--software and --hdrh does not work

[Toorero]

As the title suggest, if I start the trex server in stateless mode with --software and --hdrh it is not possible to collect latency information using HdrHistogram.

I need to use --software since I want to track the latency of encapsulation packets with GRE:

┌─────┐        ┌─────┐
│     │  IPv6  │     │
│     ◄────────┼     │
│ DUT │        │ TRx │
│    ─┼────────┼►    │
│     │  GRE   │     │
└─────┘        └─────┘

An example latency output would look like this:

"latency": {
    "jitter": 3,
    "average": 1741.0,
    "total_max": 3813,
    "total_min": 157,
    "last_max": 1961,
    "histogram": {
        "100": 23,
        "1000": 3105519,
        "200": 126,
        "2000": 823,
        "300": 58,
        "3000": 533,
        "400": 133,
        "500": 112,
        "600": 149,
        "700": 138,
        "800": 41,
        "900": 162
    },
    "hdrh": "HISTFAAAAB54nJNpmSzMwMDAyAABrFAawp8xrcH+A1QAAE98BCw="
}