old_contents: import sys
  import socket
  import time
  
  from websocket import *
  import websocket_helper
  
  
  def setup_server():
      s = socket.socket()
      s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  
      ai = socket.getaddrinfo("0.0.0.0", 8266)
      addr = ai[0][4]
  
      s.bind(addr)
      s.listen(1)
      return s
  
  def getpass(stream, prompt):
      stream.write(prompt)
      passwd = b""
      while 1:
          c = stream.read(1)
          if c in (b"\r", b"\n"):
              stream.write("\r\n")
              return passwd
          passwd += c
          stream.write("*")
  
  def handle_conn(listen_sock):
      cl, remote_addr = listen_sock.accept()
  
      print("""
  
  First-time WebREPL connection has been received. WebREPL initial setup
  will now start over this connection. During setup, UART REPL will be
  non-responsive. After setup finishes, the board will be rebooted. In
  case of error during setup, current session will continue.
  
  If you receive this message unexpectedly, it may mean that your WebREPL
  connection is being hacked (power off board if unsure).
  """)
  
      websocket_helper.server_handshake(cl)
      ws = websocket(cl)
  
      ws.write("""\
  Welcome to MicroPython WebREPL!\r
  \r
  This is the first time you connect to WebREPL, so please set a password\r
  to use for the following WebREPL sessions. Once you enter the password\r
  twice, your board will reboot with WebREPL running in active mode. On\r
  some boards, you may need to press reset button or reconnect power.\r
  \r
  """)
  
      while 1:
          passwd1 = getpass(ws, "New password: ")
          if len(passwd1) < 4:
              ws.write("Password too short\r\n")
              continue
          passwd2 = getpass(ws, "Confirm password: ")
          if passwd1 == passwd2:
              break
          ws.write("Passwords do not match\r\n")
  
      with open("port_config.py", "w") as f:
          f.write("WEBREPL_PASS = %r\n" % passwd1.decode("ascii"))
  
      ws.write("Password successfully set, restarting...\r\n")
      cl.close()
      time.sleep(2)
      import machine
      machine.reset()
  
  
  def test():
      s = setup_server()
      handle_conn(s)
  
new_contents: import sys
  import socket
  import time
  
  from websocket import *
  import websocket_helper
  
  
  def setup_server():
      s = socket.socket()
      s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  
      ai = socket.getaddrinfo("0.0.0.0", 8266)
      addr = ai[0][4]
  
      s.bind(addr)
      s.listen(1)
      return s
  
  def getpass(stream, prompt):
      stream.write(prompt)
      passwd = b""
      while 1:
          c = stream.read(1)
          if c in (b"\r", b"\n"):
              stream.write("\r\n")
              return passwd
          passwd += c
          stream.write("*")
  
  def handle_conn(listen_sock):
      cl, remote_addr = listen_sock.accept()
  
      print("""
  
  First-time WebREPL connection has been received. WebREPL initial setup
  will now start over this connection. During setup, UART REPL will be
  non-responsive. After setup finishes, the board will be rebooted. In
  case of error during setup, current session will continue.
  
  If you receive this message unexpectedly, it may mean that your WebREPL
  connection is being hacked (power off board if unsure).
  """)
  
      websocket_helper.server_handshake(cl)
      ws = websocket(cl)
  
      ws.write("""\
  Welcome to MicroPython WebREPL!\r
  \r
  This is the first time you connect to WebREPL, so please set a password\r
  to use for the following WebREPL sessions. Once you enter the password\r
  twice, your board will reboot with WebREPL running in active mode. On\r
  some boards, you may need to press reset button or reconnect power.\r
  \r
  """)
  
      while 1:
          passwd1 = getpass(ws, "New password: ")
          if len(passwd1) < 4:
              ws.write("Password too short\r\n")
              continue
          elif len(passwd1) > 9:
              ws.write("Password too long\r\n")
              continue
          passwd2 = getpass(ws, "Confirm password: ")
          if passwd1 == passwd2:
              break
          ws.write("Passwords do not match\r\n")
  
      with open("port_config.py", "w") as f:
          f.write("WEBREPL_PASS = %r\n" % passwd1.decode("ascii"))
  
      ws.write("Password successfully set, restarting...\r\n")
      cl.close()
      time.sleep(2)
      import machine
      machine.reset()
  
  
  def test():
      s = setup_server()
      handle_conn(s)
  
subject: Add max password length check.