There is a wireless m-bus binding which you can check out New Binding: Wireless M-Bus / Techem heat cost allocators 
Based on the story from above thread you can find that Techem uses its own coding and in case of radio frames simply reports one big binary blob. Normal devices report measurements in separate fields according to european norm (heat usage, flow temperature etc)
The “security reason” argument they have is one thing, however lack of information from them how to get permitted to read such a thing is other.
For my own setup I’ve chosen different manufacturer which is aligned with standards.
I have a plan (among many others) to work on m-bus integration, however my chronic lack time is a blocker. I already have rs232/mbus master adapter and heat meter with m-bus output and hope to get it covered at some point of next year…
The bright side - depending on your technical abilities - the jmbus lib used in wm-bus binding supports also serial communication and it is compatible with m-bus as well. Thus adopting the binding should be possible.