My dad has a little gadget for his big green egg that monitors and adjusts the temperature by controlling a small fan at the air intake. You can check the tempe

My dad has a little gadget for his big green egg that monitors and adjusts the temperature by controlling a small fan at the air intake. You can check the temperature over WiFi either through their app or on a very basic webpage the device serves. I peeked inside once and it's definitely a basic ESP8266 module mounted to a board. It's the perfect module for this kind of application. An ESP32 would be a little bit of overkill for this kind of application unless you wanted to add a display or some other extra processing load to the hardware. A module from Nordic would also be appropriate.