new_contents: from pwn import *
  
  # Vortex Level 0 -> Level 1
  #
  # Level Goal
  #
  # Your goal is to connect to port 5842 on vortex.labs.overthewire.org and read
  # in 4 unsigned integers in host byte order. Add these integers together and
  # send back the results to get a username and password for vortex1.
  #
  # This information can be used to log in using SSH.
  #
  # Note: vortex is on an 32bit x86 machine (meaning, a little endian architecture)
  
  io = remote('vortex.labs.overthewire.org', 5842)
  
  # You can receive data manually.  We want exactly four bytes.
  data = io.recvn(4)
  
  # Now let's unpack them as a 32-bit little-endian integer
  value = unpack(data, bits=32, endian='little')
  
  # By default, pwntools sets everything to i386, which is 32-bit little endian.
  # Because of this, there is no need to specify the extra arguments.
  #
  # The above line could instead just read:
  value = unpack(data)
  
  # There's also a helper available directly on the tube itself
  # Let's read the other integers
  value += io.unpack()
  value += io.unpack()
  value += io.unpack()
  
  # Now let's send it back
  io.pack(value)
  
  # Receive all data until the connection closes
  log.info(io.recvall())
subject: Add network example