https://devzone.nordicsemi.com/f/nordic-q-a/16926/ble-invalid-lmp-parametersHi, I&#39;m working on nRF51822 with SDK 11.0.0 softdevice s130 I have an nRF module acting as central and smartphones (iOS and Android) acting as peripheral. I tested all iPhone frome 4S to 6S and I had no problem I tested Samsung Galaxy S5 and Samsungen-USTelligent Community 13Mon, 10 Oct 2016 09:22:40 GMThttps://devzone.nordicsemi.com/thread/64893?ContentTypeID=1Mon, 10 Oct 2016 09:22:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cddbfe47-4959-49f2-b960-0fda48a664d7FormerMember<p>From Bluetooth Core Specification v.4.3, Vol 2, Part D, chapter 2.30, the error code invalid LMP parameters should occur when:</p> <blockquote> <p>The Invalid LMP Parameters / Invalid LL Parameters error code indicates that some LMP PDU / LL Control PDU parameters were invalid. This shall be used when:</p> <ul> <li> <p>the PDU length is invalid.</p> </li> <li> <p>a parameter is odd when it is required to be even.</p> </li> <li> <p>a parameter is outside of the specified range.</p> </li> <li> <p>two or more parameters have inconsistent values.</p> </li> </ul> </blockquote> <p>Could you use <a href="https://www.nordicsemi.com/eng/nordic/download_resource/26386/14/65517724">the sniffer</a> to check what is being transferred before this error occurs? And also upload the sniffer trace here?</p> <p>The sniffer should be used with Wireshark, and it works best with version 1.10, not one of the newer versions. Wireshark can be downloaded here:</p> <ul> <li><a href="https://www.wireshark.org/download/win32/all-versions/">www.wireshark.org/.../</a></li> <li><a href="https://www.wireshark.org/download/win64/">www.wireshark.org/.../</a></li> </ul><div style="clear:both;"></div>