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playground for sockets and EXI
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uhi22
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75
demo_V2GTP.py
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75
demo_V2GTP.py
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# EXI is specified in w3.org/TR/exi
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# To decode and encode, we can use this Decoder/Encoder: https://github.com/FlUxIuS/V2Gdecoder
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#
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# https://github.com/FlUxIuS/V2Gdecoder/releases
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# Install java from https://www.java.com/de/download/manual.jsp
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#
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# C:\>java -version
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# java version "1.8.0_351"
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# Java(TM) SE Runtime Environment (build 1.8.0_351-b10)
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# Java HotSpot(TM) Client VM (build 25.351-b10, mixed mode, sharing)
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# C:\>
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#
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# In wireshark: Copy as hex stream
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# 01fe8001000000228000dbab9371d3234b71d1b981899189d191818991d26b9b3a232b30020000040040
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# remove the 8 bytes V2GTP header
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# 8000dbab9371d3234b71d1b981899189d191818991d26b9b3a232b30020000040040
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#
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# java -jar V2Gdecoder.jar -e -s 8000dbab9371d3234b71d1b981899189d191818991d26b9b3a232b30020000040040
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# ERROR: 'Premature EOS found while reading data.'
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# <?xml version="1.0" encoding="UTF-8"?><ns4:supportedAppProtocolReq xmlns:ns4="urn:iso:15118:2:2010:AppProtocol"
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# xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns3="http://www.w3.org/2001/XMLSchema">
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# <AppProtocol>
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# <ProtocolNamespace>urn:din:70121:2012:MsgDef</ProtocolNamespace>
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# <VersionNumberMajor>2</VersionNumberMajor>
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# <VersionNumberMinor>0</VersionNumberMinor>
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# <SchemaID>1</SchemaID>
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# <Priority>1</Priority>
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# </AppProtocol>
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# </ns4:supportedAppProtocolReq>
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#
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#
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#
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#
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from helpers import showAsHex
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# Example: This is the first message from the EVCC.
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# Means: It is an supportedAppProtocolReq message. It provides a list of charging protocols supported by the EVCC.
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#
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#
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v2gframe = [
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0x01, 0xfe,
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0x80, 0x01,
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0x00, 0x00, 0x00, 0x22,
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0x80, 0x00, 0xdb, 0xab, 0x93, 0x71, 0xd3, 0x23, 0x4b, 0x71, 0xd1, 0xb9, 0x81, 0x89,
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0x91, 0x89, 0xd1, 0x91, 0x81, 0x89, 0x91, 0xd2, 0x6b, 0x9b, 0x3a, 0x23, 0x2b, 0x30, 0x02, 0x00,
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0x00, 0x04, 0x00, 0x40 ]
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if (len(v2gframe)<9):
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print("size too small")
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else:
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if ((v2gframe[0]!=0x01) or (v2gframe[1]!=0xFE)):
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print("wrong V2GTP version")
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else:
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if ((v2gframe[2]!=0x80) or (v2gframe[3]!=0x01)):
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print("wrong payload type, expecting 0x8001 EXI")
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else:
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exiLen = (v2gframe[4]<<24) + (v2gframe[5]<<16) + (v2gframe[6]<<8) + v2gframe[7]
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print("exiLen=" + str(exiLen))
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if (exiLen+8 != len(v2gframe)):
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print("exiLen does not match actual frame size")
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else:
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print("header ok")
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exiframe = bytearray(exiLen)
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exiframe = v2gframe[8:]
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showAsHex(exiframe, "exiframe ")
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# Header:
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# 80 upper two bits: distinguishing bits 1 0
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# presenceBitForExiOptions 0 means "no options"
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# five bits version information: 0 0 0 0 0 means "final version 1"
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#
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# 00 DB AB 93 71 D3 23 4B
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43
demo_socket.py
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demo_socket.py
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# explanation of socket handling:
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# https://realpython.com/python-sockets/
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#
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import socket
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import select
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print("Press Ctrl-Break for aborting")
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TCP_IP = 'fe80::e0ad:99ac:52eb:85d3'
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TCP_PORT = 15118 # The port for CCS
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BUFFER_SIZE = 1024 # Normally 1024
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ourSocket = socket.socket(socket.AF_INET6, socket.SOCK_STREAM, 0)
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ourSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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ourSocket.bind((TCP_IP, TCP_PORT))
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ourSocket.listen(1)
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print("listening on port " + str(TCP_PORT))
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# example from https://stackoverflow.com/questions/5308080/python-socket-accept-nonblocking
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read_list = [ourSocket]
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while True:
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# The select() function will block until one of the socket states has changed.
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# We specify a timeout, to be able to run it in the main loop.
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print("before select")
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readable, writable, errored = select.select(read_list, [], [], 0.5)
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for s in readable:
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if s is ourSocket:
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client_socket, address = ourSocket.accept()
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read_list.append(client_socket)
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print("Connection from", address)
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else:
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data = s.recv(1024)
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if data:
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print("received data:", data)
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else:
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print("connection closed")
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s.close()
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read_list.remove(s)
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