OpenMarine

i am usine wilhelmsk on my iPad and the signal give the value inside inverted comma.
So the value is not recognized 

How to take them out ?

Please see below :

Connection Log:
   Config: Host: 192.168.0.124 Port: 3000 REST: http http://192.168.0.124:3000/signalk/v1/api/ WS: ws://192.168.0.124:3000/signalk/v1/stream SSL: NO
   Connecting to websockets with ws://192.168.0.124:3000/signalk/v1/stream?stream=delta&subscribe=all
   Sent GET http://192.168.0.124:3000/signalk 200
   Received json: {
    endpoints =     {
        v1 =         {
            "signalk-http" = "http://192.168.0.124:3000/signalk/v1/api/";
            "signalk-tcp" = "tcp://192.168.0.124:8375";
            "signalk-ws" = "ws://192.168.0.124:3000/signalk/v1/stream";
            version = "1.16.0";
        };
    };
    server =     {
        id = "signalk-server-node";
        version = "1.16.0";
    };
}

Vessel Data:
{
  "environment" : {
    "outside" : {
      "humidity" : {
        "meta" : {
          "units" : "ratio",
          "description" : "Current outside air relative humidity"
        },
        "value" : "0.332000",
        "$source" : "OPnotifications.MQTT.humidite",
        "timestamp" : "2019-06-30T21:14:54.102Z",
        "values" : {
          "OPnotifications.MQTT.humidite" : {
            "value" : "0.332000",
            "timestamp" : "2019-06-30T21:14:54.102Z"
          }

MQTT is all text so even if the value is being sent as a number from your arduino MQTT turns it into a text string. Easier to send data signalk, it will stay as a number.