def __send__require_ack__( self, command ): """sending a command requires an ack from the device every time.""" io.debug( 'command:\n%s' % command ) # PC sends command # meter sends ACK msg = str( self.wrap( 0, command.code ) ) return self.__retry_write_with_ack__( msg, RETRIES )
def read(self, port):
response = None
for i in xrange(self.__retries__):
io.debug( 'retry %s' % i )
port.read(0)
response = port.read( 64 )
if len(response) > 0: break;
return response
def read(self, port):
response = None
for i in xrange(self.__retries__):
io.debug('retry %s' % i)
port.read(0)
response = port.read(64)
if len(response) > 0: break
return response
def __call__( self, port ):
head = port.readline( ).strip( )
body = [ ]
for line in port.readlines( ):
try:
body.append( format_glucose( line ) )
except InvalidGlucose, e: pass
io.debug ( 'read glucose:head:%s:body.len:%s' % ( head, len(body) ) )
self.response = ( head, glucose.l2np( body ) )
return self.response
def __requireAck__( self ):
"""Try to read an ack, raising MissingAck if we don't read it. Returns
bytearray ack."""
ack = None
for i in xrange( RETRIES ):
ack = bytearray( self.read( 6 ) )
if ack == '':
io.debug( "empty ack:%s:%s:sleeping:%s" % ( i, ack, self.__pause__ ) )
time.sleep( self.__pause__ )
else:
break
io.info( 'ACK: %s' % lib.hexdump( ack ) )
if ack == '':
raise MissingAck(i)
return ack
class ReadGlucose(OneTouchCommand):
code = list(bytearray(b'DMP'))
def __call__(self, port):
head = port.readline().strip()
body = []
for line in port.readlines():
try:
body.append(format_glucose(line))
except InvalidGlucose, e:
pass
io.debug('read glucose:head:%s:body.len:%s' % (head, len(body)))
self.response = (head, glucose.l2np(body))
return self.response
