https://devzone.nordicsemi.com/f/nordic-q-a/579/deinit-the-stackHi, Let&#39;s say that you have a processor and a nRF51822 as a coprocessor. The first processor sends commands to the nRF51822 to drive it (init the stack, init the services, start advertising...). Let&#39;s say that you want to run two different BLE applicationsen-USTelligent Community 13Wed, 02 Oct 2013 11:20:26 GMThttps://devzone.nordicsemi.com/thread/3007?ContentTypeID=1Wed, 02 Oct 2013 11:20:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43666ef0-db50-4dd7-8856-e00e3628a25bOle Morten<p>Calling sd_ble_softdevice_disable() will disable the softdevice, and this also clears the GATT table and all stored state in the softdevice. This should therefore be a reasonable way to switch between applications.</p> <p>You can put an nRF51822 to sleep at any time, and the wake-up capabilities will depend on the sleep mode and enabled peripherals. You can take a look at <a href="https://devzone.nordicsemi.com/index.php/what-is-the-power-and-clock-model-of-peripheral-in-nrf51">this question</a>, which tries to explain that.</p> <p>Also, if you put the chip in system off mode, a wakeup will cause a reset anyway, in which case all state of the softdevice is lost anyway.</p><div style="clear:both;"></div>