Investigate shelly announcements on plugin startup

[AaronLionsheep]

When the plugin first starts, should it request all devices announce themselves to ensure device discovery can be kept up-to-date?

[AaronLionsheep]

This does not seem possible at the moment. Devices will continue to start after startup completes. If a device starts after the announcement message has already been received, then erroneous message will be logged indicating that was a new device at the time.

There doesn't seem to be a way to internally call a plugin action with a delay.