The list of available settings is determined by various files in ZMK whose names start with `Kconfig`.
The list of available settings is determined by various files in ZMK whose names start with `Kconfig`. Note that options are _not_ prefixed with `CONFIG_` in these files.
See [Zephyr's Kconfig documentation](https://docs.zephyrproject.org/latest/guides/kconfig/index.html) for more details on Kconfig files.
See [Zephyr's Kconfig documentation](https://docs.zephyrproject.org/latest/guides/kconfig/index.html) for more details on Kconfig files.
| `CONFIG_BT` | bool | Enable Bluetooth support | |
| `CONFIG_BT` | bool | Enable Bluetooth support | |
| `CONFIG_BT_MAX_CONN` | int | Maximum number of simultaneous Bluetooth connections | 5 |
| `CONFIG_BT_MAX_CONN` | int | Maximum number of simultaneous Bluetooth connections | 5 |
| `CONFIG_BT_MAX_PAIRED` | int | Maximum number of paired Bluetooth devices | 5 |
| `CONFIG_BT_MAX_PAIRED` | int | Maximum number of paired Bluetooth devices | 5 |
| `CONFIG_ZMK_BLE` | bool | Enable ZMK as a Bluetooth keyboard | |
| `CONFIG_ZMK_BLE` | bool | Enable ZMK as a Bluetooth keyboard | |
| `CONFIG_ZMK_BLE_CLEAR_BONDS_ON_START` | bool | Clears all bond information from the keyboard on startup | n |
| `CONFIG_ZMK_BLE_CONSUMER_REPORT_QUEUE_SIZE` | int | Max number of consumer HID reports to queue for sending over BLE | 5 |
| `CONFIG_ZMK_BLE_KEYBOARD_REPORT_QUEUE_SIZE` | int | Max number of keyboard HID reports to queue for sending over BLE | 20 |
| `CONFIG_ZMK_BLE_INIT_PRIORITY` | int | BLE init priority | 50 |
| `CONFIG_ZMK_BLE_INIT_PRIORITY` | int | BLE init priority | 50 |
| `CONFIG_ZMK_BLE_THREAD_STACK_SIZE` | int | Stack size of the BLE notify thread | 512 |
| `CONFIG_ZMK_BLE_THREAD_PRIORITY` | int | Priority of the BLE notify thread | 5 |
| `CONFIG_ZMK_BLE_THREAD_PRIORITY` | int | Priority of the BLE notify thread | 5 |
| `CONFIG_ZMK_BLE_KEYBOARD_REPORT_QUEUE_SIZE` | int | Max number of keyboard HID reports to queue for sending over BLE | 20 |
| `CONFIG_ZMK_BLE_THREAD_STACK_SIZE` | int | Stack size of the BLE notify thread | 512 |
| `CONFIG_ZMK_BLE_CONSUMER__REPORT_QUEUE_SIZE` | int | Max number of consumer HID reports to queue for sending over BLE | 5 |
| `CONFIG_ZMK_BLE_CLEAR_BONDS_ON_START` | bool | Clears all bond information from the keyboard on startup | n |
| `CONFIG_ZMK_BLE_PASSKEY_ENTRY` | bool | Experimental: require typing passkey from host to pair BLE connection | n |
| `CONFIG_ZMK_BLE_PASSKEY_ENTRY` | bool | Experimental: require typing passkey from host to pair BLE connection | n |
| `CONFIG_ZMK_SPLIT` | bool | Enable split keyboard support | n |
| `CONFIG_ZMK_SPLIT` | bool | Enable split keyboard support | n |
| `CONFIG_ZMK_SPLIT_BLE` | bool | Use BLE to communicate between split keyboard halves | y |
| `CONFIG_ZMK_SPLIT_BLE` | bool | Use BLE to communicate between split keyboard halves | y |
| `CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL` | bool | `y` for central device, `n` for peripheral | |
| `CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL` | bool | `y` for central device, `n` for peripheral | |
| `CONFIG_ZMK_SPLIT_BLE_CENTRAL_POSITION_QUEUE_SIZE` | int | Max number of key state events to queue when received from peripherals | 5 |
| `CONFIG_ZMK_SPLIT_BLE_CENTRAL_POSITION_QUEUE_SIZE` | int | Max number of key state events to queue when received from peripherals | 5 |
| `CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_STACK_SIZE` | int | Stack size of the split peripheral BLE notify thread | 512 |
| `CONFIG_ZMK_BLE_SPLIT_CENTRAL_SPLIT_RUN_STACK_SIZE` | int | Stack size of the BLE split central write thread | 512 |
| `CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_PRIORITY` | int | Priority of the split peripheral BLE notify thread | 5 |
| `CONFIG_ZMK_BLE_SPLIT_CENTRAL_SPLIT_RUN_QUEUE_SIZE` | int | Max number of behavior run events to queue to send to the peripheral(s) | 5 |
| `CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_STACK_SIZE` | int | Stack size of the BLE split peripheral notify thread | 650 |
| `CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_PRIORITY` | int | Priority of the BLE split peripheral notify thread | 5 |
| `CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_POSITION_QUEUE_SIZE` | int | Max number of key state events to queue to send to the central | 10 |
| `CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_POSITION_QUEUE_SIZE` | int | Max number of key state events to queue to send to the central | 10 |
Note that `CONFIG_BT_MAX_CONN` and `CONFIG_BT_MAX_PAIRED` should be set to the same value. On a split keyboard they should only be set for the central and must be set to one greater than the desired number of bluetooth profiles.