Using Combine, SwiftUI and Multipeer Networking

Hi,

I'm just getting into using Combine with SwiftUI to update state. I have a test app I'm using to build a UI around Multipeer Networking. My Swift is a little rusty currently.

Here's some code to show the context of my problem...

Here's my controller object that for now handles the session, browser and advertiser. It's a BindableObject using a PassthroughSubject as Publisher.

class PeerDatasource: NSObject, BindableObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {
    typealias PublisherType = PassthroughSubject
    
    var didChange = PassthroughSubject<Void, Never>()
    
    private var session: MCSession?
    var peers: [MCPeerID] {
        if let session = self.session {
            return session.connectedPeers
        }
        return [MCPeerID]()
    }
    var browser: MCNearbyServiceBrowser?
    var advertiser: MCNearbyServiceAdvertiser?
//rest of class...

}

Upon a peer changing state I call didChange like so...

func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) {
        DispatchQueue.main.async(execute: {
            self.didChange.send(())
        })
    }

In my Swift UI I have the following code that creates a List of PeopleCell objects in a NavigationView...

struct PeopleList : View {
    @ObjectBinding var peerDatasource = PeerDatasource(peerName: "Rob")
    
    var body: some View {
        NavigationView {
            List {
                ForEach(peerDatasource.peers.identified(by: \.displayName) { peer in
                    PersonCell(peer: peer)
                }
            }
        }.navigationBarTitle(Text("Nearby"))
    }
}

The problem I have is in this last section where I get two errors I can't work out how to resolve:

1. Missing argument for parameter 'content' in call, Insert ', content: <#(Data.Element.IdentifiedValue) -> Content#>' on line 09 and..

2. Expected ')' in expression list on line 10.

Can anyone help explain what I'm doing wrong.