client.isActive() returns true while device wi-fi is off

[zigzagg16]

Describe the bug
I can't find a simple way to check the session connectivity.
Playing with the iPad's wifi connection, I should get disconnection events, but not.
Also when wifi is off, client.isActive returns true

To Reproduce

my listener:

closeListenerTask = Task {
	let listener = client.addCloseListener(named: "closeListener") { result in
		switch result {
			case .success:
				// connected
			case .failure(let error):
				//disconnected with error
		}
	}
}

Expected behavior
When the wifi goes off (or device looses connection in general), I should receive connection/disconnection events

Context (please complete the following information):

• Platform iPad OS 18.6
• Swif Version: 5.9
• Xcode Version 16.4

[adam-fowler]

Which EventLoopGroup type are you using?

[zigzagg16]

I'm using a NIOTSEventLoopGroup(). Should I use another one in that case ?

[zigzagg16]

@adam-fowler looking better with this setup :

static let eventLoopGroup = NIOTSEventLoopGroup.singletonNIOTSEventLoopGroup

MQTTNIO.MQTTClient(
					host: configuration.host,
					port: Int(configuration.port),
					identifier: configuration.clientID,
					eventLoopGroupProvider: .shared(Self.eventLoopGroup), ...

however if another setup is recommended on iOS to catch network loss, please let me know.

[adam-fowler]

No NIOTSEventLoopGroup is the correct one as it uses the Network framework.

I seem to remember someone else having a similar issue a couple of years back. I cannot remember how it got resolved and can't find anything in the GitHub issues.

EDIT: Found it, sorry nothing came of it. The Network framework keeps a connection open, for a grace period of time when connectivity is lost so it can resurrect it again if it re-gains wifi or a cellular connection. If you bring the wifi back up the connection with your mqtt server should continue to work. Given the connection has not closed MQTTClient does not report it as closed. So you cannot use MQTTNIO to report on connectivity.

Alternatively you can use NWPathMonitor to monitor changes to your connectivity. This will report on if you have wifi, cellular or no connection