Subscribe to all the messages with mosquitto or open your MQTT client software:
sudo mosquitto_sub -t +/# -v
The value is between 0 and 1024 and is tranmitted via Mqtt when it changes.
You will receive every TimeBetweenReadingDHT (set into config_DHT.h) the DHT measurement (30s per default).
If you want to don't resend value when it is the same you can set dht_always = false in config_DHT.h
You will receive the HTU21 sensor readings every TimeBetweenReadinghtu21 (set into config_HTU21.h) (30s by default).
If you don't want to resend values that haven't changed you can set htu21_always = false in config_HTU21.h
You will receive the DS18x20 sensor readings every DS1820_INTERVAL_SEC (set into config_DS1820.h) (60s by default). Each sensor will be published under the following topic using each sensors' address.
The units for temperature readings are sent in Celcius by default can be changed to ferenheight by setting DS1820_FAHRENHEIT = true in in config_DS1820.h
If you don't want to resend values that haven't changed you can set DS1820_ALWAYS = false in config_DS1820.h