How to connect to a Wifi network without dropping mobile data connection

I’m building an Ionic app that uses a plug that connects to the diagnostic port in a car. The plug receives a command over WiFi that it transmits to the cars onboard computer and returns information about the sensor readings in the car.

Currently if I connect my phone to the plug’s WiFi it disables my mobile data connection. I guess the Android OS assumes that every WiFi network is connected to the internet.

Is there a way to prevent mobile data from being disconnected when connected to a WiFi network?

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From my knowledge, there’s no such thing. It would be a HUGEEEEE security hole, especially on Android platform which is already full of holes.