https://devzone.nordicsemi.com/f/nordic-q-a/4328/j-link-server-cannot-connect-to-target-nrf51822Hi all, I&#39;m trying to follow this Nordic blog post in order to use Luna Eclipse, GDB and J-link for debugging of ble_app_hrs from Nordic SDK 6.1 on a PCA10001 It is going well, I can compile, and Eclipse can check syntax etc. However, debuggingen-USTelligent Community 13Wed, 05 Nov 2014 20:20:49 GMThttps://devzone.nordicsemi.com/thread/15414?ContentTypeID=1Wed, 05 Nov 2014 20:20:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:91bd96f4-b2e5-4134-bd9b-7c4ab68c28f6klaus<p>Thanks! It works now</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15413?ContentTypeID=1Wed, 05 Nov 2014 07:36:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:21b97fbc-f93f-4954-b504-77fc27065e96Vidar Berg<p>Hi,the JTAG debug interface is not available on the nRF51 so you need to use <a href="http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0480c/Chddgbee.html">SWD</a>. See chapter 11 in <a href="https://www.nordicsemi.com/eng/nordic/Products/nRF51822/nRF51-RM/20337">nRF51 RM</a> for more details.</p><div style="clear:both;"></div>