This is a simple program for an ESP8266 to publish a temperature measured by an LM75 sensor via mqtt.
In addition, temperature, humidity, altitude and air pressure can be published, which are detected by a BME280 sensor.
This program code can be used with mec-kon's weather station.
Download the server git clone https://github.com/mec-kon/mqtt-weather_station.git
Then navigate into the server folder with cd mqtt-weather_station.
platformio init --board esp12e
pio lib install "adafruit/Adafruit BME280 Library
pio lib install "knolleary/PubSubClient"