https://devzone.nordicsemi.com/f/nordic-q-a/47389/is-sd_ble_gatts_hvx-api-thread-safeHi, Are softdevice&#39;s api calls thread safe (specifically speaking sd_ble_gatts_hvx ()) - i.e. Will a concurrent call to sd_ble_gatts_hvx () from several threads corrupt the data sent (SDK 14.2) Or, does the sd uses some type of atomic queueingen-USTelligent Community 13Mon, 20 May 2019 12:16:16 GMThttps://devzone.nordicsemi.com/thread/187900?ContentTypeID=1Mon, 20 May 2019 12:16:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:626d92fe-c0db-49a0-860e-04a22b21ff22Edvin<p>Hello,</p> <p>Yes. The softdevice calls are thread safe. Remember to check the return value when using the softdevice calls. If sd_ble_gatts_hvx() returns NRF_SUCCESS (0) then the packet is queued internally in the softdevice, and you can queue more packets at once, from different places in your project.&nbsp;</p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>