I noticed high data usage when i powered on my system in my RV for the first time this season.
My provider showed a almost 500mb usage ped day!
I use a Teltonika RUT240 as my 4g router/modem and installed "Darkstat" to see my data usage.
I can se that my raspberry pi with venus os 3.30 was sending about 20 mb data per hour to an amazon cloud address (ec2-3-76-13-103.eu-central-1.compute.amazonaws.com) using the internal port 58374 on the pi.
When i made a traffic rule in the firewall blocking all traffic on that port the data usage went down to the usual 5mb per day.
I cant seem to notice that anything is not working by blocking that port, but im curious about what is using that port and using all my mobile data.
If anyone have any idea about this or know another way of testing what is causing this i would be glad.