Help needed with CPS twinning

[sebavarghese]

Hi,

I am trying to use the cps twinning framework, with the example specification file (CandyFactory.aml). I am facing some issues with the instantiation of PLC node (as I am getting socket errors). I would like to get clarifications on a few questions as put below:

1. Is it possible to run this framework without a physical twin running along? As of now, I am not using the state replication module. I have installed mininet-wifi and matiec and cloned to the cps twinning repository. When I run ‘make twinning’ and ‘twinning misc/specification/CandyFactory.aml’, the topology is built correctly. But when I try to run ‘show_tags PLC1’ or get/set tags, it throws a socket error as seen in the attached file.
   

Note: I even tried using the code available as tag v0.0.2 (without state replication), still I face the same issues as mentioned above.
2. Also, I believe a physical twin must be run parallel with the framework in order to use state replication. Is this correct?

I would like to know whether I miss configuring anything else. Your help is much appreciated.

[MatthiasEckhart]

Hi,

1. Yes, you don't need a physical twin to run the framework. The state replication module is only needed to synchronize the digital twins with their physical counterparts. Note that the provided state replication code is tailored to a specific physical setup and should merely provide guidance on how to adapt the state replication method to your needs.

From the stack trace it seems that /tmp/cps-twinning/plc_socket is missing. Could you please post a snippet of your /tmp/cps-twinning.log?

2. Yes, this is correct.

Note that the provided framework is just a proof of concept and has therefore serious limitations in terms of stability and functionality. However, I am currently developing a new version of CPS Twinning from scratch as part of the SecurityTwin project. The new version will be open source as well and published when reaching the first milestone.

[sebavarghese]

Thank you for your response.

For some reason, cps-twinning.log is empty. I am not sure if this is because of the below-highlighted error. I will try again and provide you the logs.

[MatthiasEckhart]

After running make twinning, several files should have been created in /tmp/cps-twinning. Could you please also check this directory?

[sebavarghese]

On running make twinning, cps-twinning.log and cps-twinning-states.log are created. Both of which are empty.
On running twinning <.aml>, other files and folders get created as shown in capture.

[sebavarghese]

Before hitting this issue, there was an error which read:
File "/home/seba/cps-twinning/env/lib/python2.7/site-packages/kafka/client_async.py", line 234, in init
self.config['api_version'] = self.check_version(timeout=check_timeout)
File "/home/seba/cps-twinning/env/lib/python2.7/site-packages/kafka/client_async.py", line 830, in check_version
raise Errors.NoBrokersAvailable()
kafka.errors.NoBrokersAvailable: NoBrokersAvailable

For this, I have commented out the Kafka lines in twins.py code. However, on uncommenting them, I see some logs in cps-twinning.log.

[MatthiasEckhart]

Sorry, yes, you are correct after running twinning *.aml, some files in the /tmp/cps-twinning folder should have been created.

Probably, the easiest option would be to run Apache Kafka and adapt the IP address in the constants.py accordingly. The Kafka errors should then be gone, provided that your machine that runs CPS Twinning is able to reach your Kafka broker.

[sebavarghese]

After running Apache Kafka and changing IP address, kafka errors are resolved.

But still, the main error exists.
cpstwinning> show_tags PLC1
Traceback (most recent call last):
File "run.py", line 27, in
net=net)
File "run.py", line 17, in init
CLI(self.net)
File "/usr/local/lib/python2.7/dist-packages/mininet_wifi-2.2.1d1-py2.7.egg/mininet/wifi/cli.py", line 10, in init
CLI.init(self, mininet, stdin=sys.stdin, script=None)
File "/usr/local/lib/python2.7/dist-packages/mininet_wifi-2.2.1d1-py2.7.egg/mininet/cli.py", line 68, in init
self.run()
File "/usr/local/lib/python2.7/dist-packages/mininet_wifi-2.2.1d1-py2.7.egg/mininet/cli.py", line 103, in run
self.cmdloop()
File "/usr/lib/python2.7/cmd.py", line 142, in cmdloop
stop = self.onecmd(line)
File "/usr/lib/python2.7/cmd.py", line 221, in onecmd
return func(arg)
File "/home/seba/cps-twinning/cpstwinning/cli.py", line 64, in do_show_tags
output(node.show_tags())
File "/home/seba/cps-twinning/cpstwinning/twins.py", line 121, in show_tags
result = self.__send_message(ShowTagsMessage())
File "/home/seba/cps-twinning/cpstwinning/twins.py", line 65, in __send_message
self.__send(msg)
File "/home/seba/cps-twinning/cpstwinning/twins.py", line 61, in __send
self.__create_connection()
File "/home/seba/cps-twinning/cpstwinning/twins.py", line 58, in __create_connection
self.conn = Client(address)
File "/usr/lib/python2.7/multiprocessing/connection.py", line 169, in Client
c = SocketClient(address)
File "/usr/lib/python2.7/multiprocessing/connection.py", line 308, in SocketClient
s.connect(address)
File "/usr/lib/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 2] No such file or directory

[MatthiasEckhart]

Okay, thanks for the update. Are you using the forked version of Mininet-WiFi?

[sebavarghese]

Yes, I am using the forked version.

[MatthiasEckhart]

Okay, good. This version of CPS Twinning is not being actively developed any longer, and I currently don't have a running setup on my machine. Probably, the fastest way to resolve this issue is to send me your VM. Would this be an option for you?

[1939552724]

Hello,when I run the command "show_tags PLC1", the program raises a error. On line 127 of the function “show_tags(self)” in "twins.py", the program raises a error like "KeyError: name". Could you help me solve this problem? Thank you!