Nordic UART Service (NUS)
The Bluetooth® Low Energy (LE) GATT Nordic UART Service is a custom service that receives and writes data and serves as a bridge to the UART interface.
The NUS Service is used in the Bluetooth: Peripheral UART sample. It is also included with the Thingy:91 Connectivity bridge, but is disabled by default, and with the Matter door lock sample, as an optional feature that extends the Bluetooth LE connectivity.
Service UUID
The 128-bit vendor-specific service UUID is 6E400001-B5A3-F393-E0A9-E50E24DCCA9E (16-bit offset: 0x0001).
Characteristics
This service has two characteristics.
RX Characteristic (6E400002-B5A3-F393-E0A9-E50E24DCCA9E)
- Write or Write Without Response
Write data to the RX Characteristic to send it to the UART interface.
TX Characteristic (6E400003-B5A3-F393-E0A9-E50E24DCCA9E)
- Notify
Enable notifications for the TX Characteristic to receive data from the application. The application transmits all data that is received over UART as notifications.
API documentation
include/bluetooth/services/nus.hsubsys/bluetooth/services/nus.c