How to respond if queried device does not have an active session?

[gmuratk]

Problem description

There may be cases where the queried device for connectivity or roaming does not have an active session. An appropriate API response needs to be agreed to ensure same behavior by multiple API providers.
Possible evolution

• An error response may be returned with an appropriate message.

• A success message with a dedicated property maybe used to indicate device is not online

Alternative solution

Additional context

see: camaraproject/Commonalities#127 (comment)

[akoshunyadi]

For connectivity we have the response value NOT_CONNECTED.
For roaming status the last known status is returned. So if the device changes to roaming and then it will be switched off, then the expected result is roaming=true.

[gmuratk]

Thanks @akoshunyadi. I think it will be good to document the expected behavior for the roaming case. We probably want to avoid API consumers mistakenly rely on retrieve-roaming-status response to infer device's connectivity status.