https://devzone.nordicsemi.com/f/nordic-q-a/24362/how-to-know-a-value-of-a-characteristic-is-changedHello guys, i&#39;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&#39;s value is changed without using sd_ble_gatts_value_get() function. i thinken-USTelligent Community 13Thu, 10 Oct 2019 06:34:41 GMThttps://devzone.nordicsemi.com/thread/214264?ContentTypeID=1Thu, 10 Oct 2019 06:34:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9e2fffc7-b80a-44dc-8b2c-c2a136e8215eAmeer Usman<p>You can check it in the&nbsp;<strong>ble_evt_handler&nbsp;</strong>function and put&nbsp;<strong>BLE_GATTS_EVT_WRITE&nbsp;</strong>which will record if a new function is written. See image below for reference:<br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1570689253001v2.png" alt=" " /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95922?ContentTypeID=1Tue, 15 Aug 2017 13:28:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a0c11511-a5c8-4491-82e9-5a8aa3cf1f99John<p>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.</p><div style="clear:both;"></div>