Running my own NAS (Synology) I decided to install the Chat App from Synology. So I downloaded the apk from the Synology Download Center. After I installed the apk and connected the App with my server I was able to send and receive messages.
The only thing that did not work is the notification sound and the bulb that a new message arrived. Is there anybody out there with the same problem ?...or may be anybody with a solution?
(Of course I have given all avaiulable permissions to this App)