private static async Task DoPingPong(PingPong <PingRequest> .PingPongClient client, int requestNum, string payload, UInt16 delay)
{
var request = new PingRequest {
Payload = payload, DelayMilliseconds = delay
};
IMessage <PingResponse> response = await client.PingAsync(request);
Console.WriteLine($"Request #{requestNum} response: \"{response.Payload.Deserialize().Payload}\". Delay: {delay}");
}