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We're making the DrumPants BCM2073x firmware open source! It includes a speed-optimized implementation of Apple's MIDI over Bluetooth LE spec for making wireless musical instruments. You can use it to control music apps like Garageband or Abelton wirelessly on iOS and Mac, connecting using the native OS support.
The firmware includes several connection improvements for the hello_sensor example, including:
Workarounds for Android pairing problems
A way to reliably request the fastest connection interval from different devices (since different versions of iOS and Android require different optimal connection parameters).
This could prove useful to other projects besides musical instruments.
Please let me know what you think, and if you'd like to know more, please visit our IndieGoGo campaign and support open source!