Update SimpleServer example to accept >1 connection

examples/wiznet5k_cpython_client_for_simpleserver.py

@@ -0,0 +1,40 @@
+# SPDX-FileCopyrightText: 2023 ladyada
+#
+# SPDX-License-Identifier: MIT
+#!/usr/bin/env python3
+
+"""
+This example client runs on CPython and connects to / sends data to the
+simpleserver example.
+"""
+import socket
+import time
+
+print("A simple client for the wiznet5k_simpleserver.py example in this directory")
+print(
+    "Run this on any device connected to the same network as the server, after "
+    "editing this script with the correct HOST & PORT\n"
+)
+# Or, use any TCP-based client that can easily send 1024 bytes. For example:
+#     python -c 'print("1234"*256)' | nc 192.168.10.1 50007
+
+
+# edit host and port to match server
+HOST = "192.168.10.1"
+PORT = 50007
+TIMEOUT = 10
+INTERVAL = 5
+MAXBUF = 1024
+
+while True:
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.settimeout(TIMEOUT)
+    print(f"Connecting to {HOST}:{PORT}")
+    s.connect((HOST, PORT))
+    # wiznet5k_simpleserver.py wants exactly 1024 bytes
+    size = s.send(b"A5" * 512)
+    print("Sent", size, "bytes")
+    buf = s.recv(MAXBUF)
+    print("Received", buf)
+    s.close()
+    time.sleep(INTERVAL)

examples/wiznet5k_simpleserver.py

@@ -18,20 +18,23 @@
 spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
 
 # Initialize ethernet interface
-eth = WIZNET5K(spi_bus, cs, is_dhcp=False)
+eth = WIZNET5K(spi_bus, cs, is_dhcp=True)
 
 # Initialize a socket for our server
 socket.set_interface(eth)
 server = socket.socket()  # Allocate socket for the server
-server_ip = "192.168.10.1"  # IP address of server
+server_ip = eth.pretty_ip(eth.ip_address)  # IP address of server
 server_port = 50007  # Port to listen on
 server.bind((server_ip, server_port))  # Bind to IP and Port
 server.listen()  # Begin listening for incoming clients
 
-conn, addr = server.accept()  # Wait for a connection from a client.
 while True:
+    print(f"Accepting connections on {server_ip}:{server_port}")
+    conn, addr = server.accept()  # Wait for a connection from a client.
+    print(f"Connection accepted from {addr}, reading exactly 1024 bytes from client")
     with conn:
         data = conn.recv(1024)
         if data:  # Wait for receiving data
             print(data)
             conn.send(data)  # Echo message back to client
+    print("Connection closed")