Fragment {

    @Inject
    lateinit var viewModelFactory: ViewModelProvider.Factory
    private lateinit var viewModel: CastViewModel

    // onCreateView

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        viewModel = getActivityViewModel(viewModelFactory)

        // Other setups
        //...

        <some_button>?.setOnClickListener {
            viewModel.sendPackage( listOf( CastMessage("category", "Hello World!") ) )
        }
    }

    // Other functions

    // Companion Object
}