When hub loses the connection with the server, Ajax apps can notify the users using a standard push-notification sound or a siren sound (enabled by default).
To disable the siren sound when hub loses the connection with the server in the Ajax app:
- Go to Service settings of the hub (Device
→ Hub → Settings → Service). - Select menu item Server Connection.
- Enable the option Receive events of server connection loss without alarm.
→ Hub → Settings 
→ Service).
