First of all - just realizes @fitbit uses ANT - lets see if I can try my digitfit sync as well with it. For some reason though it seems to only sync after an initial reboot. here are some logs:

Dec 19 14:07:53 eugene-borukhovichs-macbook-2 com.fitbit.fitbitd[46]: Sun Dec 19 14:07:53 eugene-borukhovichs-macbook-2.local MacUserInterface[46] <Info>: Setting network key [network: 0]…

Dec 19 14:07:53 eugene-borukhovichs-macbook-2 com.fitbit.fitbitd[46]: ANT: WriteBytes: wrote 15 bytes of 15

Dec 19 14:07:54 eugene-borukhovichs-macbook-2 MacUserInterface[46]: SetNetworkKey failed

Dec 19 14:07:54 eugene-borukhovichs-macbook-2 com.fitbit.fitbitd[46]: ANT<BOOL DSIFramerANT::SendCommand(ANT_MESSAGE*, USHORT, ULONG)>: Framer->SendCommand(0X46): Timeout.

Dec 19 14:07:54 eugene-borukhovichs-macbook-2 com.fitbit.fitbitd[46]: Sun Dec 19 14:07:54 eugene-borukhovichs-macbook-2.local MacUserInterface[46] <Critical>: SetNetworkKey failed