// I call this when the Lobby screen is loaded in my game
public bool ClientRunActiveDiscovery()
{
if (!SupportedOnThisPlatform)
{
return(false);
}
StopDiscovery();
// Refresh the NIC list on entry to the lobby screen, could refresh on a timer if desired
cachedIPs = IPAddressUtility.GetBroadcastAdresses();
try {
// Setup port
clientUdpClient = new UdpClient(0);
clientUdpClient.EnableBroadcast = true;
clientUdpClient.MulticastLoopback = false;
} catch (Exception e) {
Debug.LogException(e);
// Free the port if we took it
if (clientUdpClient != null)
{
NetworkDiscoveryUtility.RunSafe(() => {
ShutdownUdpClients();
});
}
return(false);
}
StartCoroutine(ClientListenCoroutine());
StartCoroutine(ClientBroadcastCoroutine());
return(true);
}
// I call this from my NetworkManage::OnStartServer
public bool ServerPassiveBroadcastGame(byte[] serverBroadcastPacket)
{
if (!SupportedOnThisPlatform)
{
return(false);
}
StopDiscovery();
try {
// Setup port
serverUdpClient = new UdpClient(m_serverBroadcastListenPort);
serverUdpClient.EnableBroadcast = true;
serverUdpClient.MulticastLoopback = false;
} catch (Exception e) {
Debug.LogException(e);
// Free the port if we took it
if (serverUdpClient != null)
{
NetworkDiscoveryUtility.RunSafe(() => {
ShutdownUdpClients();
});
}
return(false);
}
this.serverBroadcastPacket = serverBroadcastPacket;
// TODO add coroutine to refresh server stats infrequently/make external update pathway for server to update broadcast packet
StartCoroutine(ServerListenCoroutine());
return(true);
}
void OnReceivedServerResponse(DiscoveryInfo info)
{
// Validation is our capacity to decode the message, if the payload is so different we cant parse it we silently dump it!
NetworkDiscoveryUtility.RunSafe(() => {
info.unpackedData = (GameBroadcastPacket)ByteStreamer.StreamFromBytes(info.packetData);
}, false);
if (info.unpackedData != null)
{
onReceivedServerResponse(info);
}
}
IEnumerator ClientBroadcastCoroutine()
{
while (true)
{
if (clientUdpClient == null)
{
continue;
}
NetworkDiscoveryUtility.RunSafe(() => {
SendClientBroadcast();
});
yield return(new WaitForSecondsRealtime(m_ActiveDiscoverySecondInterval));
}
}
IEnumerator ClientListenCoroutine()
{
while (true)
{
yield return(new WaitForSecondsRealtime(0.3f));
if (clientUdpClient == null)
{
continue;
}
NetworkDiscoveryUtility.RunSafe(() => {
var info = ReadDataFromUdpClient(clientUdpClient);
if (info != null)
{
OnReceivedServerResponse(info);
}
});
}
}
IEnumerator ServerListenCoroutine()
{
while (true)
{
yield return(new WaitForSecondsRealtime(0.3f));
// average time for this (including data receiving and processing): less than 100 us
Profiler.BeginSample("Receive broadcast");
NetworkDiscoveryUtility.RunSafe(() => {
var info = ReadDataFromUdpClient(serverUdpClient);
if (info != null)
{
ServerOnClientBroadcast(info);
}
});
Profiler.EndSample();
}
}
public static IPAddress[] GetBroadcastAdresses()
{
// try multiple methods - because some of them may fail on some devices, especially if IL2CPP comes into play
IPAddress[] ips = null;
NetworkDiscoveryUtility.RunSafe(() => ips = GetBroadcastAdressesFromNetworkInterfaces(), false);
if (ips == null || ips.Length < 1)
{
// try another method
NetworkDiscoveryUtility.RunSafe(() => ips = GetBroadcastAdressesFromHostEntry(), false);
}
if (ips == null || ips.Length < 1)
{
// all methods failed, or there is no network interface on this device
// just use full-broadcast address
ips = new IPAddress[] { IPAddress.Broadcast };
}
return(ips);
}