mongoose/docs/c-api/mqtt.h/mg_mqtt_next_subscribe_topic.md

title	decl_name	symbol_kind	signature
mg_mqtt_next_subscribe_topic()	mg_mqtt_next_subscribe_topic	func	int mg_mqtt_next_subscribe_topic(struct mg_mqtt_message *msg, struct mg_str *topic, uint8_t *qos, int pos);

Extract the next topic expression from a SUBSCRIBE command payload.

Topic expression name will point to a string in the payload buffer. Return the pos of the next topic expression or -1 when the list of topics is exhausted.