node-red-contrib-netvar-utils
v0.5.0
Published
Network Variable List utility nodes for node-red
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node-red-contrib-netvar-utils
This module provides set of utility nodes in Node-RED for creating, parsing 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]]
]
}
Supported Data Types
- ARRAY
- STRING
- BOOL
- BYTE, WORD, DWORD
- USINT, UINT, UDINT
- SINT, INT, DINT
- ULINT, LWORD, LINT
- TIME, TOD, TIME_OF_DAY
- DT, DATE_AND_TIME, DATE
- REAL, LREAL
TODO
BigInt
- More detailed documentation for nodes
- Options to define how input is received and how output is delivered
STRUCT
- Dynamic network variable lists
- Tests
- Usage Examples
License
MIT