{
    "cron_expr": "",
    "action": "stream|upgrade",
    "execute_only_once": "true|false",
    "name": "",
    "broadcastgroup_id": "",
    "stream_type": "media|sample",
    "upgrade_targets": [{
        "mac":"^([0-9A-Fa-f]{2}:){5}([0-9A-Fa-f]{2})$"
    }],
    "mediafile_id": "",
    "sample_filename": "",
    "additional_sounds_enabled": "true|false"
}