It is still a work in progress but it does work. Bluez is the official Bluetooth stack for Linux and the 5.x series has introduced Bluetooth LE support. Once you have the correct kernel in place you need to grab the latest version of Bluez. I also used a 3.5 kernel on a laptop that worked fine but you can't go any older than that. Currently it is 3.6.11 and that worked well for me. For the RPi it is easy enough to get a very recently kernel using rpi-update. The GBU521 seems to be recognized by older kernels but to get LE support go with the latest kernel you can find. The only issue I had is the size itself, if it didn't have a little nub on the end it would be too small to pull back out of the USB plug. To start with I picked the IOGEAR Bluetooth 4.0 USB Micro Adapter (GBU521) that can be found on Amazon for just $13 since it looked like the chip it uses is decently supported with recent Linux kernels. What follows is the information you need to get things going. It turned out not to be as hard to get working as I thought it might be thanks to recently added support in the Bluez 5.x Bluetooth stack. Over the holiday I had a little time to fiddle with the Raspberry Pi I got earlier in the summer and I started wondering how hard it would be to get a Bluetooth LE adapter working.
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