[Almaretto]

I am currently testing a "Pro" feature in my app, which allows you to do FDL coding just like you would with E-Sys. The app restricts values to not exceed the bit mask like E-Sys does at the moment, but I just could deactivate that feature for testing. Could someone send me the NBT ncd so I can have a look at the coding data? I would test myself, but I only have a 1st gen NBT.

You can generate any NCD your want with E-sys Coding-Verification. What do you mean by 1st gen NBT? Do you mean you are looking for HU_NBT2 (AKA HU_NBT_EVO)?

I have a HU_NBT in my car. I had a look into the CAFD and the missing two bits are not occupied by any other function, so one could just edit the raw ncd, update the checksums and the signature (if necessary) like described here or if anyone has an iOS device available try it with an enhanced version of my app.

Then HU_NBT is no different whether from 2013 or 2016 (ie both (CAFD_00000DED). See this PDF.

Unless your app calculates for user, then checksum & signature would have to be updated.

How is vehicle communicating with IOS device?