{
    "type" : "node",
    "name" : "gtpu",
    "layout" : [
        {
            "name" : "version",
            "size" : "3",
            "default" : "1",
            "readonly" : "true"
        },
        {
            "name" : "pt",
            "size" : "1"
        },
        {
            "name" : "reserved",
            "size" : "1"
        },
        {
            "name" : "e",
            "size" : "1"
        },
        {
            "name" : "s",
            "size" : "1"
        },
        {
            "name" : "pn",
            "size" : "1"
        },
        {
            "name" : "messagetype",
            "size" : "8"
        },
        {
            "name" : "messagelength",
            "size" : "16",
            "autoincrease" : "true"
        },
        {
            "name" : "teid",
            "size" : "32"
        },
        {
            "name" : "sequencenumber",
            "size" : "16",
            "optional" : "e=1|s=1|pn=1",
            "increaselength" : "true"
        },
        {
            "name" : "npdunumber",
            "size" : "8",
            "optional" : "e=1|s=1|pn=1",
            "increaselength" : "true"
        },
        {
            "name" : "nextextentionheadertype",
            "size" : "8",
            "optional" : "e=1|s=1|pn=1",
            "increaselength" : "true"
        }
    ]
}