How to know a value of a characteristic is changed

[KDW_uwblab]

Hello guys, i'm using nRF52832-DK with S132_v3.1.0 and SDK v12.2.0.

When other BLE device write some value to my characteristic, how do i know

that my characteristic's value is changed without using sd_ble_gatts_value_get() function.

i think that using "sd_ble_gatts_value_get() function" to check my characteristic's value was changed is too inefficient way ;;

please, i needs your help!

[John]

I think you should get a BLE_GATTS_EVT_WRITE event when the characteristic is written. In the event handler you can check if the handle of the written event corresponds to your characteristic and deal with it appropriately.

[Ameer Usman]

You can check it in the ble_evt_handler function and put BLE_GATTS_EVT_WRITE which will record if a new function is written. See image below for reference: