def send_j1939():
bus = j1939.Bus(channel='vcan0')
node1 = j1939.Node(bus, j1939.NodeName(0), [0x01])
node2 = j1939.Node(bus, j1939.NodeName(0), [0x42])
bus.j1939_notifier.listeners.append(node1)
bus.j1939_notifier.listeners.append(node2)
pgn = j1939.PGN(reserved_flag=True,
pdu_specific=j1939.constants.DESTINATION_ADDRESS_GLOBAL)
arbitration_id = j1939.ArbitrationID(pgn=pgn, source_address=0x01)
msg = j1939.PDU(arbitration_id=arbitration_id, data=[0x10, 0x20, 0x30])
sleep(1)
node1.start_address_claim()
sleep(1)
try:
bus.send(msg)
print("Message sent on {}".format(bus.channel_info))
except can.CanError:
print("Message NOT sent")
sleep(1)
bus.flush_tx_buffer()
bus.shutdown()
def testReceivingLongMessage(self):
data = [1, 2, 3, 4, 5, 6, 7, 8]
pgn = j1939.PGN(
reserved_flag=True,
pdu_specific=j1939.constants.DESTINATION_ADDRESS_GLOBAL)
arbitration_id = j1939.ArbitrationID(pgn=pgn, source_address=0x01)
m_out = j1939.PDU(arbitration_id=arbitration_id, data=data)
otherbus = j1939.Bus(channel=can_interface)
# The otherbus might miss messages if we send them before its receive
# thread is running, so we wait here
sleep(0.50)
node = j1939.Node(otherbus, j1939.NodeName(0), [0x42, 0x01])
try:
attempts = 0
while attempts < 3:
m_in = otherbus.recv(timeout=2)
if m_in is not None:
break
# send a long message
self.bus.send(m_out)
attempts += 1
self.assertIsNotNone(m_in,
'Should receive sent messages on J1939 Bus')
self.assertIsInstance(m_in, j1939.PDU)
self.assertListEqual(m_in.data, m_out.data)
finally:
otherbus.shutdown()
def testReceivingLongMessage(self):
node = j1939.Node(self.bus, j1939.NodeName(0), [0x42, 0x01])
data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
pgn = j1939.PGN(
reserved_flag=True,
pdu_specific=j1939.constants.DESTINATION_ADDRESS_GLOBAL)
arbitration_id = j1939.ArbitrationID(pgn=pgn, source_address=0x01)
m_out = j1939.PDU(arbitration_id=arbitration_id, data=data)
otherbus = j1939.Bus(channel=can_interface)
attempts = 0
while attempts < 5:
m_in = otherbus.recv(timeout=0.5)
if m_in is not None: break
# send a long message
self.bus.send(m_out)
attempts += 1
self.assertIsNotNone(
m_in,
'Should receive messages on can bus when sending long message')
self.assertIsInstance(m_in, j1939.PDU)
self.assertListEqual(m_in.data, m_out.data)
otherbus.shutdown()