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There is official API for Windows, WindowsPhone8 and WinRT https://legoev3.codeplex.com/ it lets you connect to EV3 brick and control it remotely from your WindowsPhone.

Are there any libraries available for Android (Java) or iOS (Objective-C)?

I would like to write custom app for myself that will let me steer my own robots (using either Android or iOS device).

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Hmm, I imagine there will be eventually - I'm guessing MS offered to release the Windows one as LEGO hadn't released the "Commander" app on their platform. LEGO did release a BlueTooth Developer Kit and Mobile Application Software for the NXT so it's probably coming. –  Zhaph - Ben Duguid Apr 2 at 16:10
    
Taking a look at the code in the Windows API, there are no external dependencies - so assuming you have access to the Bluetooth ports on iOS/Andriod, there should be nothing stopping you porting this to your platform of choice with a little effort - the main "API" is in the Lego.Ev3.Core namespace, which is pulled into the Phone/Desktop/WinRT projects that provide the communication wrappers that are then used by the sample projects - the Desktop project has the added excitement of Brian's WIImote support ;) –  Zhaph - Ben Duguid Apr 2 at 16:19
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@Zhaph-BenDuguid how about Xamarin would it work on iOS –  michael Apr 3 at 12:18

1 Answer 1

There's an official app released by LEGO called the LEGO MINDSTORMS COMMANDER. It's available on both Android and iOS.

I believe this is what you are looking for. LMC lets you control the EV3 brick via bluetooth on your smartphone. It's not exactly an API, but it lets you control the EV3.

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