Yes, this works for the Inventory API, but I can’t use the Device’s identity here, only the metadata of the device, which can change at any time. It would be enough if that format would be supported by the Device Authentication API (/api/management/v2/devauth/devices?mac=12:34:... instead of /api/management/v1/inventory/devices?mac_eth0=12:34:...), but it isn’t - the mac address obviously is a bad example as it exists both in the metadata and in the identity, but if I change the script in /usr/share/mender/identity/mender-device-identity, those values will be fully independent from each other.