Microhip Transparent UART Service for BM70/RN4870

The Microchip Transparent UART Service available on the BM70/RN4870 BLE modules is used in this help guide to demonstrate an example using Android OS to connect with the BM70/RN4870 BLE modules. These modules support the Transparent UART Service and transfer data bidirectionally. This section provides the details of the Microchip Transparent UART Service and Characteristics UUIDs as well as access properties as they are used in the next section.

As a GATT Server, the BM70/RN4870 hosts the Microchip Transparent UART Service. The Transparent UART Service provides a simple bidirectional data transfer service. It defines two characteristics for data communication, one for receiving data with the Write property and the other for sending data with the Notify property. The Microchip Transparent UART Service is instantiated as a Primary Service on the BM70/RN4870 BLE module by default.

The UUIDs and access properties of the Microchip Transparent UART service and its characteristics are shown in the table below.

Service Name UUID
Microchip Transparent UART 49535343-FE7D-4AE5-8FA9-9FAFD205E455
Characteristic Name UUID Properties
Microchip Transparent UART TX 49535343-1E4D-4BD9-BA61-23C647249616 Notify, Write, Write without response
Client Characteristic Descriptor Read, Write
Microchip Transparent UART RX 49535343-8841-43F4-A8D4-ECBE34729BB3 Write, Write without response

Transparent TX Characteristic

This characteristic is used for data transmission by Server or Client. Once the notification is enabled using the Client Characteristic Configuration Descriptor of Transparent TX by the Client, the Server sends data to the Client whenever it is updated by the Server. Optionally, the Client also can send data through this characteristic.

Transparent RX Characteristic

This characteristic is used for data transmission by the Client. The Client can send data to the Server by performing a Write operation on this characteristic.

The Microchip Transparent UART Service and its Characteristics are enumerated in the MCHP Transparent UART Android app example as shown in the screenshot below and will be used by the Android app as the GATT Client. Note the matching 128-bit UUIDs associated with the service and characteristics in the screenshot and the table above.

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