Support online port checkers #2160
Description
Describe the issue
Users want to verify they port forwarded correctly by using port checkers. Add a view to the launcher for users to test a port is open.
After implementation, verify by using some port checkers like:
- https://www.ipvoid.com/udp-port-scan/
- https://pentest-tools.com/network-vulnerability-scanning/udp-port-scanner-online-nmap
For port checkers to work, use your public IP: https://ipv4.icanhazip.com/
Proof of concept
Following code should show Open status in port checkers for port 11000 UDP.
using UdpClient client = new(new IPEndPoint(IPAddress.Any, 11000));
Console.WriteLine("Ready to receive stuff!");
while (true)
{
var result = await client.ReceiveAsync();
Console.WriteLine($"{result.RemoteEndPoint} - {result.Buffer.Length} bytes: {BitConverter.ToString(result.Buffer).Replace('-', '\0')}");
await client.SendAsync(result.Buffer, result.Buffer.Length, result.RemoteEndPoint);
}