https://devzone.nordicsemi.com/f/nordic-q-a/17227/nrf51822ab-better-sdHi everyone! I made some board with 51822 (128k, 16k). I have only 20kb free if I use the S130. The questions: a) I only will sent data to a mobile. Can I use the S110 that it&#39;s more lightweight (some kb)? However I noted &quot;there is no support&quot; inen-USTelligent Community 13Mon, 24 Oct 2016 22:53:19 GMThttps://devzone.nordicsemi.com/thread/66192?ContentTypeID=1Mon, 24 Oct 2016 22:53:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7f2d91a-ad87-4e96-8b6b-6bf5f0f66c94Lean<p>Hi Petter, thank for your answer. If you so kind, could you awswer the part b) about the most efficient way to transmit data over BLE. I need you advice to advance in correct way</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/66191?ContentTypeID=1Mon, 24 Oct 2016 09:15:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a34736c7-0d39-459f-a2c1-1625f9ceae12Petter Myhre<p>a) Yes, you can use S110, if you don&#39;t need the S130 features. It is supported by SDK 10, so I would use that.</p> <p>If you need more flash/RAM you should use another <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51822_ic_revision_overview.html?cp=3_0_1">version of the nRF51822</a> chip.</p> <p>b) Which service your use isn&#39;t that relevant, but you should use notifications/write commands. There are several questions about this already, please search. <a href="https://devzone.nordicsemi.com/question/1741/dealing-large-data-packets-through-ble/">This</a> for example.</p> <p>Edit: Added b</p><div style="clear:both;"></div>