My ISP says I have too many devices on my wifi network at home and it could be causing performance issues. Bunk! What tools are available for a Raspi Zero WH running buster, headless that can report the number and size of packets the pi sends and receives during a given interval -- lets say 20 minutes. I want each pi to monitor its own network volume.
I saw references to tcpdump, but that seems to be more for analyzing packets. I just want them counted and weighed.
Four of my devices have DHT22 sensors that report the results to an Adafruit server once per minute. Another runs a query once per day to download 1MB+/-. Another runs an app on demand that downloads <<1MB each time it's run. Then there's the handful of traffic from my ssh sessions to edit python code, git commits, etc.