https://devzone.nordicsemi.com/f/nordic-q-a/63416/nrf52840-sdk16---manipulate-ble-eventsHi everyone, I am writting a custom firmware and I am stacked on how to manipulate properly BLE events. First of all I have a handler function that listens for BLE events, If the BLE_GATTS_EVT_WRITE (see ble_gatts.h) is received then I call the on_writeen-USTelligent Community 13Mon, 17 Aug 2020 09:11:25 GMThttps://devzone.nordicsemi.com/thread/264798?ContentTypeID=1Mon, 17 Aug 2020 09:11:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0bc9c69f-10e7-4055-8848-c0c5aadf78d5ovrebekk<p>Glad to hear it Nick, the best of luck with your project <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/264708?ContentTypeID=1Sun, 16 Aug 2020 14:39:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:53c458f0-68d9-40bf-818e-457a69836db7Nikosant03<p>Thank you ovrebekk!!</p> <p>That solved my issue!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/258675?ContentTypeID=1Mon, 06 Jul 2020 17:01:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65445de1-0ca6-4234-bcf1-ad05bd9a3b68ovrebekk<p>Hi Nick</p> <p>Since you declare the evt variable inside the on_write function it will be an automatic variable,&nbsp;which is located on the call stack. After leaving on_write() it will be removed from the stack, and other variables might be put on the stack in the same memory location.&nbsp;</p> <p>In order for it to retain it&#39;s value between calls to on_write(..) you should declare it static:</p> <p><pre class="ui-code" data-mode="text">static ble_cus_evt_t evt;</pre></p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>