975, 945,               // 80 t/m 89 degree
916, 889, 862, 836, 811, 787, 764, 741, 720, 699,                       // 80 t/m 89 degree
678, 659, 640, 622, 604, 587, 570, 554, 539, 524,                       // 90 t/m 99 degree
509, 495, 481, 468, 455, 443, 431, 419, 408, 397,                       // 100 t/m 109 degree
386, 376, 366, 357, 347, 338};                                           // 110 t/m 115 degree

int value_number;



void setup() { 
  Serial.begin(115200);
  pinMode(Wifi_led, OUTPUT);

  if (!WiFi.config(local_IP, gateway, subnet))  
  { Serial.println("STA Failed to configure");  }
  
  WiFi.begin(ssid, password);
  wifiServer.begin();
}

void loop() {
WiFiClient client = wifiServer.available();
currenttime = millis();
Wifi_indication();
Wifi_labview();

if (currenttime >= nexttime)  {
  nexttime += interval;
  Temps();
  Serial.println(WiFi.status());
}
}

void Temps() {
  Temps_T01();
  Wifi_labview();
  Temps_T02();
  Wifi_labview();
  Temps_Delta_t();
  Wifi_labview();
}

void Temps_T01()  {
// T01
  // Reading the analog value
  ADC_value_1 = analogRead(NTC_1); // Reading the ADC value
  Voltage_1 = (ADC_value_1 * VCC) / ADC_resolution;
  NTC_R_raw_1 = Resistor_1 / (VCC - Voltage_1) * Voltage_1;

  // Smoothing the resistance value 
  NTC_array_1[Array_1] = NTC_R_raw_1;
  Array_1 += 1;
  if (Array_1 > Average_readings) {Array_1 = 0;}
  NTC_R_avg_1 = 0;
  for (int i = 0; i < Average_readings;)  {
    NTC_R_avg_1 += NTC_array_1[i];
    i++;
  }
  NTC_R_avg_1 = NTC_R_avg_1 / Average_readings;
  if (NTC_array_1[Average_readings] == 0 or NTC_R_raw_1 <= 500) { NTC_R_avg_1 = 0; }
  
  // making an temperatur with decimals 
  value_number = 0;
  while (value[value_number] >= NTC_R_avg_1) {
    T01_low = value_number;
    value_number++;
  }
  T01_high = value_number;
  T01 = T01_low + (1 - ((T01_high - T01_low) / (value[T01_low] - value[T01_high]) * (NTC_R_avg_1 - value[T01_high])));
}

void Temps_T02()  {
// T02
  // Reading the analog value
  ADC_value_2 = analogRead(NTC_2); // Reading the ADC value
  Voltage_2 = (ADC_value_2 * VCC) / ADC_resolution;
  NTC_R_raw_2 = Resistor_2 / (VCC - Voltage_2) * Voltage_2;

  // Smoothing the resistance value 
  NTC_array_2[Array_2] = NTC_R_raw_2;
  Array_2 += 1;
  NTC_R_avg_2 = 0;
  if (Array_2 > Average_readings) {Array_2 = 0;}
  for (int i = 0; i < Average_readings;)  {
    NTC_R_avg_2 += NTC_array_2[i];
    i++;
  }
  NTC_R_avg_2 = NTC_R_avg_2 / Average_readings;
  if (NTC_array_2[Average_readings] == 0 or NTC_R_raw_2 <= 500) { NTC_R_avg_2 = 0; }
  
  // making an temperatur with decimals 
  value_number = 0;
  while (value[value_number] >= NTC_R_avg_2) {
    T02_low = value_number;
    value_number++;
  }
  T02_high = value_number;
  T02 = T02_low + (1 - ((T02_high - T02_low) / (value[T02_low] - value[T02_high]) * (NTC_R_avg_2 - value[T02_high])));
}

void Temps_Delta_t()  {
//Delta T
  Delta_t = T01 - T02;
}

void Wifi_indication() {
  if (WiFi.status() != WL_CONNECTED) {
    if (currenttime >= Wifi_nexttime)  {
      Wifi_nexttime += Wifi_interval;
      if (Wifi_status == HIGH) 
      { Wifi_status = LOW;  }
      else  
      { Wifi_status = HIGH; }
      delay(100);
    }

     if (currenttime > check_wifi)  {
      WiFi.disconnect();
      WiFi.begin(ssid, password);
      check_wifi = currenttime + 30000;
      Serial.println("Restarting wifi connection");
    }
    
   }
   else  
   {  Wifi_status = HIGH; }
   digitalWrite(Wifi_led, Wifi_status);

  
}

void Wifi_labview() {
WiFiClient client = wifiServer.available();
  if (client.connected()) {
    while (client.available() > 0)  {
      char a = client.read();
      Wifi_read += a;
    }
  }

  if (Wifi_read == "Read")  {
    client.print("T01: ");
    client.print(T01);
    client.print("\t");
    client.print("T02: ");
    client.print(T02);
    client.print("\t");
    client.print("DeltaT: ");
    client.println(Delta_t);   
  }
  
  Wifi_read = "";
}
#2

Check out the size of the WiFi antenna in your laptop and in your phone. Compare them to the the tiny antenna in the ESP32. It is not reasonable to expect to be able to connect the laptop, the phone, and the ESP32 to the WiFi access point, from the same distance away.

So, forget about comparing results of the laptop, the phone, and the ESP32, and tell us what the problem is. Unless it is just a range issue, which is perfectly reasonable.

#3

Yeah it makes sense that i can't compare the WiFi range of the ESP32 chip with an laptop or smartphone. Only the WiFi.status() command return an 3 witch means WL_connected. Where i would expect that i would be able to ping or receive TCP messages back. And at the moment i don't receive something from the ESP32.

I'm suspecting an range issue only i can't links the Wifi.status() status says connected and i ain't able to communicate with the ESP32. That's where my confusing is coming from. Any idea's on that will be appreciated.

#4