https://devzone.nordicsemi.com/f/nordic-q-a/66753/received-data-doesn-t-match-data-sentHi, I modified the LBS service to experiment sending more than a byte of data. On the peripheral side, modified from ble_peripheral/ble_app_blinky typedef struct { uint8_t data[8]; /* 8 bytes data */ } ble_button_t; ... memset(&amp;add_char_paramsen-USTelligent Community 13Tue, 06 Oct 2020 23:14:02 GMThttps://devzone.nordicsemi.com/thread/273330?ContentTypeID=1Tue, 06 Oct 2020 23:14:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d402de6c-cc11-44c3-bb66-ce8f7496625ajshen<p>I found the bug in my application code.</p> <p>I passed address of structure in below call</p> <p><span>err_code = ble_lbs_on_button_change(m_conn_handle, &amp;m_lbs, &amp;m_button_data);</span></p> <p><span>and in that function the address of the pointer was passed to&nbsp;params.p_data, which had caused problem.</span></p> <p><span>Now both side data matches!</span></p> <p><span>Please close this issue, and sorry for the trouble.</span></p><div style="clear:both;"></div>