@markatrafik , do you know what purpose is ubuntu push client ?
Is it a server related to push for SMS for instance ?
Perhaps, as in Android, apps maintainers can use this feature to report through the Cloud about changes in settings (for example: a new list of maps or remote servers), rather than when everyone is connecting to their Cloud and wasting battery of the phone.
Another question, do you know what is the 10.15.19.82 address ? > I have tried to reach it in a browser to find the owner without success.
Perhaps it is some kind of IP network for internal use, as I understand it, the external network may not be available, for example not given to DHCP for some reason, but communication within the phone is needed, within the same OS communication can be organized through localhost or named sockets, and here between different OSs.
I hope that people knowledgeable in the subject will correct me, I am purely out of general knowledge...