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fixes #14598
Currently, the UI assumes that it's offline when it does not receive a ws message for 5 minutes. This is necessary because of unreliable connect/disconnect browser events, especially in an embedded contexts (e.g. iOS app resume). Once the browser reached this 5 min timeout it enters offline mode didn't check online status ever again. This is fixed in this issue. Entering offline-state due to no data will now trigger a ws reconnect. Additionally, I've introduced a heartbeat message to prevent entering this no-data timeout in situations where not much changes (nights, clouds, ...).
added heartbeat message to prevent false offline detection(later if needed)