asyncio doc: add TCP echo client/server using streams

Doc/library/asyncio-protocol.rst

@@ -439,10 +439,13 @@ coroutine can be used to wait until the write buffer is flushed.
 Protocol examples
 =================
 
-TCP echo client
----------------
+.. _asyncio-tcp-echo-client-protocol:
 
-TCP echo client example, send data and wait until the connection is closed::
+TCP echo client protocol
+------------------------
+
+TCP echo client  using the :meth:`BaseEventLoop.create_connection` method, send
+data and wait until the connection is closed::
 
     import asyncio
 
@@ -478,11 +481,19 @@ having to write a short coroutine to handle the exception and stop the
 running loop. At :meth:`~BaseEventLoop.run_until_complete` exit, the loop is
 no longer running, so there is no need to stop the loop in case of an error.
 
+.. seealso::
+
+   The :ref:`TCP echo client using streams <asyncio-tcp-echo-client-streams>`
+   example uses the :func:`asyncio.open_connection` function.
+
 
-TCP echo server
----------------
+.. _asyncio-tcp-echo-server-protocol:
 
-TCP echo server example, send back received data and close the connection::
+TCP echo server protocol
+------------------------
+
+TCP echo server using the :meth:`BaseEventLoop.create_server` method, send back
+received data and close the connection::
 
     import asyncio
 
@@ -507,12 +518,12 @@ TCP echo server example, send back received data and close the connection::
     coro = loop.create_server(EchoServerClientProtocol, '127.0.0.1', 8888)
     server = loop.run_until_complete(coro)
 
-    # Server requests until CTRL+c is pressed
+    # Serve requests until CTRL+c is pressed
     print('Serving on {}'.format(server.sockets[0].getsockname()))
     try:
         loop.run_forever()
     except KeyboardInterrupt:
-        print("exit")
+        pass
 
     # Close the server
     server.close()
@@ -524,6 +535,11 @@ TCP echo server example, send back received data and close the connection::
 methods are asynchronous. ``yield from`` is not needed because these transport
 methods are not coroutines.
 
+.. seealso::
+
+   The :ref:`TCP echo server using streams <asyncio-tcp-echo-server-streams>`
+   example uses the :func:`asyncio.start_server` function.
+
 
 .. _asyncio-udp-echo-client-protocol:
 

Doc/library/asyncio-stream.rst

@@ -241,6 +241,84 @@ IncompleteReadError
 Stream examples
 ===============
 
+.. _asyncio-tcp-echo-client-streams:
+
+TCP echo client using streams
+-----------------------------
+
+TCP echo client using the :func:`asyncio.open_connection` function::
+
+    import asyncio
+
+    def tcp_echo_client(message, loop):
+        reader, writer = yield from asyncio.open_connection('127.0.0.1', 8888,
+                                                            loop=loop)
+
+        print('Send: %r' % message)
+        writer.write(message.encode())
+
+        data = yield from reader.read(100)
+        print('Received: %r' % data.decode())
+
+        print('Close the socket')
+        writer.close()
+
+    message = 'Hello World!'
+    loop = asyncio.get_event_loop()
+    loop.run_until_complete(tcp_echo_client(message, loop))
+    loop.close()
+
+.. seealso::
+
+   The :ref:`TCP echo client protocol <asyncio-tcp-echo-client-protocol>`
+   example uses the :meth:`BaseEventLoop.create_connection` method.
+
+
+.. _asyncio-tcp-echo-server-streams:
+
+TCP echo server using streams
+-----------------------------
+
+TCP echo server using the :func:`asyncio.start_server` function::
+
+    import asyncio
+
+    @asyncio.coroutine
+    def handle_echo(reader, writer):
+        data = yield from reader.read(100)
+        message = data.decode()
+        addr = writer.get_extra_info('peername')
+        print("Received %r from %r" % (message, addr))
+
+        print("Send: %r" % message)
+        writer.write(data)
+        yield from writer.drain()
+
+        print("Close the client socket")
+        writer.close()
+
+    loop = asyncio.get_event_loop()
+    coro = asyncio.start_server(handle_echo, '127.0.0.1', 8888, loop=loop)
+    server = loop.run_until_complete(coro)
+
+    # Serve requests until CTRL+c is pressed
+    print('Serving on {}'.format(server.sockets[0].getsockname()))
+    try:
+        loop.run_forever()
+    except KeyboardInterrupt:
+        pass
+
+    # Close the server
+    server.close()
+    loop.run_until_complete(server.wait_closed())
+    loop.close()
+
+.. seealso::
+
+   The :ref:`TCP echo server protocol <asyncio-tcp-echo-server-protocol>`
+   example uses the :meth:`BaseEventLoop.create_server` method.
+
+
 Get HTTP headers
 ----------------