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example_message_interface.py
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example_message_interface.py
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'''
Demo of access to and from the message layer, i.e. down through the link layer
This is an interface in terms of OpenLCB messages.
Usage:
python3 example_message_interface.py [host|host:port]
Options:
host|host:port (optional) Set the address (or using a colon,
the address and port). Defaults to a hard-coded test
address and port.
'''
from openlcb.canbus.tcpsocket import TcpSocket
from openlcb.canbus.canphysicallayergridconnect import (
CanPhysicalLayerGridConnect,
)
from openlcb.canbus.canlink import CanLink
from openlcb.nodeid import NodeID
from openlcb.message import Message
from openlcb.mti import MTI
# specify connection information
# region replaced by settings
# host = "192.168.16.212"
# port = 12021
# localNodeID = "05.01.01.01.03.01"
# endregion replaced by settings
# region same code as other examples
from examples_settings import Settings
settings = Settings()
if __name__ == "__main__":
settings.load_cli_args(docstring=__doc__)
# endregion same code as other examples
s = TcpSocket()
# s.settimeout(30)
s.connect(settings['host'], settings['port'])
print("RR, SR are raw socket interface receive and send; RL,"
" SL are link interface; RM, SM are message interface")
def sendToSocket(string):
print(" SR: {}".format(string.strip()))
s.send(string)
def printFrame(frame):
print(" RL: {}".format(frame))
canPhysicalLayerGridConnect = CanPhysicalLayerGridConnect(sendToSocket)
canPhysicalLayerGridConnect.registerFrameReceivedListener(printFrame)
def printMessage(msg):
print("RM: {} from {}".format(msg, msg.source))
canLink = CanLink(NodeID(settings['localNodeID']))
canLink.linkPhysicalLayer(canPhysicalLayerGridConnect)
canLink.registerMessageReceivedListener(printMessage)
#######################
# have the socket layer report up to bring the link layer up and get an alias
print(" SL : link up")
canPhysicalLayerGridConnect.physicalLayerUp()
# send an VerifyNodes message to provoke response
message = Message(MTI.Verify_NodeID_Number_Global,
NodeID(settings['localNodeID']), None)
print("SM: {}".format(message))
canLink.sendMessage(message)
# process resulting activity
while True:
received = s.receive()
print(" RR: {}".format(received.strip()))
# pass to link processor
canPhysicalLayerGridConnect.receiveString(received)