Any LWM2M implementation on Server Side?

Rust is a natural choice for writing machine-to-machine code.
:thinking: Leshan is a Java implementation of LWM2M(Light weight machine-to-machine) protocol, it's well capsuled and easy to use.
When come to Rust, I have found some CoAP implementations.
It's there any LWM2M impl?
Or any in progress projects I could get in? Server side or client side?
(...not much hope)