Hi,
This sounds like an interesting project, and I have relevant experience which would be useful to you.
I've developed a number of apps for custom Bluetooth LE devices, where I have been given the Bluetooth Protocol document (outlining the low-level communication), from which I have developed the relevant Objective-C or Swift classes, to provide an SDK.
I develop apps for iPhone/iPod Touch/iPad running iOS 9, using Xcode, Objective-C and Swift.
You can see some examples of my work, and client reviews of my completed projects, on my Freelancer profile page.
My bid is for an iOS SDK, written in either Objective-C or Swift. (To have both languages would cost an extra $100.)
If you'd like to reply to this message, we can discuss things further, before you make your decision on awarding the project.
Best Regards,
- Rob Dixon.