### Uml diagram: ``` mermaid classDiagram namespace Esp { class Websockets{ +webSocket +_WiFiMulti hexdump() websocketSetup() loop() webSocketEvent() sendMyText() } class NodeReadings{ +TVOC_base, eCO2_base +counter +eCO2 +TVOC +interval +temperature +humidity +currentMillis +lastMillis +errorSGP30 +errorDHT11 +noise setup() loop() resetValues() update() checkForError() displayData() } } ```