RE: Enable BLE FOTA DFU MCUBOOT in Zephyr only on button press

vasimv — Thu, 13 Nov 2025 17:18:34 GMT

mcumgr with zephyr uses BLE GATT services to communicate and update firmware You may add callback functions for GATT write/read and block reading/writing mcumgr attributes if button is not pressed.

Following code always authorizes requests, but you can return false in write_authorize/read_authorize (using bt_uuid_cmp to check if it is OTA attribute read/write or just block all GATT attributes if that's ok for you) and OTA will be blocked.

bool write_authorize (struct bt_conn *conn, const struct bt_gatt_attr *attr) {
  return true;
}

bool read_authorize (struct bt_conn *conn, const struct bt_gatt_attr *attr) {
  return true;
}

static const struct bt_gatt_authorization_cb auth_callbacks = {
  .read_authorize = read_authorize,
  .write_authorize = write_authorize,
};


...
  err = bt_gatt_authorization_cb_register(&auth_callbacks);
  if (err) {
    printk("Error at setting auth callbacks (err %d), probably already set\n", err);
  }
...

RE: Enable BLE FOTA DFU MCUBOOT in Zephyr only on button press

Amanda Hsieh — Thu, 13 Nov 2025 16:41:27 GMT

Hi,

See this post.

Regards,
Amanda H.