Datasheet

UART Service

Base UUID: 6E400001-B5A3-F393-E0A9-E50E24DCCA9E

This service simulates a basic UART connection over two lines, TXD and RXD.

It is based on a proprietary UART service specification by Nordic Semiconductors. Data sent

to and from this service can be viewed using the nRFUART apps from Nordic

Semiconductors for Android and iOS.

Characteristics

Nordic’s UART Service includes the following characteristics:

R = Read; W = Write; N = Notify; I = Indicate

TX (0x0002)

This characteristic is used to send data back to the sensor node, and can be written to by the

connected Central device (the mobile phone, tablet, etc.).

RX (0x0003)

This characteristic is used to send data out to the connected Central device. Notify can be

enabled by the connected device so that an alert is raised every time the TX channel is

updated.

This service is available on every Bluefruit LE module and is automatically started

during the power-up sequence.

Name

Mandatory

Yes

UUID

0x0002

0x0003

Type

U8[20]

Characteristic names are assigned from the point of view of the Central device