I just came across this wonderfully detailed guide to iOS CoreBluetooth written by Gretchen Walker of PunchThrough. It goes into the details any iOS developer should try to keep in mind when integrating with Bluetooth devices. It is very much worth bookmarking and referring back to.
I also heartily recommend their wonderful iOS app for debugging your Bluetooth peripherals and the environment they’re operating in. I use it frequently.
Allen at Automattic 