Maximum fixed-length attribute length vs Maximum variable-length attribute lengthhttps://devzone.nordicsemi.com/f/nordic-q-a/12823/maximum-fixed-length-attribute-length-vs-maximum-variable-length-attribute-lengthIn ble_gatts.h, I see: #define BLE_GATTS_FIX_ATTR_LEN_MAX (510) //&lt; Maximum length for fixed length Attribute Values. #define BLE_GATTS_VAR_ATTR_LEN_MAX (512) //&lt; Maximum length for variable length Attribute Values. Why is maximum length foren-USTelligent Community 13Tue, 29 Mar 2016 08:17:19 GMTRE: Maximum fixed-length attribute length vs Maximum variable-length attribute lengthhttps://devzone.nordicsemi.com/thread/48745?ContentTypeID=1Tue, 29 Mar 2016 08:17:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ac899e43-c3aa-494e-bf20-a7544e0c0f15Carles<blockquote> <p>Why is maximum length for fixed length attribute shorter than the one for variable length attribute? If they have to be different I was thinking a variable length would use more overhead and thus would have shorter maximum length.</p> </blockquote> <p>This is just due to the internal format of the Attribute Table and some decisions that were made when the RAM layout of it was made a while back. We use some bits in the length for other purposes and we ended up with these maximum lengths.</p> <p>Carles</p><div style="clear:both;"></div>