MCP-C uses a pluggable transport interface so JSON-RPC messages can ride over different protocols while the core logic stays identical.

Available Transports

Transport	Status	Platform Support	Use Case
HTTP	Implemented	Linux, Zephyr	Standard MCP, web compatibility
MQTT	Planned	Linux, Zephyr, ESP32	IoT, publish/subscribe scenarios

Transport Interface

All transports implement the same minimal interface defined in include/mcp_transport.h:

typedef struct mcp_transport {
    const char *name;
    int (*init)(struct mcp_server *srv, void *cfg);
    int (*poll)(struct mcp_server *srv);
    int (*send)(struct mcp_session *s, const uint8_t *data, size_t len);
    void (*close)(struct mcp_server *srv);
} mcp_transport_t;

poll() is called by the server loop. If a transport gets data via off-thread callbacks, enqueue buffers and drain them in poll() before calling mcp_server_dispatch().

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Table of contents

• HTTP Transport