Add MCTP over USB embassy device

This provides a MCTP over USB device sending/receiving MCTP packets. It
also provides run() to integrate it with a mctp_estack::Router.

This is not part of the workspace because of conflicts between
serde std feature and ssmarshall, pulled in by embassy-usb.
https://gitlab.com/robigalia/ssmarshal/-/issues/5

Signed-off-by: Matt Johnston <[email protected]>

Author: mkj

Cargo.toml

@@ -1,5 +1,6 @@
 [workspace]
-members = [ "mctp", "mctp-linux", "mctp-estack", "pldm", "pldm-fw", "pldm-fw-cli", "standalone"]
+members = [ "pldm-fw-cli", "standalone" ]
+exclude = [ "mctp-usb-embassy" ]
 resolver = "2"
 
 [workspace.dependencies]

ci/runtests.sh

@@ -33,6 +33,14 @@ cargo build --target thumbv7em-none-eabihf --features defmt --no-default-feature
 cargo build --features log
 )
 
+# not a workspace
+(
+cd mctp-usb-embassy
+cargo build --target thumbv7em-none-eabihf --features defmt --no-default-features
+cargo build --features log
+cargo doc
+)
+
 cargo doc --features mctp-estack/log
 
 echo success