BM70 Compact Demo Board User's Guide

Appendix G. Transparent UART


The Transparent UART Service is instantiated as a Primary Service. The service UUID of the Transparent UART Service is set to 49535343-FE7D-4AE5-8FA9-9FAFD205E455. The Transparent UART Service contains the following data characteristics:

  • Transparent UART Transmit (TX) Characteristic.
  • Transparent UART Receive (RX) Characteristic.

The Transparent UART TX Characteristic is used for data transmission by the server or the client. Once the Client Characteristic Configuration Descriptor (CCCD) of the Transparent UART TX Characteristic is enabled, the server sends data to the client using the Notify property. The client can also send data to the server using the Write/Write Without Response properties.

The Transparent UART RX Characteristic is used for data transmission by the client. The client can send data to the server using the Write/Write Without Response properties.

The UUIDs and the properties of the data characteristics are captured in Table G-1.

Characteristic Name UUID Properties
Transparent UART TX 49535343-1E4D-4BD9-BA61-23C647249616 Notify, Write, Write without response
Transparent UART RX 49535343-8841-43F4-A8D4-ECBE34729BB3 Write, Write without response
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