Bonjour and SwiftNIO - is it possible with NIO Transport Services?

[idolize]

I'm trying to do something similar to the poster of this topic.

However I'm only interested in a connection between a macOS server and an iOS client, so using Network.framework is a possibility for me.

---

Currently I am using a NWListener to register my service for the iOS client to discover using NWBroswer.

This works, and I get a NWConnection with the listener.newConnectionHandler.

listener.newConnectionHandler = { connection in
    connection.cancel()
}

But, it circumvents my SwiftNIO server in the process.

The only workarounds I've seen elsewhere require using TXT records in the Bonjour service just to tell the client the actual IP:port of the SwiftNIO service (example using a Vapor server). This seems less than ideal.

Is it possible to use NIO Transport Services to bridge this gap?

• I notice that there is a NIOTSConnectionBootstrap#withExistingNWConnection(_:) function available. Are there any examples of how to use this?
• Is there some other way to manually re-use the connection from NWConnection and bind it to a connection in SwiftNIO?

Thanks!

[lukasa (Cory Benfield)]

Yes, you can do this.

You can bind your NIOTSListenerBootstrap to a NWEndpoint. This includes a Bonjour service option, which you can use and NIOTS supports. A similar connect method exists on NIOTSConnectionBootstrap which also takes a service endpoint if you wish.

[idolize]

Thanks for the pointers!

So, in that case I wouldn't even need the NWListener? I'd just bootstrap SwiftNIO by constructing a NWEndpoint from scratch and providing my service name etc?

Edit: I had time to test this and it worked! No need for NWListener

Thanks again @lukasa! This was a huge help.