Enum values are not serialized to strings with SignalR

[martinkonopka]

When reading data using the SignalR and GazeHub from GazeAccess plugin, validity codes are serialized as integers, not strings, even though the StringEnumConverter should be used. See below for example result in the SignalR client. Seems to be similar to this question in StackOverflow.

SignalR output:

{
  "TrackerTicks": 63689320326053870,
  "Validity": 17,
  "LeftEye": {
    "Validity": 1,
    "GazePoint2D": {
      "X": 0.200390625,
      "Y": 0.7930555555555555
    },
    "GazePoint3D": {
      "X": -155.19765625000002,
      "Y": 76.30106838676664,
      "Z": 10.912965460618338
    },
    "EyePosition3D": {
      "X": 0,
      "Y": 50,
      "Z": 634
    },
    "EyePosition3DRelative": {
      "X": 0.427537739276886,
      "Y": 0.35594475269317627,
      "Z": 0.6200730204582214
    },
    "PupilDiameter": 2.6
  },
  "RightEye": {
    "Validity": 1,
    "GazePoint2D": {
      "X": 0.200390625,
      "Y": 0.7930555555555555
    },
    "GazePoint3D": {
      "X": -155.19765625000002,
      "Y": 76.30106838676664,
      "Z": 10.912965460618338
    },
    "EyePosition3D": {
      "X": 0,
      "Y": 50,
      "Z": 634
    },
    "EyePosition3DRelative": {
      "X": 0.427537739276886,
      "Y": 0.35594475269317627,
      "Z": 0.6200730204582214
    },
    "PupilDiameter": 2.6
  },
  "Timestamp": "2019-03-27T21:52:06.0538696+01:00"
}

GET /api/gaze output:

{
  "trackerTicks": 63689321268009837,
  "validity": "Both",
  "leftEye": {
    "validity": "Valid",
    "gazePoint2D": {
      "x": 0.25703125,
      "y": 0.041666666666666664
    },
    "gazePoint3D": {
      "x": -125.8578125,
      "y": 305.06915883223218,
      "z": 94.177822470664978
    },
    "eyePosition3D": {
      "x": 0.0,
      "y": 50.0,
      "z": 634.0
    },
    "eyePosition3DRelative": {
      "x": 0.427537739276886,
      "y": 0.35594475269317627,
      "z": 0.62007302045822144
    },
    "pupilDiameter": 2.6
  },
  "rightEye": {
    "validity": "Valid",
    "gazePoint2D": {
      "x": 0.25703125,
      "y": 0.041666666666666664
    },
    "gazePoint3D": {
      "x": -125.8578125,
      "y": 305.06915883223218,
      "z": 94.177822470664978
    },
    "eyePosition3D": {
      "x": 0.0,
      "y": 50.0,
      "z": 634.0
    },
    "eyePosition3DRelative": {
      "x": 0.427537739276886,
      "y": 0.35594475269317627,
      "z": 0.62007302045822144
    },
    "pupilDiameter": 2.6
  },
  "timestamp": "2019-03-27T22:07:48.0098371"
}