Opened four draft PRs from the BLE MIDI work: #1482 is the main one (LE peripheral pairing, connection parameters and btmidi.class). #1483 (CAMD on 64-bit) and #1484 (Pi 3 console and Bluetooth patchram) are needed for it to work on a Pi 3; #1485 is a separate llvmpipe link fix. Tested on a Pi 3 with an iPhone, MIDI both ways. Happy to split or rework anything before marking them ready.