The Management Gateway Service (MGS) is the control plane service that communicates with Service Processors (SPs) running hubris.
MGS itself lives in the omicron repo, and there is a corresponding agent task in hubris with which it communicates.
gateway-messages - no_std code that defines the messages exchanged between
MGS and SPs and provides serialization/deserialization support. This is used
by the hubris task on the real SPs, by MGS proper for messaging, and by the
simulated SPs we use for testing. Sharing this crate between hubris and
omicron is the primary motivation for the existence of this repository.
gateway-sp-comms - std code used by MGS and faux-mgs for communicating
with a set of SPs.
faux-mgs - command line application intended for debug and development work;
it can pretend to be MGS to communicate with a single target SP (either
directly via IP address or discovered via UDP multicast similarily to how
MGS's general discovery process works).