Datasheet

The following example shows how you might use both of these new fields:

AT+GATTADDCHAR=UUID=0x2A37, PROPERTIES=0x10, MIN_LEN=2, MAX_LEN=3, VALUE=00-40,

DESCRIPTION=HRM Measurement, PRESENTATION=17-00-AC-27-01-00-00

For the Characteristic Presentation Format we have:

Format = IEEE-11073 32-bit FLOAT (Decimal 23, Hex 0x17)

Exponent = 0/None

Unit = Thermodynamic temperature: Degrees Fahrenheit (0x27AC) - Bluetooth LE Unit List (https://adafru.it/oID)

Namespace = Bluetooth SIG Assigned Number (0x01)

Description = None (0x0000)

The results from Nordic's Master Control Panel app can be seen below:

AT+GATTCHAR

Gets or sets the value of the specified custom GATT characteristic (based on the index ID returned when the

characteristic was added to the system via AT+GATTADDCHAR).

Codebase Revision: 0.3.0

Parameters: This function takes one or two comma-separated functions (one parameter = read, two parameters =

write).

The first parameter is the characteristic index value, as returned from the AT+GATTADDCHAR function. This

parameter is always required, and if no second parameter is entered the current value of this characteristic will

be returned.

The second (optional) parameter is the new value to assign to this characteristic (within the MIN_SIZE and

MAX_SIZE limits defined when creating it).

Response: If the command is used in read mode (only the characteristic index is provided as a value), the response will

display the current value of the characteristics. If the command is used in write mode (two comma-separated values

are provided), the characteristics will be updated to use the provided value.