https://devzone.nordicsemi.com/f/nordic-q-a/1951/idle-ble-message-receive-without-advertisingIs there a way to have a device ready to receive a message (while the BLE stack is initiated) without advertising? For our product, we will be having potentially hundreds of units near each other, and they all need to be able to connect to a host device;en-USTelligent Community 13Fri, 21 Mar 2014 09:51:36 GMThttps://devzone.nordicsemi.com/thread/8400?ContentTypeID=1Fri, 21 Mar 2014 09:51:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d2784bc-29fc-4f3e-9821-24b065860130Ole Morten<p>This sounds very similar to the question <a href="http://stackoverflow.com/questions/22097079/is-it-possibile-to-wake-up-a-deep-sleep-ble-device-in-android-sdk">here</a>, so I&#39;d recommend you to take a look at it. In summary, if the device never turns on its radio (which it doesn&#39;t if it isn&#39;t advertising), there is no way to wake it up.</p> <p>I would therefore recommend you to let all devices always advertise, although potentially with a long advertising interval if you want to conserve power. The device selection can be done for instance based on using unique names, or including some kind of manufacturer specific data in the advertisement packet that differentiates the different devices.</p><div style="clear:both;"></div>