mosquitto mqtt will消息命令示例

下面是一个Will Message的示例：

Sub端clientid=sub预定义遗嘱消息:

mosquitto_sub --will-topic test --will-payload offline --will-qos 2 -t topic -i sub -h 192.168.1.1

客户端 clientid=alive 在 192.168.1.1　订阅will主题

mosquitto_sub -t test -i alive -q 2 -h 192.168.1.1

当断开client sub端与Server端连接，alive收到offline的消息。

参数说明：

--will-payload : payload for the client Will, which is sent by the broker in case of
                  unexpected disconnection. If not given and will-topic is set, a zero
                  length message will be sent.
 --will-qos : QoS level for the client Will.
 --will-retain : if given, make the client Will retained.
 --will-topic : the topic on which to publish the client Will.

-t : mqtt topic to subscribe to. May be repeated multiple times.
-i : id to use for this client. Defaults to mosquitto_sub_ appended with the process id.
-h : mqtt host to connect to. Defaults to localhost.

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