<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_r674168497">sys/fido2/ctap/ctap_utils.c</a>:</p>
<pre style='color:#555'>> +#include "debug.h"
+
+static bool g_user_present = false;
+
+#if !IS_ACTIVE(CONFIG_FIDO2_CTAP_DISABLE_UP)
+static void gpio_cb(void *arg);
+
+int fido2_ctap_utils_user_presence_test(void)
+{
+#ifdef BTN0_PIN
+    int ret;
+#ifdef MODULE_FIDO2_CTAP_HID
+    fido2_ctap_transport_hid_send_keepalive(CTAP_HID_STATUS_UPNEEDED);
+#endif
+
+    if (gpio_init_int(BTN0_PIN, BTN0_MODE, GPIO_FALLING, gpio_cb, NULL) < 0) {
</pre>
<p>The keepalive packet is actually not needed. This is a misunderstanding on my side. Thanks !</p>

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