This tutorial shows how to broadcast TCP data to WebSocket clients. Netcat is used as a dummy TCP backend server.
To run this you must have installed docker and have added a host file entry for kaazing.example.com, as described here
The docker-compose.yml describes two containers it will run: the gateway and netcat. These will be launched in the following configuration
The gateway container will run a broadcast service that allows WebSocket clients to connect on the front end. When a tcp message is sent from netcat, the gateway will forward that message to all other connected clients. The gateway config file is configured as follows
<service>
<name>Netcat Broadcast</name>
<description>
A service that broadcast from TCP to WebSocket by
connecting to a TCP Backend listening on tcp://netcat:1000
and accepting WebSocket connections on ws://kaazing.example.com:8000/
</description>
<accept>ws://kaazing.example.com:8000/</accept>
<connect>tcp://netcat:1000</connect>
<type>broadcast</type>
<!-- Restrict cross site constraints before running in production -->
<cross-site-constraint>
<!--
* is not secure for production javascript applications and allows
access from all origins. See https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
-->
<allow-origin>*</allow-origin>
</cross-site-constraint>
</service>- Start the containers
docker-compose up -d-
Connect to the gateway in a web browser via http://websocket.org/echo.html?location=ws://kaazing.example.com:8000/
-
Push data through netcat by running
docker-compose exec netcat nc -l 1000and typing any message you want to send