Datasheet

# Clear any previous custom services/characteristics

AT+GATTCLEAR

# Add a battery service (UUID = 0x180F) to the peripheral

AT+GATTADDSERVICE=UUID=0x180F

# Add a battery measurement characteristic (UUID = 0x2A19), notify enabled

AT+GATTADDCHAR=UUID=0x2A19,PROPERTIES=0x10,MIN_LEN=1,VALUE=100

# Clear any previous custom services/characteristics

AT+GATTCLEAR

# Add a custom service to the peripheral

AT+GATTADDSERVICE=UUID128=00-11-00-11-44-55-66-77-88-99-AA-BB-CC-DD-EE-FF

# Add a custom characteristic to the above service (making sure that there

# is no conflict between the 16-bit UUID and bytes 3+4 of the 128-bit service UUID)

AT+GATTADDCHAR=UUID=0x0002,PROPERTIES=0x02,MIN_LEN=1,VALUE=100

Version 0.6.6 of the Bluefruit LE firmware added the ability to use a new 'UUID128' flag to add custom 128-bit UUIDs

that aren't related to the parent service UUID (which is used when passing the 16-bit 'UUID' flag).

To specify a 128-bit UUID for your customer characteristic, enter a value resembling the following syntax:

# Add a custom characteristic to the above service using a

# custom 128-bit UUID

AT+GATTADDCHAR=UUID128=00-11-22-33-44-55-66-77-88-99-AA-BB-CC-DD-EE-

FF,PROPERTIES=0x02,MIN_LEN=1,VALUE=100

Version 0.7.0 of the Bluefruit LE firmware added the new DESCRIPTION and PRESENTATION keywoards,

corresponding the the GATT Characteristic User Description (https://adafru.it/oIA) and the GATT Characteristic

Presentation Format (https://adafru.it/oIB) Descriptors.

The DESCRIPTION field is a string that contains a short text description of the characteristic. Some apps may not

display this data, but it should be visible using something like the Master Control Panel application from Nordic on iOS

and Android.

The PRESENTATION field contains a 7-byte payload that encapsulates the characteristic presentation format data. It

requires a specific set of bytes and values to work properly. See the following link for details on how to format the

payload: https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?

u=org.bluetooth.descriptor.gatt.characteristic_presentation_format.xml (https://adafru.it/oIB)