For the buttons I first of all wired a button to an ESP8266 device, made it connect to wifi and publish to MQTT and handled it that way. But when it came to ti

For the buttons I first of all wired a button to an ESP8266 device, made it connect to wifi and publish to MQTT and handled it that way. But when it came to time to setup a lot more of them I realized that would get expensive quickly. SO I cheated. I bought a bunch of 433Mhz-based radio-buttons: https://www.aliexpress.com/item/OWSOO-433MHz-Wireless-SOS-Button-Emergency-Button-Switch-Alarm-Accessories-For-Home-House-GSM-Security-Alarm/32828309110.html https://www.aliexpress.com/item/OWSOO-433MHz-Wireless-SOS-Bu... Then I hooked up an SDR receiver to my PC, and handle it that way. I have a 433Mhz receiver for the arduino, which could also decode those transmissions, but I never used it for anything except to prove I could. There's a pointer to the software and some overview here: https://blog.steve.fi/decoding_433mhz_transmissions_with_software_defined_radio.html https://blog.steve.fi/decoding_433mhz_transmissions_with_sof...