Amazon Dash Button keeps "INITIALIZING"

I’m trying to setup Dash Button Binding and tried several ways as ducumented without success. The Thing keeps in state “Initializing”. After pressing the Dash Button this appears in the Log Viewer:

==> /var/log/openhab2/openhab.log <==

2017-12-22 22:24:09.104 [INFO ] [work.internal.dhcp.DHCPListenService] - DHCP request for unknown address:

Any hint to make the Dash Button work?

Running openhabian V1.4 with openHAB V2.2.0 stable on Raspi 3.

Have a look at the discussion here: Amazon dash button: Things won't come online, INITIALIZING