I've thought it would be fun to try and sell a device with dual ethernet ports that people can plug in between their router and modem, which would constantly mo

I've thought it would be fun to try and sell a device with dual ethernet ports that people can plug in between their router and modem, which would constantly monitor their internet performance and give them a real time dashboard, in addition to reports. The goal being identifying how consistent your speed from your ISP is in general and detecting cases of throttling etc.