https://devzone.nordicsemi.com/f/nordic-q-a/68748/help-with-reading-write-attribute-value-in-bleHello, I have been working with BLE on the nRF52840 with softdevice 140 and the latest in terms of SDK. The problem I have run into is with reading the value that has been written to by the client. I&#39;m using the peripheral heart rate example asen-USTelligent Community 13Wed, 25 Nov 2020 06:04:43 GMThttps://devzone.nordicsemi.com/thread/281696?ContentTypeID=1Wed, 25 Nov 2020 06:04:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2e1d3648-682d-4aff-80d6-74b11bd3a0c2sethu<p>Nevermind, I got it. Just had to change the call back to this:</p> <p><pre class="ui-code" data-mode="text">static ssize_t write_on(struct bt_conn *conn, const struct bt_gatt_attr *attr, const void *buf, uint16_t len, uint16_t offset, uint8_t flags) { uint8_t val; printk(&quot;[MY] Value -- %x \n&quot;, *(uint8_t *)(buf)); return 1; }</pre></p> <div> <div><span></span></div> </div><div style="clear:both;"></div>