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#multiplatform
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# multiplatform
s
Simon Buechner
10/09/2023, 7:00 AMHi everyone, does someone has experience with KMP native Coroutines? I have a Stateflow with a list of CBPeripherals wrapped in a data class, so BluetoothDevice { peripheral: CBPeripheral, rssi: Int} but if I use the native coroutine I can only access rssi but not the peripheral on the swift side in the publisher. Maybe this question doesn’t really belong here but I am really stuck for now and I hope someone has experience with this in here 😬
r
Rick Clephas
10/09/2023, 7:02 AMCould you possibly share the relevant code?
s
Simon Buechner
10/09/2023, 7:06 AM Copy code
KMM Side
@NativeCoroutines
val discoveredDevicesFlow = session.discoveredDevicesFlow
iOS Side
// Create an AnyPublisher for your flow
let publisher = createPublisher(for: facade.discoveredDevicesFlow)
// Now use this publisher as you would any other
publisher.receive(on: mainQueue).sink { completion in
print("Received completion: \(completion)")
} receiveValue: { value in
self.discoveredDevices = value
}.store(in: &cancellables)r
Rick Clephas
10/09/2023, 7:14 AMAnything special about the
BluetoothDevices
Simon Buechner
10/09/2023, 7:16 AMnot that i know @Rick Clephas
Copy code
data class BluetoothDevice(
val peripheral: BluetoothDevice,
var rssi: Int,
)r
Rick Clephas
10/09/2023, 7:38 AMIn that case it might me a limitation of the ObjC interop. Do you see the
peripheralAnys
Simon Buechner
10/09/2023, 7:40 AMi dont see it, if i try to access the property of the value on the swift side. i see it if i look into the fat framework, there has the attribute of bluetoothdevice the type of CBPeripheral.
r
Rick Clephas
10/09/2023, 7:42 AMHmm oke and the type of
values
Simon Buechner
10/09/2023, 7:42 AMthats right.
i can use it, i can list the found devices if i display a list of device.rssi but i cannot use the full device for anything without getting an error:
Conflicting arguments to generic parameter 'Content' ('ForEach<[BluetoothDevice], String, <<hole>>>' vs. 'ForEach<[BluetoothDevice], String, <<hole>>>' vs. 'ForEach<[BluetoothDevice], String, <<hole>>>' vs. 'ForEach<[BluetoothDevice], String, <<hole>>>')
In my view.
r
Rick Clephas
10/09/2023, 7:47 AMAccording to the error messages the
<<hole>>>ForEachs
Simon Buechner
10/09/2023, 7:50 AMah sorry posted an old data class:
Copy code
data class CustomDevice(
val peripheral: BluetoothDevice,
val identifier: String,
var rssi: Int,
) Copy code
List(viewModel.discoveredDevices, id: \.identifier){ device in
Button("device.rssi", action: viewModel.connect(device:device)
}if i use it like this, i can at least call the function and everything works, but accessing the peripheral is on the swift side again not possible:
Copy code
Text("\(digipen.rssi)")
.onTapGesture { viewModel.connect(device: device) }r
Rick Clephas
10/09/2023, 8:01 AMThat’s interesting, I haven’t experienced something like that yet.
i see it if i look into the fat frameworkIf that’s the case, it sounds more like a Swift issue than a Kotlin one.
s
Simon Buechner
10/09/2023, 8:09 AMMhm thats sad for finding my problem 😄 but thanks for your help @Rick Clephas
Im not sure where it could be an swift issue, it just has no member peripheral directly in the publisher receive call. 😕
oh but at the moment i see the value has no members and it seems to be of type any therefore.
so it seems like it could be a cinterop problem actually @Rick Clephas
i just converted the value to [CustomObject] therefore i could access rssi because its a simple int value but peripheral could not be converted?? semms this reasonable ?
r
Rick Clephas
10/09/2023, 8:13 AMIf you cast the value to your data class you should be able to access all the properties not just
rssis
Simon Buechner
10/09/2023, 8:51 AMmhm it was just a mad moment of mine ... i tried to access value but i forgot it is a list and not the object. i can just access the first list item and can see it has rssi and identifier so the simple values but it doesnt show the peripheral attribute.
@Rick Clephas ... i found my problem, thanks for your help. 😄 mondays is always hard ... the problem was the missing corebluetooth import ....
r
Rick Clephas
10/09/2023, 11:10 AMNice! Glad you find the issue 👍🏻
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