跪谢大佬,确实主题用some/topic就可以了,不用加任何前缀。我把官方文档意思理解错了,官方文档中如此描述“topic_prefix (Optional, string): The prefix used for all MQTT messages. Should not contain trailing slash. Defaults to <APP_NAME>.Use null to disable publishing or subscribing of any MQTT topic unless it is explicitly configured.”,我误解了 Defaults to <APP_NAME>的正确意思,所以才在接收消息的时候给topic前加了esp32前缀
万分感谢,万分感谢!!