import re
from CRC import do_crc
from select import select
+import socket
asynchronous_responses = [ '400', '401', # door open/closed
'610', # switches changed
s = ''
while s == '':
s = self.rfh.readline()
- if s == '': return None
+ if s == '':
+ raise VendingException('Input socket has closed!')
s = s.strip('\r\n')
code = s[0:3]
text = s[4:]