filter【数据过滤】节点_物联网平台_边缘计算网关

概述

【数据过滤】节点可以设置在数据发生变化时传递数据，或者数据变化在一定范围内传递数据。根据选择的模式不同，其功能表现也不尽相同。

模式说明

• 阻塞到值变化——输入值有变化才输出
• 阻塞到值变化（忽略初始值）——输入值有变化才输出(忽略初始值)

输入

#一般情况下是数值
msg.payload
#如果设置为区分属性独立处理,会按照topic将数据分类处理
msg.topic
#如果携带该属性,则清除指定topic的缓存数据,如果未指定topic,则清所有topic的缓存数据
msg.reset

输出

#满足条件的输入值
msg.payload

示例

节点连接图示：

filter节点配置：

完整演示：

示例代码

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