Node-red-contrib-netvar-utils NPM

node-red-contrib-netvar-utils

This module provides set of utility nodes in Node-RED for creating, parsing and reading NVL (Network Variable List) UDP packets. Supports NVL of any size.

Created using @alexk111's node-red template

Nodes

`nvl-json`

Outputs JSON object with falsy values based on the configured NVL.

`nvl-reader`

Parses received NVL packets and returns the entire NVL as JSON object. Can be configured to emit message on each received packet or only when last expected packet is received. Currently nvl-reader will silently omit invalid packets.

`nvl-emitter`

Outputs NVL packet(s) using given JSON object. Input JSON object must have the same structure as the ones outputed via nvl-json and nvl-reader.

`nvl-header`

Outputs header details of NVL packet.

Example

JSON Structure

VAR_GLOBAL
  flag: BOOL;
  counter: WORD;
  message: STRING(50);
  wordArray: ARRAY [1..5] OF WORD;
  timeMatrix: ARRAY [1..2] OF ARRAY [1..3] OF WORD;
  threeD: ARRAY [0..1, 0..1, 0..1] OF WORD;
END_VAR

will be converted to:

{
  "flag": false,
  "counter": 0,
  "message": "",
  "wordArray": [0,0,0,0,0],
  "timeMatrix": [
    [0,0,0],
    [0,0,0]
  ],
  "threeD": [
    [[0,0], [0,0]],
    [[0,0], [0,0]]
  ]
}