<p></p>
<p><b>@Ollrogge</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16489#discussion_r674137023">sys/fido2/ctap/transport/hid/ctap_transport_hid.c</a>:</p>
<pre style='color:#555'>> +        delay /= 2;
+    }
+#endif /* CONFIG_FIDO2_CTAP_DISABLE_LED  */
+
+    ctap_hid_write(cmd, cid, NULL, 0);
+}
+
+void fido2_ctap_transport_hid_send_keepalive(uint8_t status)
+{
+    ctap_hid_write(CTAP_HID_COMMAND_KEEPALIVE, g_ctap_buffer.cid, &status,
+                   sizeof(status));
+}
+
+static void send_error_response(uint32_t cid, uint8_t err)
+{
+    DEBUG("ctap_trans_hid err resp: %02x \n", err);
</pre>
<p>Sorry I don't quite understand ? What do you mean by is off?</p>

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