A Node-RED node to calculate sum.
This node is based on Eisbehr's node-red-contrib-average.
Use the "Manage palette" option inside Node-RED, or within your Node-RED user directory (typically ~/.node-red), run the command:
npm install node-red-contrib-sum
Calculate the sum of incoming msg.payload values from across a number of different msg.topic.
Incoming msg.topic has to be used to separate and identify values. Messages not containing a valid numeric value will be rejected.
Will return the current sum of all different msg.topic values as msg.payload. Every other datum will be pushed through.
The sum can be reset with an incoming message that contains msg.reset. Then all stored data will be removed and the initial sum starts at zero again.
This project is licensed under the Apache 2.0 license.