https://devzone.nordicsemi.com/f/nordic-q-a/2681/s120-uart-communicationHi, I&#39;m trying to make BLE hardwares on both s110 and s120. There are two devicees one for S110 peripheral and the other for s120 central. S110 pheriperal device has to functions. Using general profile, communicate with phone, something likeen-USTelligent Community 13Thu, 05 Jun 2014 12:03:55 GMThttps://devzone.nordicsemi.com/thread/10514?ContentTypeID=1Thu, 05 Jun 2014 12:03:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41979fa9-38eb-44cd-b207-9059f5f86d7bFormerMember<p>If you understand the workflow of how to develop with S110, S120 would be quite similar. An initial difference is that with S120, scanning of the advertisements must be done to find out if there is a device which needs to be connected with. Then connect with it. After that you can the GATT part is quite similar to S110. I&#39;ve attached the main file (Sorry, its messy) of an example in the SDK that I have modified to make is much simpler (removed the device database, whitelisting etc.). Hope this will put you in the right direction. Regards, Prithvi<a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/3716.main.c">C:\fakepath\main.c</a></p><div style="clear:both;"></div>