Here is a list of all files with brief descriptions:

Connection3G.cpp
Connection3G.h
Constants.h
FXLS8471Q.cpp
FXLS8471Q.h
Gateway.cpp
Gateway.h
Leds.cpp
Leds.h
lora_class.cpp
lora_class.h
PCT2075.cpp
PCT2075.h
Sensors.cpp
Sensors.h
SensorStab.cpp
SensorStab.h
SensorStab_GSM.cpp
SensorStab_GSM.h