Welcome to the forum!
Would recommend to use a Shelly plus 1 instead - and the issue is gone!
Hallo,
thank you for your reply.
To understand it correctly: with the shelly plus the timer will go into an endless loop of turning off and on?
Edit: for anyone interested in solving this with a shelly 1: you can use the REST Api. Use this documentation: https://shelly-api-docs.shelly.cloud/cloud-control-api/
Be beware of a caveeat: the documentation is not clear about how to put the parameters. You can use the "id" and "auth_key" as part of the POST url, like this:
https://shelly-48-eu.shelly.cloud/device/relay/control?id=123123123&auth_key=13123123123123123
But the information "channel" and "turn" need to be form data in the body, like this, using postman:
(okay i can not post screenshots, nevermind).