DeviceInterface | For a very simple usage example , see our console-demo

Sorry for the somewhat vague question title, but I'm not exactly sure what a more appropriate title would be.

Let me start by explaining my setup and what I'm trying to achieve.

I have defined an interface called DeviceInterface. I have two objects that conform to that interface: a mocked object called MockedDevice and the actual implementation object called DeviceImplementation.

The plan is to use MockedDevice for SwiftUI previews and for running the app in the simulator (where certain device actions/values are not available) and DeviceImplementation for on device execution.

The issues arises in DeviceApp where I instantiate the main app view with an object that conforms to DeviceInterface. I define a generic property of type DeviceInterface that I try to set based on whether the code is executing on the simulator or on the device.

When I try to pass that property to the main view of the app (ContentView that initializes with a generic type that conform to the interface DeviceInterface) I get the following error:

Value of protocol type 'DeviceInterface' cannot conform to 'DeviceInterface'; only struct/enum/class types can conform to protocols

Initializing the property directly as let device = DeviceImplementation(device: UIDevice.current) or let device = MockedDevice(device: UIDevice.current) (by omitting the type) and then passing this value works totally fine, so it seems that my problem is in the type definition of the property.

I know I could just rearrange the code a bit and instantiate ContentView inside the #if TARGET_IPHONE_SIMULATOR cases using the above working instantiation methods where I omit the type definition, but I want to understand what I'm doing wrong and how can I make the below code work.

See the following example for a demonstration of what I'm trying to achieve. Please keep in mind it's a quick and simple demonstration of the problem I'm tying to solve.

I tried to use the using-declaration of C++11 to write the constructor like the following

TypeError: Cannot read property 'ip' of null

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and at the next this :

"Wrong 1st argument type. Found: 'com.harrysoft.androidbluetoothserial.demoapp.CommunicateViewModel', required: 'android.content.Context' less... Inspection info: startForegroundService (android.content.Context, Intent) in ContextCompat cannot be applied to (com.harrysoft.androidbluetoothserial.demoapp.CommunicateViewModel, Intent)  "

How can I solve this problem?

CommunicateViewModel:

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I have event that listen to usb that inserted, but I need the inserted letter, because I have mulpile usb ports.

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I try to initialize COM port from UWP application using following code:

I am trying to update local Storage with a function called addDevice(), it checks if there is already some data in a key then it appends to that else just update the key.

I have a class called MyDevicesPage which controls a page i am trying to manipulate the res object and then pass it to updateDevicesToServer method of DataService for further actions. the code compiles fine but in run time it throws an error ERROR Error: Uncaught (in promise): TypeError: Cannot set property 'devices' of undefined

here are the class and associated interfaces