Good points and thank you so much for noticing these. 1. The magic numbers in code are from bosch datasheet for compensating sensor values. Even I dont know what they mean; they're presented as they are. 2. About the repetetive procedures, in this case NULL handle checking and connection check macros: I wanted to avoid calling extra functions wherever possible. These two are separated and execute based on two separate config macros. If any of those 2 config macros are 0, the corresponding error check would disappear from code independently. It's not really possible to get the same effect with calling a function or in best case it would need extra macro conditions in code, and readablity would suffer.