https://devzone.nordicsemi.com/f/nordic-q-a/4205/softdevice-s120---data-exchange-in-piconetHi, We need to develop piconet where each device able initiate receiving and transmitting data. According to a Bluetooth Core V4.0 specification this topology named like &quot;scatternet operation&quot;. So, 2 masters (cerntal roles) should establish connectionen-USTelligent Community 13Fri, 31 Oct 2014 08:53:29 GMThttps://devzone.nordicsemi.com/thread/15020?ContentTypeID=1Fri, 31 Oct 2014 08:53:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41171488-2ad2-4b39-8124-4bc8f81064b1Alex<p>Thank you Petter.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15019?ContentTypeID=1Thu, 30 Oct 2014 12:16:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a9c95a19-22c6-4267-85af-0c7caff8c010Petter Myhre<p>Sorry I was unclear, edited my answer.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15018?ContentTypeID=1Mon, 27 Oct 2014 13:44:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8d841f71-f0be-4325-926d-29909a5b537cAlex<p>Petter, Thanks for a reply and could you please explain a little bit more about difference between S120 and S130 ? You mention interesting point that S120 can be a slave. In S120 Key Features mentioned that Device support</p> <ul> <li>Central and Observer roles - up to 8 simultaneous connections According to this I understand that S120 not able to be a slave. Could you please clarify this ? If S120 may work in slave mode and dynamically switch to Master it will be great. But I don’t see any proof of that from specifications.</li> </ul><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15017?ContentTypeID=1Mon, 27 Oct 2014 12:30:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32ee44fa-9762-4ef4-916d-310681fe6e9fPetter Myhre<p>According to Figure 1.1 in Volume 2, Part B?</p> <p>I believe the blue circle with black dot in Figure 1.1c is a combined master and/or slave. It is a master to the slaves, and slave to the master.</p> <p>The S120 can be a master(central) <strong>or</strong> a slave(peripheral).</p> <p>The S130 can be a master(central) <strong>and</strong> a slave(peripheral)</p> <p>Edit: The S120 version 1.x.x can only be a central, while the S120 version 2.x.x can be a central or a peripheral. Currently this is an alpha release (2.0.0-1.alpha), please see the download tab in the product page.</p> <p>The difference is between S120 and S130 is that the S130 can be a central and a peripheral at the same time, while the S120 cannot.</p><div style="clear:both;"></div>