Yes, I did get his to work, I have it somewhere in my module 205 code somewhere....

My main problem was that the extract functions didn't work as advertised, so was packing stuff, unpacking to check and getting bogus results. Extract is now fixed (but pack actually did work OK).

I think I went over this with someone else here on the forums, they were having trouble extracting the float from a sigfox packet. It's actually quite simple, it was the extract giving bogus values that had me confused...