Most OTA schemes just allow you to push an update to your ESP8266, but Xose Pérez’s latest offering, “NoFUSS”, is a plug-in for your ESP8266 project which enables your ESP8266 to regularly check in with a specified server and automatically download an update if there’s one available. Neat!
In addition to the simple update functionality, NoFuss allows you to configure whether updates will be offered to specific groups of ESPs (for instance, temperature sensors which might all use the BME280 module) and to configure a specific load sequence (so that the SPIFFS filesystem on the target ESP might be updated before the actual project firmware).
The requirements for implementing this on your home network are fairly simple. The server side requires a web-server capable of supporting PHP. The ESP side requires that you add Xose’s NoFUSSClient library to your ESP project. The configuration for both sides is explained in Xose’s original article and the git repository for the project is available here.