def handle_read(self):
if _debug: MSTPDirector._debug("handle_read")
try:
msg, addr = self.socket.recvfrom(512)
if _debug: MSTPDirector._debug(" - received %d octets ", len(msg))
pdu = PDU(msg,destination=int(str(self.address)))
mstp_src = pdu.get()
pdu.pduSource = Address(mstp_src)
if _debug: MSTPDirector._debug("Received MSTP PDU={}".format(str(pdu)))
# send the PDU up to the client
deferred(self._response, pdu)
except socket.timeout as err:
if _debug: MSTPDirector._debug(" - socket timeout: %s", err)
except socket.error as err:
if err.args[0] == 11:
pass
else:
if _debug: MSTPDirector._debug(" - socket error: %s", err)
# pass along to a handler
self.handle_error(err)
except Exception as e:
MSTPDirector._error('Exception in handle_read: {}'.format(e))
# Add debugging into the middle of the stack
# Upstream when traveling from server to client
# Downstream when traveling from client to server
d = Debug("middle")
bind(client, d, server)
client.request('Hi')
#%% Protocol data units
from bacpypes.comm import PDU
pdu = PDU(b'hello') # Data portion of PDU only
pdu.debug_contents()
# Add source and destination information
pdu = PDU(b'hello', source=1, destination=2)
pdu.pduSource = 1
pdu.pduDestination = 2
pdu.debug_contents()
# Encoding and decoding a PDU
"""THis process consists of consuming content from a PDU (data, source, destination)
and generating content in the destination
Think if Decoding a PDU like taking characters out of an array
Encoding a PDU is like stacking characters into an array"""
pdu = PDU(b'hello!!!', source=1, destination=2)
pdu.debug_contents()
pdu.get() # 104
pdu.get_short() # 25964
pdu.get_long() # 1819222305
pdu.put_long(1819222305)