Deno Server Doesn't Know if Bat Signal is On/Offline #3
Description
This issue is part of the Below C Level Hacktivity - 25.11.04 (Issue #5).
Issue
The Deno Server is currently unaware of Bat Signal's connected/disconnected status. This means the frontend will behave as if Bat Signal is powered on and connected to Arduino Cloud regardless of whether this is true, providing no feedback that the system isn't up.
Hint
The Deno Server currently uses the npm pkg arduino-iot-js to listen for and send Cloud Variable changes, but this library is limited. We can't use it to get Associcated Device on/offline status. Arduino provides another way to do this. (Because we won't be upgrading our Arduino account, webhooks and triggers are unavailable. Think "polling.")
Possible Fix
Employ Arduino IoT Cloud API (REST) either manually or using the helper npm pkg @arduino/arduino-iot-client. Use Devices V2 Show and not Devices V2 GetStatusEvents. The latter requires start and limit params, which makes it impossible to reliably get the very last event (which tells us the current on/offline status). If there are no recent events, an empty array is returned (the cache duration unknown), so we won't know if the last event was a CONNECTED or DISCONNECTED. Also, we'll want to disable the frontend when Bat Signal is offline.