feat: add optional BLE MIDI support for ESP32 - #187
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godden-sys wants to merge 2 commits into
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godden-sys wants to merge 2 commits into
godden-sys wants to merge 2 commits into
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Description
This adds an optional Bluetooth Low Energy MIDI transport for ESP32 targets, using the BLE library already included in the arduino-esp32 core. USB/serial MIDI and Teensy paths remain unchanged. The feature is opt-in via a build flag so it does not affect existing behavior.
What changed
Added USE_BLE_MIDI build-flag gating in platformio.ini for ESP32 environments.
Extended edrumulus.ino with:
BLE MIDI server, characteristic, and advertising setup
BLE-MIDI packet framing for note on/off, control change, and aftertouch
Inbound MIDI handling over BLE for the existing control surface
Dual-path MIDI output so USB/serial MIDI and BLE MIDI can coexist
Files
platformio.ini
edrumulus.ino
How to use
Build with USE_BLE_MIDI=1 enabled for an ESP32 environment.
Pair/connect from a BLE MIDI host; the device advertises as Edrumulus.
MIDI events are sent over BLE when a client is connected; existing USB/serial MIDI continues to work.
Compatibility
Teensy and non-BLE ESP builds are unaffected.
No new external libraries are required beyond the ESP32 BLE library bundled with arduino-esp32.
USB MIDI/TinyUSB behavior is preserved.
Notes
Initial testing shows functional BLE MIDI output; latency tuning may still need feedback from users.
Current implementation sends multiple messages per hit; further optimization is possible if needed.