Pair-wise UWB distance where 1x of DWM3001CDK recieved the data from other 5x DWM3001CDK

What is the correct way to recieve correct measurment from the pairwise sets

Do you mean using some api. Uci does this by combining the individual remote/controlee results in an array of results (on one to many)

I am writing custom firmware on the onboard nRF52833 using the SDK
When configuring a One-to-Many FiRa session in C, what callback or structure exposes the array of ranging results for all 5 controlee MAC addresses once each ranging round finishes?

There is only one ranging response, there is a count of records, each from a different controlee
I don’t know any lower level mechanism and the lib is only provided in binary

See the doc provided on uci twr