Connection error in SPDM_EMU when using SPDM over MCTP about spdm-emu

[alistair23]

Another option is to use SPDM-Utils. Like spdm-emu it uses libspdm but is aimed at testing real devices instead of emulators.

SPDM-Utils can currently communicate with a SPDM device over PCIe DOE. We don't yet have MCTP support, but we are working on it. It should be pretty easy for you to extend SPDM-Utils to support MCTP as well

[jyao1]

spdm-emu is just an emulation program running on Windows/Linux OS environment with TCP/IP.

If you want to use it MCTP, then it is NOT an emulation. It is a real platform environment.
You need to write your own device layer function to send/receive function.

See https://github.com/DMTF/libspdm/blob/main/doc/user_guide.md#spdm-responder

0.5, implement required SPDM device IO functions - libspdm_device_send_message_func and libspdm_device_receive_message_func according to spdm_common_lib.

[admiyo]

If I run --trans MCTP it still does everything as tcp/ip.

MCTP supports a socket layer, so instead of listening on tcp, it should listen on an MCTP socket, like the echo listener here:

https://github.com/CodeConstruct/mctp/blob/main/src/mctp-echo.c

But all the socket calls are TCP/IP.

Is this a change in how it was intended to be used?