SignalK updates over WiFi from ESP32

[KKempeneers]

Sorry i could not answer sooner ... upon tkurki's suggestion i dove in the server logs and found that the Signal K message was improper formated.  

For future reference, the C++ (Arduino code) should be:

String makeSignalKDelta(const char* topic, float data) {
  String SignalKDelta;
  DynamicJsonDocument doc(256);

  // Create the Signal K Delta message
  JsonArray updatesArray = doc.createNestedArray("updates");
  // Create an object within the updates array
  JsonObject updateObject = updatesArray.createNestedObject();
  // Create the values array within the update object
  JsonArray valuesArray = updateObject.createNestedArray("values");
  // Create an object within the values array
  JsonObject value = valuesArray.createNestedObject();
 
  value["path"] = topic;
  value["value"] = data;  
 
  serializeJson(doc, SignalKDelta);
  return SignalKDelta;
}

(You must include ArduinoJson.h in order to compile) With that sorted out ... how can i read data from the SignalK server? And are there aftermarket displays that withstand the weather and understand SignalK? Which one would you suggest? I realy would like the dept sounder and wind instrument on a display in the cockpit. 
 to server: 10.10.10.1

95 bytes written.

{"updates":[{"values":[{"path":"vessels.self.propulsion.0.revolutions","value":38.483}