This is a MCTP stack suitable for embedded devices.
A Router instance handles feeding MCTP packets to and from user
provided MCTP transports, and handles sending receiving MCTP messages
from applications using the mctp crate async traits.
Applications using MCTP can create RouterAsyncListener and
RouterAsyncReqChannel instances.
MCTP bridging between ports is supported by the Router.
The core Stack handles IO-less MCTP message reassembly and fragmentation,
and MCTP tag tracking. MCTP transport binding packet encoding and decoding is
provided for I2C, USB, and serial.