Non-nullable field '_cts' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Make 'HandleClientAsync' a static method. (https://rules.sonarsource.com/csharp/RSPEC-2325)

Make sure that using this pseudorandom number generator is safe here. (https://rules.sonarsource.com/csharp/RSPEC-2245)

Fix this implementation of 'IDisposable' to conform to the dispose pattern. (https://rules.sonarsource.com/csharp/RSPEC-3881)

Make '_cancellationTokenSource' 'readonly'. (https://rules.sonarsource.com/csharp/RSPEC-2933)

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Non-nullable field '_listener' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of parameter 'state' of 'void UdpTimedSender.SendMessageCallback(object state)' doesn't match the target delegate 'TimerCallback' (possibly because of nullability attributes).

Non-nullable field '_timer' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.