Want to hack a sonoff basic? Here is how to do this and why it’s worth it!
I would suggest to re-flash all your SonOffs with Tasmota. It’s fantastic software that can do everything you want, and a lot more.
@Jeroen_Meijer I’ll give it a go next week. I looked into that and it looks very attractive 
Thanks for suggesting it regardless
You’re welcome. You probably won’t look back I have about 15 in my house, and a dual and a quad. Also a 433 MHz Sonoff Bridge. All run Tasmota, use MQTT for communications and Node-RED as automation hub.