Android Bluetooth

Android Bluetooth

Use bluetooth for Bluetooth state and BLE client tasks.

Actions

• status: inspect adapter state and the single active BLE connection.
• set_power: request and verify the Bluetooth power state.
• open_settings: open Android Bluetooth settings.
• paired_list: list bonded Bluetooth devices.
• ble_scan: discover nearby BLE devices.
• ble_connect: connect one device and discover its GATT services.
• ble_inspect: list service UUIDs, characteristic UUIDs, and supported properties.
• ble_read: read one characteristic.
• ble_write: write one characteristic after user confirmation.
• ble_disconnect: close the active GATT connection.

BLE Workflow

1. Check status; enable Bluetooth if needed.
2. Use ble_scan, or select a known device from paired_list.
3. Use ble_connect with the returned address.
4. Use ble_inspect before reading or writing.
5. Use only service and characteristic UUIDs returned by ble_inspect.
6. Disconnect when the task is complete.

Only one BLE GATT connection can be active. Disconnect it before connecting another device.

Value Rules

• ble_read always returns value_hex. It also returns value_utf8 only when the complete byte sequence is valid UTF-8.
• ble_write requires encoding=hex|utf8. Hex must contain complete byte pairs.
• Prefer write_type=auto. Select another write type only when the device documentation requires it.
• A write without response reports device_acknowledged=false; this means Android started the write but the device did not acknowledge it through GATT.

Never invent BLE command bytes, register values, or device protocol meanings. Write only when the user supplies the value or a trusted device protocol/profile skill defines it. Generic characteristic names or UUIDs are not enough evidence for a device command.

Safety and Result Truth

• Every ble_write requires user confirmation before bytes are sent.
• A settings or pairing flow is not a successful connection. Success requires a verified active GATT connection.
• connection_not_verified means setup may have completed, but the device is not connected.
• Permission, cancellation, timeout, unsupported property, and GATT status failures are explicit results. Do not describe them as success.

Scope

The generic tool does not provide Classic Bluetooth sockets, multiple simultaneous connections, background reconnect, notification subscriptions, descriptor operations, bonding control, or device-specific value decoding. Use Android settings for pairing and device management.