The Shelly app currently uses a polling mechanism to retrieve the device status. This will cause a delay. There is already a new version of this app that uses a different mechanism which should result in faster updates. But the version of this app depends on Homey firmware 5.x which is currently in the experimental channel. You will have to wait until it goes stable or try your luck with this: [APP][Pro&Cloud] Shelly - #1097 by Phuturist
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