Android MVVM ViewModel update LiveData inside a timer Null first time bug (fix my code)

This simple ViewModel code is working, but the first time the code read/write it returns a null and following read/write the data always one cycle behind. It looks like the it only completes the write once it switches from the timer back to the main activity. You can see the from the Log output the initial write/read is Null, this should be the first set of data. Ideally I want to update ViewModel variables from different activities and update the UI based on the observe. I thought updating the ViewModel variables from any source, would cause an update and could be read from any where. I understand .setValue and .postValue is Async but I have tried different time delay, writing and reading at different points and still the same problem. I thought the problem could be the ViewModel not initiated at the start, but tried to create it before use and still the same problem. May be I miss understood how ViewModel structure works, but I want to integrate this code into a larger BLE mobile app so I need the ability to store the data and update the UI when the BLE data changes. May be it would help if any one has experience in MVVM to support my understand how it should all work. Many thanks for your help and support