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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.

Apparently the A2035H is no longer in production. Maestro has the A2235H, a newer GPS module that does fit on our PCB (although the module is smaller than its predecessor), but it needs two additional 2k2 pull-up resistors from the I2C pins to the 1.8V output of the module. You may also need some (kapton) isolation between the PCB and the module to avoid short circuit between the shielding of the module and a via underneath it.