通用工业协议，Python脚本失败

Question

上下文——我一直在为通用工业协议运行python自动化脚本，使用scapy作为以这种格式创建数据包的方法

在Python3.4环境中运行脚本没有问题，但是当尝试迁移到新环境时，基本上在使用Python3.6稍微升级的环境中运行相同的脚本，我得到以下错误

2020-08-26T12:14:02: %EASYPY-ERROR: Caught error during task execution: Task-2: id_cip_test1.py
2020-08-26T12:14:02: %EASYPY-ERROR: Traceback (most recent call last):
2020-08-26T12:14:02: %EASYPY-ERROR:   File "/users/alpeck/pyats3.6/lib/python3.6/site-packages/pyats/aetest/main.py", line 187, in run
2020-08-26T12:14:02: %EASYPY-ERROR:     testscript = TestScript.from_source(self.testable, self.reporter)
2020-08-26T12:14:02: %EASYPY-ERROR:   File "/users/alpeck/pyats3.6/lib/python3.6/site-packages/pyats/aetest/script.py", line 68, in from_source
2020-08-26T12:14:02: %EASYPY-ERROR:     module = loader.load(testable)
2020-08-26T12:14:02: %EASYPY-ERROR:   File "/users/alpeck/pyats3.6/lib/python3.6/site-packages/pyats/utils/import_utils/flex.py", line 64, in load
2020-08-26T12:14:02: %EASYPY-ERROR:     module = self.load_module_from_file(obj)
2020-08-26T12:14:02: %EASYPY-ERROR:   File "/users/alpeck/pyats3.6/lib/python3.6/site-packages/pyats/utils/import_utils/flex.py", line 117, in load_module_from_file
2020-08-26T12:14:02: %EASYPY-ERROR:     module = loader.load_module()
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap_external>", line 399, in _check_name_wrapper
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap_external>", line 823, in load_module
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap_external>", line 682, in load_module
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap>", line 265, in _load_module_shim
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap>", line 684, in _load
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap_external>", line 678, in exec_module
2020-08-26T12:14:02: %EASYPY-ERROR:   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
2020-08-26T12:14:02: %EASYPY-ERROR:   File "/users/alpeck/pyats/Automation/CIP_Automation/cip_sanity/17_4/petra/id_cip_test1.py", line 40, in <module>
2020-08-26T12:14:02: %EASYPY-ERROR:     client = plc.PLCClient(str(cip_interface.connections['a'].ip))
2020-08-26T12:14:02: %EASYPY-ERROR:   File "/users/alpeck/pyats3.6/lib/python3.6/site-packages/plc.py", line 65, in __init__
2020-08-26T12:14:02: %EASYPY-ERROR:     self.sock.send( bytes(sessionpkt,'utf-8'))
2020-08-26T12:14:02: %EASYPY-ERROR: TypeError: encoding without a string argument

这个错误指向一些脚本，但我已经缩小了这个问题的范围，以进一步澄清这个问题

File "/users/alpeck/pyats3.6/lib/python3.6/site-packages/plc.py", line 65, in __init__
     self.sock.send( bytes(sessionpkt,'utf-8'))

--此回溯指向下面的plc.py块--

class PLCClient(object):
    """Handle all the state of an Ethernet/IP session with a PLC"""

    def __init__(self, plc_addr, plc_port=44818):
        if not NO_NETWORK:
            try:
                self.sock = socket.create_connection((plc_addr, plc_port))
                print('Printing self sock')             --> Printing self sock
                print(self.sock)                    --> <socket.socket fd=17, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('64.101.134.34', 15065), raddr=('10.89.157.229', 44818)>
            except socket.error as exc:
                logger.warn("socket error: %s", exc)
                logger.warn("Continuing without sending anything")
                self.sock = None
        else:
            self.sock = None
        self.session_id = 0
        self.enip_connid = 0
        self.sequence = 1



        # Open an Ethernet/IP session
        sessionpkt = ENIP_TCP() / ENIP_RegisterSession()
        print('Printing session packet')        --> Printing session packet
        print(sessionpkt)               --> b'e\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00'
        if self.sock is not None:
            self.sock.send( bytes(sessionpkt,'utf-8'))
            reply_pkt = self.recv_enippkt()
            self.session_id = reply_pkt.session

上述问题突出显示，显示的会话数据包中没有数据或数据损坏

sessionpkt=ENIP_TCP（）/ENIP_RegisterSession（）

会话数据包在另一个目录中创建，如下所示

class ENIP_RegisterSession(scapy_all.Packet):
    name = "ENIP_RegisterSession"
    fields_desc = [
        scapy_all.LEShortField("protocol_version", 1),
        scapy_all.LEShortField("options", 0),
    ]



class ENIP_TCP(scapy_all.Packet):
    """Ethernet/IP packet over TCP"""
    name = "ENIP_TCP"
    fields_desc = [
        scapy_all.LEShortEnumField("command_id", None, {
            0x0004: "ListServices",
            0x0063: "ListIdentity",
            0x0064: "ListInterfaces",
            0x0065: "RegisterSession",
            0x0066: "UnregisterSession",
            0x006f: "SendRRData",  # Send Request/Reply data
            0x0070: "SendUnitData",
        }),
        scapy_all.LEShortField("length", None),
        scapy_all.LEIntField("session", 0),
        scapy_all.LEIntEnumField("status", 0, {0: "success"}),
        scapy_all.LELongField("sender_context", 0),
        scapy_all.LEIntField("options", 0),
    ]

如果还有什么可以帮助解决这个错误，我可以提供进一步的信息