node-red-contrib-platio 是一个基于Node-red的npm包,可以用于快速搭建物联网平台。本文将详细介绍如何使用该npm包,同时附带示例代码和指导。
安装
安装 node-red-contrib-platio
只需要在控制台中执行以下命令:
$ npm install node-red-contrib-platio
功能
node-red-contrib-platio
包含多个节点,用于实现各种功能:
- 连接适配器(Connect Adapter):用于与物联网或者其他平台进行通信。
- 设备管理器(Device Manager):可用于管理设备、传感器等物联网设备。
- 数据管理器(Data Manager):用于在平台上保存和管理数据。
- 规则引擎(Rules):用于在平台上定义规则,根据规则触发相应的操作。
- UI界面(UI):可用于建设平台上的用户界面。
使用方法
建立一个简单的物联网平台
在本示例中,我们将使用以下节点:
- 连接适配器(Connect Adapter)
- 设备管理器(Device Manager)
- 数据管理器(Data Manager)
- 规则引擎(Rules)
- 首先,打开
Node-Red
编辑器,然后拖放Connect Adapter
节点到画布中,并双击节点设置其属性(如 IP、端口、协议)。 - 然后,拖放
Device Manager
节点到画布中。在双击窗口中,您可以定义设备的不同属性,例如名称、类型、描述等。 - 接着,将
Data Manager
节点拖放到画布中,并设置属性。您可能需要为每个数据类型定义不同的标签,例如“温度”,“湿度”等。 - 最后,拖放
Rules
节点到画布上,并设置规则。您可以设置if
,then
和else
条件,例如“如果温度高于30度,则打开空调”。
代码示例
下面是使用 node-red-contrib-platio
包建立物联网平台的完整示例代码:
[{"id":"7874b2cb.7773ac","type":"ui_tab","z":"","name":"Home","icon":"dashboard","disabled":false,"hidden":false},{"id":"43f8d189.20065","type":"connect_adapter","z":"7874b2cb.7773ac","name":"Connect to MQTT","protocol":"mqtt","onnectionString":"mqtt://iot.eclipse.org:1883","x":270,"y":80,"wires":[["fc1e0d09.b7eaa"]]},{"id":"fc45bf46.c75aa8","type":"device_manager","z":"7874b2cb.7773ac","name":"Devices","x":480,"y":140,"wires":[["24b4f4e4.b4dc36"]]},{"id":"24b4f4e4.b4dc36","type":"ui_list","z":"7874b2cb.7773ac","group":"d9ac9e00.971c7","name":"Device list","order":0,"width":0,"height":0,"format":"{{item.name}} ({{item.type}})\t{{item.description}}","layout":"row-spread","x":720,"y":220,"wires":[]},{"id":"455bac81.156e28","type":"data_manager","z":"7874b2cb.7773ac","name":"Database","x":650,"y":80,"wires":[[]]},{"id":"846c9253.1a125","type":"rules","z":"7874b2cb.7773ac","name":"Temperature Rules","x":480,"y":80,"wires":[[]]},{"id":"fc1e0d09.b7eaa","type":"catch","z":"7874b2cb.7773ac","name":"","x":490,"y":200,"wires":[["846c9253.1a125"]]},{"id":"d9ac9e00.971c7","type":"ui_group","z":"","name":"Device Manager","tab":"7874b2cb.7773ac","disp":true,"width":"6","collapse":false},{"id":"f1e82446.789fd","type":"inject","z":"7874b2cb.7773ac","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":250,"y":140,"wires":[["43f8d189.20065"]]},{"id":"cd18b20d.2d3b3","type":"comment","z":"7874b2cb.7773ac","name":"IoT Platform Example","info":"","x":260,"y":40,"wires":[]}]
总结
node-red-contrib-platio
是一个强大的npm包,可用于相对简单的物联网平台的建立。它包含了多种类型的节点,可用于与各种类型的设备进行通信、管理数据、定义规则等等。此外,该包的示例代码还将所有节点组合到一起,方便给出一个完整的物联网平台搭建示例,帮助初学者更好地掌握该npm包的使用方法。
来源:JavaScript中文网 ,转载请注明来源 https://www.javascriptcn.com/post/6005634a81e8991b448e0fdd