Uses hidapi to listen for UPS data.
Currently only tested working with a CyberPower CP1500PFCLCD
This must be run as root unless the user has privileges to use the hidraw socket the UPS uses.
This package can be installed with sudo pip install --break . then run with sudo hid_ups.
Once started, hid_ups will attempt to find UPS devices and listen for stats.
A SIGHUP can be sent to the process to re-scan for devices.
This will close current listeners, and will momentarily throw errors until the socket is re-opened
hid_ups detects the device using vendor/device strings. Only one is currently added. The are defined in hid_devices