update all websocket examples to v4

websockets/chat-tcp/README.md

@@ -0,0 +1,32 @@
+# Websocket chat example
+
+This is extension of the
+[actix chat example](https://github.com/actix/actix/tree/master/examples/chat)
+
+Added features:
+
+* Browser WebSocket client
+* Chat server runs in separate thread
+* Tcp listener runs in separate thread
+
+## Server
+
+Chat server listens for incoming tcp connections. Server can access several types of message:
+
+* `/list` - list all available rooms
+* `/join name` - join room, if room does not exist, create new one
+* `/name name` - set session name
+* `some message` - just string, send message to all peers in same room
+* client has to send heartbeat `Ping` messages, if server does not receive a heartbeat message for 10 seconds connection gets dropped
+
+To start server use command: `cargo run --bin websocket-tcp-server`
+
+## Client
+
+Client connects to server. Reads input from stdin and sends to server.
+
+To run client use command: `cargo run --bin websocket-tcp-client`
+
+## WebSocket Browser Client
+
+Open url: [http://localhost:8080/](http://localhost:8080/)