If I want to connect my peripheral (Arduino) to my central (Iphone) do I have to structure the data in the arduino as a services and characteristics? I have seen some projects where an iphone is connected to an arduino but iphones scan for UUID's and services so I am not sure how they implemented the code on the arduino side?
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As a BLE peripheral, your Arduino will advertise one or more services (with characteristics) that you specify.
You mention in a comment that you are using a RedBearLabs BLE shield. You can use the RedBearLab library (download from http://redbearlab.com/bleshield/) to set up your service in your Arduino sketch. For an example, see Getting Going With iOS and Arduino Using Bluetooth LE.
Chris Miles
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Every hardware provide have there own specification . Some provider will give you in built service and characteristic (readable and writable) . If it is BLE dongle then there may be some services implemented to in . Better you can use core ble application like LightBlue and try to explore services and characteristic in that dongle . Other wise you can contact their customer service , they will let you know about that dongle .
V-Xtreme
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