The previous way of handling notifications and urgencies led to race conditions and wrong messages being sent when urgencies were switched. This issue is resolved with this change, which also enables easier triggering of the proper messages from rules.
With this change urgencies are now plain text and do not have to be numeric.
HomeKits BridgingStatus service and Reachable characteristic enable reporting of the backend connectivity status. The accessory now reports the status of the telegram connection, which is sadly not used by the Home app (as of iOS 11.2.) The reachable characteristic is evaluated by the Elgato Eve app.
The introduction of the Reachability characteristic has removed the need for the previously available Failed characteristic.
With the new way of sending messages from predefined groups, the previous use of urgencies has been removed.