nrf connect sdk - generic discovery and reading/writing Gatt services and characteristics

[Paul Clark]

I would like to use the nrf connect sdk to connect to a device and 'discover' the GATT services it supports, the characteristics in each service, and then read the descriptions/values for each characteristic.

I would prefer the software to have no knowledge of the target Peripheral.

I would then like to update (write) some of the the characteristic values.

Do you have any samples or guidance on how the GATT discovery/read/write can be achieved? The samples I have seen appear to 'ask the peripheral' if they support a particular service/uuid.

[Amanda Hsieh]

Hi, 

Have a look at this Bluetooth: Peripheral GATT Discovery Manager sample. 

Regards,
Amanda

[Paul Clark]

Hi - I have seen this sample, and implemented something similar - however it isn't clear to me how the 

discover_all_completed callback would be modified to read the details of each characteristic (description, value)

[Amanda Hsieh]

Hi,

You can take a look at this tutorial and https://github.com/nrfconnect/sdk-nrf/blob/main/samples/bluetooth/central_uart/src/main.c#L285 on how to handle GATT client on the central. 

-Amanda