https://devzone.nordicsemi.com/f/nordic-q-a/6132/using-s120-as-a-centralHi, I have a BLE peripheral with a custom service (using a different chipset). I&#39;m working with S120 as a central, and attempting to read/write various characteristics in my peripheral. There are a lot of examples in the nRF51 SDK using nRF51x asen-USTelligent Community 13Fri, 20 Mar 2015 12:18:30 GMThttps://devzone.nordicsemi.com/thread/21469?ContentTypeID=1Fri, 20 Mar 2015 12:18:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f3113b0e-e6fd-4ecf-b9bb-54c533ea00c4Hung Bui<p>@Mike: I don&#39;t think we have other client service library besides ble_ias_c,ble_ans_c, ble_cts_c and ble_bas_c, ble_hrs_c.</p> <p>The S110 was developed much earlier than the S120. So the material for S110 is more adequate.</p> <p>However I don&#39;t think it would be too tricky to implement one on your own based on what we do with ble_hrs_c for example.</p> <p>In addition, we also have an example on client for 128bit UUID proprietary service, you can refer <a href="https://github.com/NordicSemiconductor/ble_app_uart_c_S120">here</a>.</p><div style="clear:both;"></div>