https://devzone.nordicsemi.com/f/nordic-q-a/24258/what-is-the-differences-between-ble_nus-and-ble_nus_cIn &quot;ble_nus_c&quot; file we can get nus_data with &quot;ble_nus_c_evt_handler&quot; function. We can do the same with &quot;nus_data_handler&quot; in &quot;ble_nus&quot; file. So why are there two separate ble_nus files? Also on a device I have defined as peripheral (sdk8.0.0 s110) I geten-USTelligent Community 13Fri, 11 Aug 2017 05:53:44 GMThttps://devzone.nordicsemi.com/thread/95497?ContentTypeID=1Fri, 11 Aug 2017 05:53:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7182a98a-6dc8-41c6-89aa-3fa5455d3a07Nguyen Hoan Hoang<p>each of them has its own data handler. They are not the same. You can&#39;t mixed them. Please see the examples in the SDK how to use it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95496?ContentTypeID=1Fri, 11 Aug 2017 05:47:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c36b25a4-f7a7-403f-81ef-dcfbfdd43a7dpurgoufr<p>Can I use ble_nus(&quot;nus_data_handler&quot;) on central mode?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/95495?ContentTypeID=1Fri, 11 Aug 2017 05:45:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4f7d5bf4-5759-4d4b-acef-c23a13e67f5aNguyen Hoan Hoang<p>ble_nus_c is the Central mode. This mode is equivalent to the phone.<br /> ble_nus is peripheral mode. This mode is the device.</p> <p>You can have 2 nRF5 talking to each other where one is running ble_nus and other running ble_nus_c.</p><div style="clear:both;"></div>