Node-Red获取设备联网状态

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以下方法经本人验证通过，环境如下：

LG LA6600 电视机

Node-RED V0.20.5

node-red-node-ping 0.0.16

node-red-configurable-ping 1.0.1

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前言：我有一台LG LA6600的电视机，利用”LG Netcast TV”接入了Home Assistant，但电视状态获取并不及时。我需要实时知道电视机的开启/关闭状态，以便我在执行看电影的自动化场景时，判断是否需要自动关闭电视机

第一步： 在路由器中将 LG LA6600 （或其它需要获取联网状态的设备）设置为固定IP

第二步：Node-Red中安装模块

我测试了两个模块： ” node-red-node-ping“和”node-red-configurable-ping“，它们的应用各不相同

• node-red-node-ping ：是一个不间断ping指定ip的节点，可用于不间断判断设备联网状态 ，例如当自己的手机已联网时，便可判断为在家状态，并执行相应自动化
• node-red-configurable-ping：可在需要的时候使用该节点ping指定ip，获取设备当时那一刻的联网状况

打开Node-Red页面，点击右上角的选项图标，打开”节点管理”对话框

选择”安装”,根据你的需要，搜索并安装相应模块

安装成功后会在右侧节点列表处显示相应的节点

第三步：使用节点（以 node-red-configurable-ping 为例做简要说明）

按下图所示，拖入inject，conf ping，switch，change，debug节点，并将他们连接起来

• conf ping ：输入你要Ping的设备IP，超时等待时间以及Ping的次数
• switch ：设置两个分支，一个是”为假”，表示无法Ping通，设备不在线；一个是”除此之外”，表示设备在线

以下是导出的流程

[{"id":"213261c3.8746ee","type":"tab","label":"测试区","disabled":false,"info":""},{"id":"ed39ac61.fdbb6","type":"conf ping","z":"213261c3.8746ee","name":"Ping指定设备","host":"192.168.0.72","timeout":"3","requests":"1","x":285,"y":349,"wires":[["1944c161.cc612f"]]},{"id":"56ed78b4.3aa208","type":"inject","z":"213261c3.8746ee","name":"开始","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":120,"y":348,"wires":[["ed39ac61.fdbb6"]]},{"id":"1944c161.cc612f","type":"switch","z":"213261c3.8746ee","name":"判断是否连接","property":"payload","propertyType":"msg","rules":[{"t":"false"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":507,"y":351,"wires":[["eaf15649.9520b8"],["6075aa41.9ff694"]]},{"id":"6075aa41.9ff694","type":"change","z":"213261c3.8746ee","name":"输出设备连接","rules":[{"t":"set","p":"payload","pt":"msg","to":"设备连接","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":709,"y":388,"wires":[["d7a9277b.11b558"]]},{"id":"eaf15649.9520b8","type":"change","z":"213261c3.8746ee","name":"输出设备未连接","rules":[{"t":"set","p":"payload","pt":"msg","to":"设备未连接","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":707,"y":301,"wires":[["d7a9277b.11b558"]]},{"id":"d7a9277b.11b558","type":"debug","z":"213261c3.8746ee","name":"输出","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":901,"y":348,"wires":[]}]

最后，部署，点击开始的节点即可在调试窗口中看到结果

• 查看更多关于Node-Red自动化的文章可点击此处： https://www.feeus.com/tag/node-red/

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