Can't send data through UDP via Wi-Fi, Returning 0 Bytes sent

I want to send data to esp32 via WiFi using UDP, but it'S returning 0 bytes (as 0 bytes sent)

For Esp32 I tried with another device (different mobile app), and it's working fine.(Esp32 is OK)

Here is my code for sending data:

Future<void> sendMessage(String message) async {
  try {
    sender = await UDP.bind(
      Endpoint.any(port: const Port(4210)),
    );
    final data = Uint8List.fromList(utf8.encode(message));
    final endpoint = Endpoint.unicast(
      InternetAddress("192.168.4.1"),
      port: const Port(3333),
    );
    final sent = await sender!.send(data, endpoint);
    print("Sent $sent bytes: '$message'");
  } catch (e) {
    print('Error sending UDP message: $e');
  }
}

And here are my manifest persmissions:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Additionaly anything more needed?

What could be the reason for this issue?

I tried in different mobile apps, that works fine, also tried in Linux terminal using netcat.