The revision B PCB is currently in manufacture. Once it's built and tested without any issues I'll upload gerbers, BOM and firmware HEX file.  The image shows the prototype board in service supporting an RPi3B+ and RAK2247 LoRa gateway working very reliably.

Upload Eagle files

https://www.crowdsupply.com/envox/eez-bb3

Nice article .. Good job !! very helpful  Nikhil   

PIC microcontroller code (in XC8) is now complete and fully functional for the prototype hardware. Shut-down timing is computed in real-time based on the state of charge of the supercaps and their rate of voltage drop. The mechanism provides 15 second warning of critical capacitor voltage loss independent of o/p power consumption and size of the super-caps.  A bash shell script running on the Pi (as root) initiates a clean shutdown upon request from PoEUPSPi via a GPIO pin.