void setSelectedGroup(final int address) {
        final Group group = mMeshNetwork.getGroup(address);
        if (group != null) {
            mSelectedGroupLiveData.postValue(group);
        }
    }
Sets the group that was selected from the GroupAdapter.
app/src/main/java/no/nordicsemi/android/nrfmesh/viewmodels/NrfMeshRepository.java