Trouble generating NFC T4T messages in Zephyrhttps://devzone.nordicsemi.com/f/nordic-q-a/90635/trouble-generating-nfc-t4t-messages-in-zephyrI&#39;m attempting to create an NFC type 4 message to allow certain information to be read using a phone or other NFC reader. I&#39;ve studied a number of examples, but none that does exactly what I want, i.e. Type 4 text records. The nearest I&#39;ve found is theen-USTelligent Community 13Wed, 03 Aug 2022 23:57:40 GMTRE: Trouble generating NFC T4T messages in Zephyrhttps://devzone.nordicsemi.com/thread/379994?ContentTypeID=1Wed, 03 Aug 2022 23:57:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0b7cacbb-e631-4490-ab5a-1aa9de1fadfbFrog<p>Further update: I&#39;ve resolved this; it turns out that calling</p> <div style="background-color:#1e1e1e;color:#d4d4d4;font-family:Consolas, &#39;Courier New&#39;, monospace;font-size:14px;font-weight:normal;line-height:19px;white-space:pre;"> <div><span style="color:#dcdcaa;">nfc_t4t_ndef_rwpayload_set()</span></div> </div> <p>with a buffer_length that&#39;s not at least a few bytes more than the actual length of the NDEF message causes the problem.&nbsp; I haven&#39;t got to the bottom of exactly how many bytes extra are needed, but with a message of about 120 bytes I have found that specifying 256 bytes (in my case the size of the available buffer rather than the content) is successful.</p><div style="clear:both;"></div>RE: Trouble generating NFC T4T messages in Zephyrhttps://devzone.nordicsemi.com/thread/379990?ContentTypeID=1Wed, 03 Aug 2022 23:10:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:50ba8095-bad1-4d99-8059-1f232850a6d7Frog<p>Update: I&#39;m using an iPhone 12 and have installed the slightly more helpful NXP TagInfo app.&nbsp; This tells me &#39;No NDEF Records&#39;, although reading the device using the ACR122 reader and script tool outputs what appears to be valid NDEF records.</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1659568218216v1.png" alt=" " /></p> <p>I know that this isn&#39;t much to go on but it&#39;s all I have at this point.</p><div style="clear:both;"></div>