https://devzone.nordicsemi.com/f/nordic-q-a/50071/how-to-use-psm-with-udp-on-dk-0-8-5I&#39;ve been attempting to use PSM but got an error. I&#39;ve already checked the post below. I download the project file and fixed a bit. https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/measuring-psm-idle-current-on-theen-USTelligent Community 13Mon, 22 Jul 2019 12:22:11 GMThttps://devzone.nordicsemi.com/thread/199781?ContentTypeID=1Mon, 22 Jul 2019 12:22:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43c95e2b-a36d-4ce8-9512-088e7c3e690dYusuke<p>Thank you so much!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/199702?ContentTypeID=1Mon, 22 Jul 2019 09:10:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5b04f4b3-ff27-4d50-a981-3904c0adb41aCarl Richard<p>Hello, Yusuke!<br /><br />Comparing with the original sample it seems like you have removed the line freeing the memory for&nbsp;<strong>res</strong> inside&nbsp;<strong>app_udp_start()</strong>. This will lead to undefined behavior and potential errors.<br />The end of the function is supposed to look like this:<br /><pre class="ui-code" data-mode="c_cpp">error: freeaddrinfo(res); // ---- You have removed this line ---- printk(&quot;Finished\n&quot;); (void)close(client_fd);</pre><br />I did not get the error when I added this to your code.<br /><br />Note that the iBasis card don&#39;t have support for PSM as far as I know. I recommend you to get another provider.<br /><br />All the best<br />Carl Richard</p><div style="clear:both;"></div>