Hi there, what kind of LE device do you have? I've worked on an LE printer project before:
http://www.freelancer.com/projects/Mobile-Phone-iPhone/iPhone-app-that-prints-over.html
I think you are using lightBlue app to test your device, but you don't have source code to integrate into your app. That's the same story for my previous client. I have the code ready, but would like to find out the characteristics list you want.
Looking forward to hearing from you!
Best,
Frank