Openhab2, lightwaverf & rfxcom

I’m trying to get my pi to control a lightwaverf plug via rfxcom.
I know the hardware works - I’ve tested it with domiticz. For various reasons I want to use openhab as my controller.
If I click the on button on my remote I see the following in the log:
19:11:28.271 [DEBUG] [g.rfxcom.handler.RFXComBridgeHandler] - Message received: Raw data = 0A140009F3DA0101010080, Packet type = LIGHTING5, Seq number = 9, Sub type = LIGHTWAVERF, Device Id = 15981057.1, Command = ON, Dim level = 0, Signal level = 8
this agrees with the device id that paperui shows. I’ve used paperui to create a ‘thing’ for the switch with an id of 15981057.1
I’ve converted this ID to decimal (3622872191.1) to use in the item.
I’ve also added the item into the sitemap.
When I click the switch on the sitemap rfxcom shows it in the logs that it has been sent.
However, nothing happens at the plug.

I’m sure I’m missing something simple here, but I can’t see what.

I think (actually I’m quite sure) that the remark about the conversion to decimal is outdated, so the logging already contains the id in decimal. Can you check that?