#include <ArduinoJson.h>

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  JsonDocument doc;

  doc["sensor"] = "gps";
  doc["time"] = 1351824120;
  doc["data"][0] = 48.756080;
  doc["data"][1] = 2.302038;

  serializeJson(doc, Serial);
}