https://devzone.nordicsemi.com/f/nordic-q-a/22912/what-is-the-purpose-of-the-hvx-offset-parameter-and-how-is-it-usedI have created a characteristic for sending up to 60 data bytes in a buffer using a sequence of 20 byte notifications sent to an external device. This works quite well for rapidly streaming out the data. I trigger streaming notifications on a write toen-USTelligent Community 13Tue, 20 Jun 2017 12:09:05 GMThttps://devzone.nordicsemi.com/thread/90127?ContentTypeID=1Tue, 20 Jun 2017 12:09:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1863ebe5-80d0-4d76-99e2-f8501afc75ebPetter Myhre<p>The value of the offset sets where in the attribute value the data should be updated. So if you have a 30 byte attribute value size, a data length of 20, and an offset of 0 you will update the 20 first bytes, if you have a offset of 10 you will update the 20 last bytes. The offset shouldn&#39;t have anything to do with the notification size, that should be determined by the data length (p_len).</p><div style="clear:both;"></div>