#include <ArduinoJson.h>
  JsonDocument doc;
void setup ( void ) {

  Serial.begin(115200);
  
}

void loop ( void ) {
  
  deserializar ( get_data ( ) );
  delay(10); 
}

String get_data ( void ) {

    if ( Serial.available ( ) > 0 )
      return Serial.readString ( );
    else 
      return " ";
}

void deserializar ( String msg ) {

  DeserializationError error = deserializeJson ( doc, msg );
  if (error);
  else {
    String sensor = doc["sensor"];
    long time          = doc["time"];
    double latitude    = doc["data"][0];
    double longitude   = doc["data"][1];
    serializar ( sensor, time, latitude, longitude);
  }
  
}

void serializar ( String sensor, long time, double latitude, double longitude){

  JsonDocument doc2;

  doc2["sensor"] = sensor;
  doc2["time"] = time;
  doc2["data"][0] = latitude;
  doc2["data"][1] = longitude;
  serializeJsonPretty (doc2, Serial);

}