That is the command I was using. I just tried it again (both by hitting 'execute' and by pressing the button). Neither worked. Here's a screenshot of the flic app (second picture shows the rest of the command used). I can confirm that cURL with this command does turn my receiver OFF.

https://bayimg.com/paNadaAgO
http://bayimg.com/PaNaeAagO

Are there any logs to debug or troubleshoot, what else can I try?

@robert-j-erickson Yes, we know. I am trying to delete this when I see it, but I agree that it is just way too much.
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Hello again. It turns out that this was in fact an issue introduced with iOS 13. This has now been fixed and will be released new week. Sorry for the inconvenience 😞

@md

Did you ever hear back on this?

I tried sending telnet commands to my heos in order to change input source. This works fine. We only need to have an app that can send these commands running on the flic hub.

Anyone know how to get this done?

@peh if it's in white plastic (not silicon) and has a replaceable CR2032, then it's a flic 2.

@rosner-stefan Hi! Just search for Egg clock in the app and you will find it.

@steltek the hub stores the whole configuration. You can use any phone to configure the hub. The only thing you need is the password that is written on the back side of the hub (can be changed if you want in the app).