iOS 14.4.2 / iPhone X – UDP connection failed to send data: No route to host. sendingMessageFailed(code: 65)

Hi,

I am trying to use the example code, but am getting the following error when I try to invoke sendBroadcast:

"UDP connection failed to send data: No route to host"
sendingMessageFailed(code: 65)
"Closing UDP socket"

In my app I have:

import SwiftUI

// ...

struct ContentView: View {
    // ...
    var conn: UDPBroadcastConnection
    // ...
    init () {
        // ...
        conn = try! UDPBroadcastConnection(
            port: 9012,
            handler: { (ipAddress, port, response) -> Void in
              print("Received from \(ipAddress):\(port):\n\n\(response)")
              },
            errorHandler: { (error) in
              print(error)
            })
    }

    var body: some View {
        // ...
        Button(action: {
            // ...
            do {
                try conn.sendBroadcast("This is a test!")
            } catch {
                print(error)
            }
        }, label: {
            Text("Send")
                .padding([.top, .bottom], 6)
                .padding([.leading, .trailing], 18)
                .background(Color.green)
                .foregroundColor(.white)
        })
        // ...
    }
}

This happens regardless of which port I try to use, and it happens even though I have set a string value for NSLocalNetworkUsageDescription in Info.plist and I say "OK" when I am prompted that my app "would like to find and connect to devices on your local network." along with the message that I set in Info.plist.

I am running the app on an iPhone X with iOS 14.4.2. I am connected to a WiFi network.

gunterhager / UDPBroadcastConnection

iOS 14.4.2 / iPhone X – UDP connection failed to send data: No route to host. sendingMessageFailed(code: 65) #25