https://www.shelly.cloud/documents/catalogues/catalogue.pdf
https://shelly-api-docs.shelly.cloud/gen1/#shelly2-5-settings
https://faulty.cloud/blog/shelly-plug-s-pinout
https://forum.my-gekko.com/showthread.php?tid=1743
https://forum.creationx.de/forum/index.php?thread/1881-shelly-2-5-mqtt-open-und-close-befehl/
https://www.omg.de/shelly/shelly-relais-3em-wlan-messaktor/a-24126/
https://www.reichelt.de/shelly-c8853.html?&nbc=1
https://cdn-reichelt.de/documents/datenblatt/E910/SHELLY_2.5_MN_ENG.pdf
https://smartme.pl/en/shelly-2-5-as-mqtt-client-in-home-assistant/
https://www.shelly.cloud/de/products/product-overview/shi4plusws4w