An asynchronous no-std-compatible Varlink Rust crate. It consists for the following subcrates:

• zlink: A no-std crate that provides all the core API. It leaves the actual transport to other crates.
• zlink-tokio: Tranport based on Unix-domain sockets API of tokio.
• zlink-usb & zlink-micro: Together these enables RPC between a (Linux) host and microcontrollers through USB. Use the former on the host side and latter on the microcontrollers side.

Originally, zlink was also intended to be no_alloc as well but due to a series of hurdles, this idea was abandoned. For example we need to make use of the enum representations in serde but most enum representations in serde require alloc.

Still, we make every effort to minimize allocations as much as possible. In fact, we don't do any allocations in zlink itself unless std feature is enabled.

Moreover, we plan to add no_alloc in the near future.