nodemcu-dht22

Hardware Setup:

• NodeMCU V3 - Link: NodeMCU V3

• DHT22 Sensor AM2302 - Link: DHT22 Sensor

  This Sensor no need 1KOhm Resistor because is already installed on board

Software Setup:

• https://www.arduino.cc/en/main/software
• https://github.com/adafruit/DHT-sensor-library
• https://github.com/knolleary/pubsubclient

Settings:

char* topic = "dht22";
char* server = "148.251.206.53";
char* hellotopic = "hello_topic";

You can change this setting in the Arduino Sketch with your parameters of MQTT-Server and Topic.

Have a look at this Article to find out your proper MQTT-Server Public MQTT-Server List