https://devzone.nordicsemi.com/f/nordic-q-a/428/which-service-to-use-for-generic-dataI need to have an iOS device send my nRF51 some commands, some settings, and retrieve some data, not at regular intervals. The nRF51 should only-speak-when-spoken-to. I&#39;m looking at all of the possible Bluetooth &quot;services&quot; and none of them seems likeen-USTelligent Community 13Wed, 09 Oct 2013 12:14:06 GMThttps://devzone.nordicsemi.com/thread/2196?ContentTypeID=1Wed, 09 Oct 2013 12:14:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81f263f3-ce66-4687-be9a-6bd15c0429f6Ole Morten<p>An application note explaining how to build a custom service is now out. Get it <a href="https://www.nordicsemi.com/eng/nordic/download_resource/24020/2/80193304">here</a>!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/2195?ContentTypeID=1Sat, 07 Sep 2013 18:46:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:33b6b2c0-ab47-48eb-9365-f7185b9f8d81wlgrd<p>You can create your own service, with an arbitrary UUID and send data to this service, creating your own characteristic and handlers to write data to the nRF51.</p> <p>You can use the notification service to send data to the iOS-device whenever the nRF51 has some data to send. This can be a bit tricky, but by using the example projects provided you should be able to derive how to set up your own service.</p><div style="clear:both;"></div>