// Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/index.html");
  });
    server.on("/highcharts.js", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/highcharts.js");
  });
  server.on("/phaseA", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", readPhaseA().c_str());
  });
  server.on("/phaseB", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", readPhaseB().c_str());
  });