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.
@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).
That means the button is not connected to the device. Does the Flic light up when you press it with fade in-out? That means it's advertising and waiting for someone to connect. If that happens and you want to connect it to the phone, the phone's Bluetooth might have hung, so please reboot it.