Android Question Android Auto notifications

Hi - following lots of info in these forums, I have a b4a app which is visible in Android Auto. I don't need it to do anything complicated, I just need to be able to send notifications which will appear on screen. This doesn't seem possible with the available libraries. It seems that for a notification to be shown in Android Auto it has to be of a particular style (MessagingStyle), and this is not something that can be set in a normal notification or with the builder in the NB6 library. NB6 does have a property 'MediaStyle' which I tried setting thinking Android Auto might display that type, but this didn't work.

Has anyone managed to send a message to appear in the Android Auto head screen?

Thanks for any help