defold / extension-websocket

A native websocket implementation for Defold

Defold websocket extension

Installation

To use this library in your Defold project, add the following URL to your game.project dependencies:

https://github.com/defold/extension-websocket/archive/master.zip

We recommend using a link to a zip file of a specific release.

API reference

https://defold.com/extension-websocket/api/

Debugging

In order to make it easier to debug this extension, we provide a game.project setting websocket.debug (edit game.project as text and add):

[websocket]
debug = level

Set it to:

• 0 to disable debugging (i.e. no debug output).
• 1 to display state changes.
• 2 to display the messages sent and received.

External resources

To verify that your websocket server works, you can test it with some tools.

• websocat

Or, you can test your server on this web page:

• https://www.websocket.org/echo.html

To monitor all the packets sent to/from the client/server, you can use e.g.

• Wireshark

For command line debugging, there's

• tcpdump: sudo tcpdump -X -s0 -ilo0 port 8080 (example for local ws:// connection)

• tcpdump: sudo tcpdump -X -s0 host echo.websocket.org (Monitors packets to/from echo.websocket.org)

Credits

This extension makes use of the C library WSlay by @tatsuhiro-t:

• https://github.com/tatsuhiro-t/wslay

The test server used by the example:

• https://www.lob.com/blog/websocket-org-is-down-here-is-an-alternative