def _data_transfer_handler(self, msg):
msg_source = msg.arbitration_id.source_address
pdu_specific = msg.arbitration_id.pgn.pdu_specific
if msg_source in self._incomplete_received_pdus:
if pdu_specific in self._incomplete_received_pdus[msg_source]:
self._incomplete_received_pdus[msg_source][pdu_specific].data.extend(msg.data[1:])
total = self._incomplete_received_pdu_lengths[msg_source][pdu_specific]["total"]
if len(self._incomplete_received_pdus[msg_source][pdu_specific].data) >= total:
if pdu_specific == DESTINATION_ADDRESS_GLOBAL:
# Looks strange but makes sense - in the absence of explicit flow control,
# the last CAN packet in a long message *is* the end of message acknowledgement
return self._process_eom_ack(msg)
# Find a Node object so we can search its list of known node addresses for this node
# so we can find if we are responsible for sending the EOM ACK message
# TODO: Was self.j1939_notifier.listeners
send_ack = any(True for l in self.can_notifier.listeners
if isinstance(l, Node) and (l.address == pdu_specific or
pdu_specific in l.address_list))
if send_ack:
arbitration_id = ArbitrationID()
arbitration_id.pgn.value = PGN_TP_CONNECTION_MANAGEMENT
arbitration_id.pgn.pdu_specific = msg_source
arbitration_id.source_address = pdu_specific
total_length = self._incomplete_received_pdu_lengths[msg_source][pdu_specific]["total"]
_num_packages = self._incomplete_received_pdu_lengths[msg_source][pdu_specific]["num_packages"]
pgn = self._incomplete_received_pdus[msg_source][pdu_specific].arbitration_id.pgn
pgn_msb = ((pgn.value & 0xFF0000) >> 16)
_pgn_middle = ((pgn.value & 0x00FF00) >> 8)
_pgn_lsb = 0
div, mod = divmod(total_length, 256)
can_message = Message(arbitration_id=arbitration_id.can_id,
extended_id=True,
dlc=8,
data=[CM_MSG_TYPE_EOM_ACK,
mod, # total_length % 256,
div, # total_length / 256,
_num_packages,
0xFF,
_pgn_lsb,
_pgn_middle,
pgn_msb])
self.can_bus.send(can_message)
return self._process_eom_ack(msg)
def _data_transfer_handler(self, msg):
logger.debug("_data_transfer_handler:")
msg_source = msg.arbitration_id.source_address
pdu_specific = msg.arbitration_id.pgn.pdu_specific
if msg_source in self._incomplete_received_pdus:
logger.debug("in self._incomplete_received_pdus:")
if pdu_specific in self._incomplete_received_pdus[msg_source]:
logger.debug("in self._incomplete_received_pdus[msg_source]:")
self._incomplete_received_pdus[msg_source][
pdu_specific].data.extend(msg.data[1:])
total = self._incomplete_received_pdu_lengths[msg_source][
pdu_specific]["total"]
if len(self._incomplete_received_pdus[msg_source]
[pdu_specific].data) >= total:
logger.debug(
"allReceived: %s" %
type(self._incomplete_received_pdus[msg_source]))
logger.debug("allReceived: %s" % pprint.pformat(
self._incomplete_received_pdus[msg_source]))
logger.debug(
"allReceived: %s from 0x%x" %
(type(self._incomplete_received_pdus[msg_source]
[pdu_specific]), pdu_specific))
logger.debug("allReceived: %s" %
(self._incomplete_received_pdus[msg_source]
[pdu_specific]))
if pdu_specific == DESTINATION_ADDRESS_GLOBAL:
logger.debug(
"pdu_specific == DESTINATION_ADDRESS_GLOBAL")
# Looks strange but makes sense - in the absence of explicit flow control,
# the last CAN packet in a long message *is* the end of message acknowledgement
return self._process_eom_ack(msg)
# Find a Node object so we can search its list of known node addresses for this node
# so we can find if we are responsible for sending the EOM ACK message
# TODO: Was self.j1939_notifier.listeners
send_ack = any(
True
for (_listener, l_notifier) in self.node_queue_list
if isinstance(_listener, Node) and (
_listener.address == pdu_specific
or pdu_specific in _listener.address_list))
#send_ack = any(True for l in self.can_notifier.listeners
# if isinstance(l, Node) and (l.address == pdu_specific or
# pdu_specific in l.address_list))
if send_ack:
arbitration_id = ArbitrationID()
arbitration_id.pgn.value = PGN_TP_CONNECTION_MANAGEMENT
arbitration_id.pgn.pdu_specific = msg_source
arbitration_id.source_address = pdu_specific
arbitration_id.destination_address = 0x17
total_length = self._incomplete_received_pdu_lengths[
msg_source][pdu_specific]["total"]
_num_packages = self._incomplete_received_pdu_lengths[
msg_source][pdu_specific]["num_packages"]
pgn = self._incomplete_received_pdus[msg_source][
pdu_specific].arbitration_id.pgn
pgn_msb = ((pgn.value & 0xFF0000) >> 16)
_pgn_middle = ((pgn.value & 0x00FF00) >> 8)
_pgn_lsb = 0
logger.debug(
"in send_ack: arbitration_id=[%s], can_id=[%x], destAdder=0x%0x"
% (arbitration_id, int(arbitration_id.can_id),
arbitration_id.destination_address))
logger.debug("in send_ack: " % ())
div, mod = divmod(total_length, 256)
can_message = Message(
arbitration_id=arbitration_id.can_id,
extended_id=True,
dlc=8,
data=[
CM_MSG_TYPE_EOM_ACK,
mod, # total_length % 256,
div, # total_length / 256,
_num_packages,
0xFF,
_pgn_lsb,
_pgn_middle,
pgn_msb
])
try:
self.can_bus.send(can_message)
except CanError:
if self._ignore_can_send_error:
pass
raise
logger.debug("_data_transfer_handler: returning %s" %
(msg))
return self._process_eom_ack(msg)
