IOS Unity player hangs in kcp transport if call HostDiscovery.StopDiscovery() when switch back from background about mirror

[MrGadget1024]

Need to know more about your setup. Are offline / online scenes assigned to Network Manager?

You don't need that if...else if...else if block...just call NetworkManager.singleton.StopHost(); and Mirror will do the right thing for all cases.

StopDiscovery should already be called automatically as soon as a client connects to a discovered server, so you shouldn't need to call that.

[Tunied]

Hi

thanks for the advice . still new to Mirror :)

and i don't use offline / online scenes. i use my own scene switch logic.

my game can play as single or multiplayer.

for the host part. the scene switch flow is same.

Lobby -> Game Scene

• start Mirror as Host

• do some stuff before scene swithch

• call SceneManager.LoadScene(xxx, LoadSceneMode.Single);

• do some stuff after scene switch

---

Game Scene -> Lobby

• stop Mirror

• do some stuff before scene swithch

• call SceneManager.LoadScene(xxx, LoadSceneMode.Single);

• do some stuff after scene switch

this forzen issue is happen in the first step, when i try to stop Mirror.

there are two things maybe relate to this issue

first. currently i don't have the permission to use "com.apple.developer.networking.multicast" (still waiting for permission from Apple)

secondly. HostDiscovery.StartDiscovery() is not been called

• in my game logic , HostDiscovery.StartDiscovery only called when player try to join the host.

• and as the "scene switch" part logic it's a common feature in my game. so i call it each time when try to switch scene.

[MrGadget1024]

Mirror has overrides in Network Manager for OnServerChangeScene (before) and OnServerSceneChanged (after), as well as OnClientChangeScene (before) and OnClientSceneChanged (after) that would likely suite your needs, and setting offline and online scenes does some work under the hood when you call Stop/Start Server/Host/Client, and network Manager's ServerChangeScene ensures clients all change with the server without message errors.

For Discovery, Server would call AdvertiseServer when started and you'd call StopDiscovery before calling StopHost. Client would call StartDiscovery (StopDiscovery is auto-called for client when it connects).

[Tunied]

Hi

thank very much your advice.

I think there should be something wrong with my code.

just make a small suggestion:

Should a warning or error be added to kcp2k or HostDiscovery ? (i still don't know what exactly triggered this problem :( )

this can help users better locate the problem.

It took me a long time to locate this bug.

The main reason is that this bug is very hidden. It only appears on IOS devices. And it can only be triggered after the screen is turned off.

Even if the app is switched repeatedly without turning off the screen, it will still not be triggered.

Just a small suggestion from me.

I wish Mirror all the best!