Suspected i2c or uart or firmware error
1. sometime the pump return true/false while they may/may not run
2. comm_test does not work (return false?)
3. LED and version query function does not work (return false)
we tried flashing the firmware of the pump but it didn't help.
(flashing of fuses failed though)
we also notice that there could be multiple version of the router pcb,
there are 3 pad labeled ver on it and is connected to R0,R1 and R2 then to ATmega.
Is this a good question?