https://devzone.nordicsemi.com/f/nordic-q-a/27208/data-received-from-ble-unable-to-convert-from-hex-to-stringIn the on_ble_evt(ble_evt_t*) function from the ble_app_template, I added a case of &#39;BLE_GATTS_EVT_WRITE&#39;. In it has the following code: case BLE_GATTS_EVT_WRITE: { ble_gatts_evt_write_t * p_evt_write = &amp;p_ble_evt-&gt;evt.gatts_evt.params.write;en-USTelligent Community 13Mon, 13 Nov 2017 14:10:13 GMThttps://devzone.nordicsemi.com/thread/107279?ContentTypeID=1Mon, 13 Nov 2017 14:10:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:389527c7-e115-4363-9c4c-10745b59bc22Bj&#248;rn Kvaale<p>So basically you just need to concatenate a char value with a string, right? Have you taken a <a href="https://stackoverflow.com/questions/4834811/strcat-concat-a-char-onto-a-string">look at this case over on stackoverflow</a>? Regarding converting a string to a hex value, <a href="https://stackoverflow.com/questions/29547115/how-to-convert-string-to-hex-value-in-c">checkout this case</a>. Hope that helps &amp; I hope I have understood your question correctly.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/107278?ContentTypeID=1Wed, 08 Nov 2017 09:34:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:20b3e15e-687d-49c7-9ddf-5e0c6c2a4784jj<p>Since data is declared as uint8_t, it is able to receive data in int/hex/string etc format. So from the sender, it is now sending string of characters over. I just need to concatenate the string together and convert it to hex if needed.</p><div style="clear:both;"></div>