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78 lines
2.5 KiB
Markdown
78 lines
2.5 KiB
Markdown
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# Installation on Raspberry Pi
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To try out, we use an old raspberry pi (first generation).
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Install an image on a fresh 16GB SD card, using the Raspberry Pi Imager from https://www.raspberrypi.com/software/.
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Surprise: The imager does not ask for the model of the Raspberry. It just works on the old model. Fine.
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In the Imager, we enable the SSH, this makes it possible to work remote on the raspberry.
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On PC, we install putty, so that we are able to open an remote shell.
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Start putty and connect to the raspberry.
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Install samba server on the raspberry, to be able to access the files from remote. https://www.elektronik-kompendium.de/sites/raspberry-pi/2007071.htm
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Install wireshark
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sudo apt-get install wireshark
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Choose "yes" for the question whether other users shall be able to trace network traffic.
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cd $home
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mkdir myprogs
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cd myprogs
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git clone http://github.com/uhi22/pyPlc
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git clone http://github.com/uhi22/OpenV2Gx
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cd OpenV2Gx/Release
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make
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Test the EXI decoder/encoder
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./OpenV2G DD809a0010d0400000c800410c8000
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./OpenV2G EDa
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cd $home/myprogs/pyPlc
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Check python version
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python --version
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reports e.g. 3.9.2.
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Install the python library for accessing the network interface:
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python -m pip install --upgrade pcap-ct
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also for the superuser (otherwise the import pcap fails)
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sudo python -m pip install --upgrade pcap-ct
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Try-out whether the python is able to sniff ethernet packets:
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cd $home/myprogs/pyPlc/tests
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python test_pcap.py
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Result: Fails due to missing permission. This is normal, we need to run with superuser permissions.
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sudo python test_pcap.py
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This should run through loops 0 to 9. If it stucks at Loop 0, the
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patch for non-blocking is missing.
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Patch is not needed if we use self.sniffer.dispatch.
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Patch the pcap-ct for non-blocking usage:
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Navigate to /usr/local/lib/python3.9/dist-packages/pcap
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cd /usr/local/lib/python3.9/dist-packages/pcap
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Open the file _pcap.py with superuser permissions:
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sudo nano _pcap.py
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Scroll to "def __next__".
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Under the condition "if n == 0: # timeout" replace the line
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continue
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by
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raise StopIteration
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This issue is discussed in https://github.com/karpierz/pcap-ct/issues/9.
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Try again
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sudo python test_pcap.py
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This should run through loops 0 to 9.
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Problem: Each loop needs around 2 seconds. This is not intended. The 10ms timeout
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seems not to work (timeout_ms=10). On win10, this works perfect.
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On Raspberry, the combination of iterator and non-blocking does not work, see
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https://stackoverflow.com/questions/31305712/how-do-i-make-libpcap-pcap-loop-non-blocking.
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Solution: Change to self.sniffer.dispatch instead of for ts, pkt in self.sniffer.
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