The app communicates via MQTT protocol and various telegrams with a Raspberry PI.
The Raspberry PI detected based on the number of sensors postboxes a laboratory
Mobile and Distributed IT TH Cologne, Campus Gummersbach, attached mailbox.
Every status change is displayed on the app. Additionally, in addition to various
Test functions, the app once a light at the mailbox and off.
The status of the lighting is also displayed in the app.
MQTT broker Topic etc. are freely programmable and can be managed through a list.
As of version 3.0, in addition to optical "Notification", an audible signal when
the number of counted postboxes changes.
As of version 4 Disconnection for MQTT broker is detected. The Radio "online" button
flashes no longer in this case. Click this radio button, or via the Advanced Settings menu
is immediately reactivated the connection.