Thanks for the link. They assume that Android devices can scan in the background but my experience is that whilst this is theoretically achievable, the experience is unreliable in practice. See this guide which shows how to make things more reliable https://openpathsupport.zendesk.com/hc/en-us/articles/360024...
And they state that for iOS in background mode:
> A nearby Android device acts as a bridge. It receives TCNs through “central” write operations and adds them to a rotating list to broadcast alongside its own TCN.
And they state that for iOS in background mode:
> A nearby Android device acts as a bridge. It receives TCNs through “central” write operations and adds them to a rotating list to broadcast alongside its own TCN.
Which doesn't sound that reliable or accurate.