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33 lines
901 B
Markdown
33 lines
901 B
Markdown
---
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title: "mg_mqtt_broker()"
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decl_name: "mg_mqtt_broker"
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symbol_kind: "func"
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signature: |
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void mg_mqtt_broker(struct mg_connection *brk, int ev, void *data);
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---
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Processes a MQTT broker message.
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The listening connection expects a pointer to an initialised
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`mg_mqtt_broker` structure in the `user_data` field.
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Basic usage:
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```c
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mg_mqtt_broker_init(&brk, NULL);
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if ((nc = mg_bind(&mgr, address, mg_mqtt_broker)) == NULL) {
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// fail;
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}
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nc->user_data = &brk;
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```
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New incoming connections will receive a `mg_mqtt_session` structure
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in the connection `user_data`. The original `user_data` will be stored
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in the `user_data` field of the session structure. This allows the user
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handler to store user data before `mg_mqtt_broker` creates the session.
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Since only the MG_EV_ACCEPT message is processed by the listening socket,
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for most events the `user_data` will thus point to a `mg_mqtt_session`.
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