Sheldon Furst asked 3 years ago
Rui, you have some wonderful tutorials using the ASyncWebServer library. In my application I would like to force an update of the web page when the status changes (based on digitalRead) so the status is displayed correctly. You have examples of a web page automatically updating every 10 seconds (weather station) but I’d like to know how to cause an update only when I know something has changed rather than just having the page update constantly.
Thank you!
Sara Santos Staff answered 3 years ago
Hi.
You can use Server-Sent Events. The server (ESP32) sends an event to the browser with whatever you want.
So, the browser updates automatically when there is a change.
We don’t have a specific tutorial for server-sent events.
However, we use them in this project: https://randomnerdtutorials.com/esp32-bme680-web-server-arduino/
See if you can apply this concept to your own project.
Let me know if you need further help with that.
Regards,
Sara
Steph answered 3 years ago
Hey Sheldon,
Want the best of both worlds?
Take a look at my tutorial about WebSocket:
ESP32 Remote Control with WebSocket
Sheldon Furst answered 3 years ago
Thank you both. The solutions are a little more involved than I was hoping for but they are both elegant. Steph, your code is beautifully documented, even if I feel like I’m looking at the program for a 747 🙂