ubus_notify的第三个参数是什么意思

ubus_notify的第三个参数是通知消息的内容。在给定的代码示例中，ubus_notify函数被用于广播通知消息，第三个参数是一个字符串，内容为"say Hi!"。这个参数指定了要发送的通知消息的具体内容。
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