Creating Nodes

Node-BLUE can be easily extended by creating new nodes. New nodes can be written in four programming languages:

1. C++
2. PHP
3. Python
4. JavaScript

This guide describes how to write new nodes in each of them. As the Node-BLUE frontend is based on Node-RED, this documentation is largely based on and citing the Node-RED documentation as well.

Please click on the sections you want to read:

• Creating your first node
• Node initialization and deinitialization
• JavaScript code files
• Code files of simple PHP nodes
• Code files of stateful PHP nodes
• Code files of Python nodes
• Code files of C++ nodes
• HTML file
• Packaging
• Node properties
• Node credentials
• Node appearance
• Node edit dialog
• Editor UI widgets
• Storing context
• Node status
• Configuration nodes
• Help style guilde
• Adding examples
• Internationalization

General guidance

When developing new nodes, please follow the following principles:

• Nodes should be simple to use, regardless how complex the underlying functionality is.
• When a node outputs data, the main information should always be encoded in msg.payload.
• It should never be required to use a function node in combination with nodes.
• Nodes should have a good documentation.
• Errors should always be catched, otherwise they might crash the whole process.

License

Except as otherwise provided, content on this site, including all materials posted by the ib company GmbH or Homegear GmbH, is licensed under a Creative Commons Attribution 4.0 License.