Checked against the pinned Circle tree after the question of supporting
Bluetooth and WiFi on the Pi alongside USB.
Bluetooth is not possible on Circle, for two independent reasons: the stack
was removed for legal reasons and was classic Bluetooth in any case, with no
BLE or GATT anywhere in the tree, while MIDI over BLE is GATT; and the
remaining HCI transport would need a USB dongle in host mode, which the
gadget-only constraint already rules out.
That costs nothing. The WU-BT10 does GATT MIDI to the PC, and the PC is the
hub, so Bluetooth MIDI works today with no firmware change - it just
terminates one hop earlier. Section 3 now describes it that way rather than
as a spare part.
WiFi is possible via addon/wlan but is a project rather than a flag: Circle
lists WLAN as unknown on the Zero 2 W, ships no RTP-MIDI (only mDNS
advertisement of _apple-midi._udp), needs firmware blobs off the card at
boot, and its coexistence with gadget mode is unproven. Deferred, not
rejected; that last point is what to settle first.
Also marks Phase 1 done-but-unverified, and records that Phase 0 should bench
rpi_ws281x in SPI mode on GPIO10, since the stock examples use GPIO18 over
PWM and would prove the wrong wiring.
Claude-Session: https://claude.ai/code/session_01TVCB25LBsmeteWvaSMz4Ne
prosolis