ha_mqtt_sensor_dht22.ino ArduinoJson 5 to ArduinoJson 6 upgrade

[micgoebe]

compiling ha_mqtt_sensor_dht22.ino lately gives an error saying the code needs to be migrated from ArduinoJson 5 to ArduinoJson 6.

the following link to a website is given, and i could solve the topic by watching just the video at second example given, see https://arduinojson.org/v6/doc/upgrade/
In short:

• change 'StaticJsonBuffer' to 'StaticJsonDocument' to become > StaticJsonDocument<200> doc;
• remove line > JsonObject& root = jsonBuffer.createObject();
• replace the 'root' object with 'doc' subsequently
• replace root.prettyPrintTo(Serial); with serializeJsonPretty(doc, Serial);
• replace root.printTo(data, root.measureLength() + 1); with serializeJson(doc, data);
  (this latest line i don't understand why the measureLenght paramter can be omitted, but seems to work)