private void PrepareResponse(Request request)
{
// consecutive response require new MID that must be stored for RST matching
if (request.Response.ID == Message.InvalidID)
{
request.Response.ID = MessageLayer.NextMessageID();
}
// 16-bit second counter
Int32 secs = (Int32)((DateTime.Now - request.StartTime).TotalMilliseconds / 1000) & 0xFFFF;
request.Response.SetOption(Option.Create(OptionType.Observe, secs));
// store ID for RST matching
UpdateLastMessageID(request.PeerAddress.ToString(), request.UriPath, request.Response.ID);
}
