I have just created [rest] Add webhook-like endpoint for sending command to Item by florian-h05 · Pull Request #4760 · openhab/openhab-core · GitHub that allows to send a command to an Item by sending HTTP GET to
http://localhost:8080/rest/items/{itemname}/command?value={cmd}
Wow, that’s amazing progress!!
Do you think it is possible to run the app on vivoactive 3? (I have one …)