P2P voice

[ajamous]

The idea is to add voice capability (walkie talkie style) using Cross-platform BLE data channel voice
• Keep everything in BLE and add LE L2CAP CoC (connection-oriented channels):
• Android: BluetoothDevice.createL2capChannel(psm) / BluetoothAdapter.listenUsingL2capChannel() (LE-only).  
• iOS: CBPeripheral.openL2CAPChannel(PSM) / CBL2CAPChannel for a raw byte stream. 
• Advertise the dynamic PSM via an existing BitChat control packet (or a small GATT characteristic), then open the CoC for audio frames (e.g., Opus 12–20 kbps).
• This keeps BitChat mesh + discovery on BLE, and gives you a reasonably low-latency byte pipe for half-duplex “push-to-talk” or even full-duplex if you’re careful with buffering.