examples: add usb-i2c mctp app #525
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Signed-off-by: Wilfred Mallawa <wilfred.mallawa@wdc.com>
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Overview
Add a sample libtock-rs app that allows a host machine without exposed I2C/SMBus capabilities to communicate to an MCTP endpoint.
The following topology is used:
This app operates by first waiting for an MCTP request packet to be sent over UART from the host, which is then forwarded to the target endpoint (based on the target address) through the I2C bus. The endpoint must then master the I2C bus and write a response back to us, as we wait in target mode (Note: MCTP mandates writes only). This is then forwarded to the host machine via UART.
A sample use-case can be to communicate with an SPDM responder that uses MCTP/SMBus/I2C, directly from the host machine.
Host app requirements
The host app must attach a small packet header (metadata) that wraps the data message, the packet formatting is detailed in the rust-docs for the app. It must also parse the same packet upon reception of data.