private void Search(UdpClient client)
{
nextSearch = DateTime.Now.AddSeconds(SearchPeriod);
byte[] data = DiscoverDeviceMessage.Encode();
// UDP is unreliable, so send 3 requests at a time (per Upnp spec, sec 1.1.2)
for (int i = 0; i < 3; i++)
{
client.Send(data, data.Length, searchEndpoint);
}
}
private void Search(UdpClient client)
{
// Sort out the time for the next search first. The spec says the
// timeout should double after each attempt. Once it reaches 64 seconds
// (and that attempt fails), assume no devices available
nextSearch = DateTime.Now.AddMilliseconds(timeout);
timeout *= 2;
// We've tried 9 times as per spec, try searching again in 5 minutes
if (timeout == 128 * 1000)
{
timeout = 250;
nextSearch = DateTime.Now.AddMinutes(10);
return;
}
// The nat-pmp search message. Must be sent to GatewayIP:53531
byte[] buffer = new byte[] { PmpConstants.Version, PmpConstants.OperationCode };
foreach (IPEndPoint gatewayEndpoint in gatewayLists[client])
{
client.Send(buffer, buffer.Length, gatewayEndpoint);
}
}
