MPU-9250 and BME280 to OpenPlotter

[PaddyB]

Is there someone with experience with this? I think a good tutorial about generating code for SignalK data could benefit a lot.

You could try this :-
At the top paste this line >

Code:

#include "ArduinoJson.h"

then 

Code:

void sendSigK(String sigKey, float data)
{

   DynamicJsonBuffer jsonBuffer;
   String deltaText;

   //  build delta message
   JsonObject &delta = jsonBuffer.createObject();

   //updated array
   JsonArray &updatesArr = delta.createNestedArray("updates");
   JsonObject &thisUpdate = updatesArr.createNestedObject();   //Json Object nested inside delta [...
   JsonArray &values = thisUpdate.createNestedArray("values"); // Values array nested in delta[ values....
   JsonObject &thisValue = values.createNestedObject();
   thisValue["path"] = sigKey;
   thisValue["value"] = data;

   thisUpdate["Source"] = "ESP32";

   delta.printTo(Serial);
   Serial.println();
 
}

 Cut and paste above void loop() then in the main loop below 

'temp = pressure.readTemperature();

  press = pressure.readPressure();'

paste >

Code:

sendSigK("environment.outside.pressure", press);
sendSigK("environment.outside.temperature", temp );

Untested but might work first time, maybe....