Cisco Cisco This document specifies the messaging functionality for MOCHA (MoQ Open Communication & Hosting Architecture). It defines how participants send and receive messages in channels using MoQ Transport (MOQT) publish/subscribe primitives. Each device publishes messages on its own track within a channel namespace, enabling decentralized message production with relay-based fan-out. This specification covers message naming, format, causal ordering, delivery, roster management, and channel discovery for text-based chat.