- Connect MCU reset to the programming header, it's not possible to flash the MCU when it's in sleep mode
- RFU consumes around 500 uA when pins are floating in sleep mode - tie Reset and all SPI pins to vcc with a resistor - interestingly, the power consumption rises from 100 uA to 500 uA slowly when no resistors are used
- Issue between schematic and PCB - L96 reset pin is connected to BATT+ on PCB, but not in schematic, should be floating or tied to vcc
- connect all unused MCU pins to ground to reduce power consumption due to noise
- put 0R resistors in power line of each device for measuring the power consumption of each piece
- Remove GPS fencing pin and connect EXTINT0 pin for entering GPS standby immediately after powering up the MCU.
- add pull down to FORCE_ON GPS pin
- Test if L96 works, was not able to get first fix below 20min on the prototype
- Consider sending AGPS data over lora to device to speed up the GPS fix