Corrected application name.
Removed the StatusLayer and replaced it by a simple label at the bottom of the window to indicate the connection status.
Removed dummy button.
Added key to trigger an update of the connection button.
Added entries to store information about the MQTT broker and the connection sate.
Removed the StatusLayer (to change the user's status (online, offline, do not disturb)) and integrated a simple toggle button at the bottom to say if the client should be online or offline.
Started to implement the connection model to use MQTT to connect to the server.