[maas-19] dimitern@hitchcock:~$ maas hw-root devices create parent=4y3h7p mac_addresses=aa:bb:cc:dd:ee:f0
Success.
Machine-readable output follows:
{
    "node_type_name": "Device",
    "address_ttl": null,
    "owner": "root",
    "hostname": "deprivative-guillermina",
    "system_id": "4y3h8s",
    "ip_addresses": [],
    "tag_names": [],
    "interface_set": [
        {
            "parents": [],
            "vlan": {
                "vid": 0,
                "primary_rack": null,
                "secondary_rack": null,
                "fabric": "maas-external",
                "id": 0,
                "resource_uri": "/MAAS/api/2.0/vlans/0/",
                "mtu": 1500,
                "dhcp_on": false,
                "name": "untagged",
                "external_dhcp": null
            },
            "id": 92,
            "discovered": null,
            "params": "",
            "children": [],
            "type": "physical",
            "resource_uri": "/MAAS/api/2.0/nodes/4y3h8s/interfaces/92/",
            "tags": [],
            "enabled": true,
            "effective_mtu": 1500,
            "links": [],
            "name": "eth0",
            "mac_address": "aa:bb:cc:dd:ee:f0"
        }
    ],
    "domain": {
        "resource_record_count": 0,
        "id": 0,
        "ttl": null,
        "resource_uri": "/MAAS/api/2.0/domains/0/",
        "authoritative": true,
        "name": "maas"
    },
    "resource_uri": "/MAAS/api/2.0/devices/4y3h8s/",
    "zone": {
        "resource_uri": "/MAAS/api/2.0/zones/default/",
        "name": "default",
        "description": ""
    },
    "fqdn": "deprivative-guillermina.maas",
    "node_type": 1,
    "owner_data": {},
    "parent": "4y3h7p"
}