Micropython (ESP8266) websocket server implementation.
Upload all scripts and HTML page to device and execute the websocket_demo.py script.
When client connects to the device, test.html is served to him, which in turn makes websocket connection to the device and greets it with Hello. The device acknowledges this and replies with World appended, which makes client display Hello World.
New implementations can be made by subclassing WebSocketClient and WebSocketServer as shown in websocket_demo.py.
Because setsockopt can't be used on ESP32 to install event handlers, new implementation using Poll class has been made and is available in separate folder. From user perspective, both implementation behave the same. The folder contains only files that are different so don't forget to place other files from root folder on your ESP.
Also, if you're having problems importing websocket class, make sure that it's available in your firmware using following commands. websocket class should be listed in the output.
import websocket # This is importing module, not class
dir(websocket) # List everything that module supports
Micropython revision 0d5bccad is confirmed to be working correctly. Thanks for this goes to @plugowski.
It is recommended to keep the page served by server simple as the transfer speed is quite slow. Due to this, the basic implementation supports serving only one HTML page and websocket communication. However, if you really need to use multiple files (images, etc.) you can find extended implementation in Multiserver folder. You only need ws_multiserver.py file. The rest of files are for demo purposes. If you want to try it out, copy all files from the mentioned folder and run websocket_multi_demo.py. The demo page consists of 3 images and CSS file which are all served along the HTML page and websocket communication that happens after content is loaded.