Shelly 1 is a miniature WiFi switch with firmware for control within the Apple HomeKit, which, thanks to its size, can easily be installed under a switch or socket in a deeper enclosure.
Installing HomeKit firmware on Shelly1
Shelly 1 for Apple HomeKit
Shelly 1 Plus - WiFi/BT Module
Adding Shelly to HomeKit to make a dumb switch smart
Shelly 1 for Apple HomeKit
Shelly-Module zu HomeKit hinzufügen: So einfach geht es mittlerweile
SHELLY PLUS 1, Wifi Smart Switch, Home Assistant, Relay Control
Shelly Plus 1PM, Smart Home Assistant WiFi BLE Relay Automation Switch
Shelly Plus 1 Mini Wi-Fi-operated smart switch, 1 channel 8
Intercom Buzzer wiring with Shelly Plus 1
Shelly Plus 1 Mini switch - WiFi/BT module
SHELLY HomeKit Support (Open Source) - Blog