When using multiple playback dolphins, every SlippiSpectateServer after the first fails to start

[jmlee337]

this is because there is no mechanism to try a different port then the default (there also doesn't appear to be any way to change the default):

Ishiiruka/Source/Core/Core/Slippi/SlippiSpectate.cpp

Lines 281 to 302 in 18ee345

	server_address.port = SConfig::GetInstance().m_spectator_local_port;
	// Create the spectator server
	// This call can fail if the system is already listening on the specified port
	// or for some period of time after it closes down. You basically have to just
	// retry until the OS lets go of the port and we can claim it again
	// This typically only takes a few seconds
	ENetHost *server = enet_host_create(&server_address, MAX_CLIENTS, 2, 0, 0);
	int tries = 0;
	while (server == nullptr && tries < 20)
	{
	server = enet_host_create(&server_address, MAX_CLIENTS, 2, 0, 0);
	tries += 1;
	std::this_thread::sleep_for(std::chrono::milliseconds(1000));
	}
	if (server == nullptr)
	{
	WARN_LOG(SLIPPI, "Could not create spectator server");
	enet_deinitialize();
	return;
	}

adding an Ishii command-line option to set the SlippiSpectateServer port would alleviate this problem

[vladfi1]

Note that you can set this in Dolphin.ini:

[Core]
SlippiEnableSpectator=True
SlippiSpectatorLocalPort=12345