Describe the bug
With kuksa-java-sdk 0.4.0 we removed the subscription logic from inside the SDK. Instead of doing the subscribe / unsubscribe internally we wanted to expose the CancellableContext. However, the KuksaValV1Protocol class does still return void for some subscribe methodds. This should be aligned.
To Reproduce
n/a missing functionality
Expected behavior
KuksaValV1Protocol#subscribe returns CancellableContext
Screenshots
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Smartphone (please complete the following information):
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Additional context
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