BLE Advertisement package....Adding data to the packet.

[jfizzle]

I am new to BLE and want to learn what options and methods I have available to alter the advertisement package. Is it possible to include a floating point value, that could be actively updating, in the packet. I have been advised of items "Characteristic Presentation Format Descriptor" in the Generic Attribute Profiles. Is this available in the BLE.gap.h used in nRf52832 SOC modules.  I would like to continually present an accumulated running time of a piece of equipment in the advertisement.  For example..Pump Hours = 1234.67

[Hakon]

It should be possible. In the BLE spec it says that the format field of the descriptor should be set to 20 or 21 for 32- or 64-bit floating point respectively.

[jfizzle]

I am reviewing the Nordic doc at:

 https://github.com/adafruit/Adafruit_nRF52_Arduino/blob/master/cores/nRF5/nordic/softdevice/s132_nrf52_6.1.1_API/include/ble_gap.h#L262

I do not find anything defined as Characteristic Presentation Format Descriptor.  Is there a different Nordic document that may describe haw that would be used with the nRf52380?

[Hakon]

jfizzle said:

I do not find anything defined as Characteristic Presentation Format Descriptor.

 It's in ble_types.h. In ble_types.h it's defined as

#define BLE_UUID_DESCRIPTOR_CHAR_PRESENTATION_FORMAT  0x2904 /**< Characteristic Presentation Format Descriptor. */