https://devzone.nordicsemi.com/f/nordic-q-a/121745/gopro-control-over-ble-write-char-issueHello. I&#39;m trying to control a GoPro camera via ble. Gopro has documentation that describes the available services and chars, as well as the exchange protocol ( https://gopro.github.io/OpenGoPro/ble/ ). At the moment I am trying to send a commanden-USTelligent Community 13Fri, 23 May 2025 12:58:57 GMThttps://devzone.nordicsemi.com/thread/536786?ContentTypeID=1Fri, 23 May 2025 12:58:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dc38a8b1-f402-41a6-a69d-982518d7dad7D233374<p>03 01 01 01 command to start record</p> <p>03 01 01 00 command to stop record</p> <p>The difference is that&nbsp; &quot;handle&quot; tab has [Service UUID...] in message from nRF Connect and only [UUID .. ] from my code.&nbsp;</p> <p>The byte values ​​I send make no difference in this case.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/536784?ContentTypeID=1Fri, 23 May 2025 12:45:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0bf5787d-3721-4f4e-86bb-ea27ec34f08cSigurd<p>Hi!</p> [quote user=""]I used a sniffer to see what is happening and compare the command that I send from the phone via nRF Connect and from my code.[/quote] <p>Seems like they are sending 2 different values as well.</p> <p>nRF Connect:<br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1748004230442v1.png" alt=" " /></p> <p>Your code:<br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1748004242872v2.png" alt=" " /></p> <p>From the log:<br />&lt;debug&gt; app: Send 4 bytes data on handle 0x38<br />&lt;debug&gt; app: 03 01 01 01 |.... <br /><br />Maybe it works better if you send the same value as with&nbsp;<span>nRF Connect?&nbsp;03 01 01 00</span></p> <p></p><div style="clear:both;"></div>