Arduoino sketch for connecting a SEEED Multichannel Gas Sensor V1 to a MQTT server.
Use my forked version of their library of the library if you are using this sensor with a non AVR/SAMD board. It contains a fix for the compilation error you will get.
Change the file named settings.h with your settings.
#define WIFI_SSID "<Your WiFi SSID>"
#define WIFI_PASSWORD "<Your WiFi Password"
#define MQTT_SERVER "<Your MQTT Server address>"
#define MQTT_USER "<Your MQTT Username>"
#define MQTT_PASSWORD "<Your MQTT Password>"