nRF52 -- HID Get Feature Report from Host

[IL]

Hi Sir,

I am going to the same phenomenon as below.

https://devzone.nordicsemi.com/f/nordic-q-a/45554/sdk-15-2-how-to-set-a-value-to-a-hid-feature-report

Can someone help me understand the reasons for this question?

[Simon]

Could you be more specific? What is your problem exactly? The question regarding sd_ble_gatts_value_set() or the question regarding link context manager? The developer in the provided link also posted an answer. What specifically about this did you not understand?

Best regards,

Simon

[IL]

What is sd_ble_gatts_value_set() actually do? It seems not really update to the database of server side. Or I should only do blcm_link_ctx_get() to write database?

[Simon]

As mentioned here, the function sd_ble_gatts_value_set() can update the local database on the server side as well as notifying it to the client. Read more here for a more detailed explanation of the function.

How do you confirm that the database on the server side is not updated? Try to read ble_gatts_hvx_params_t::p_len after calling sd_ble_gatts_value_set(), if it is a non-zero value, then you know the database has been updated.

Best regards,

Simon