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exiconnector made compatible for Raspberry

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uhi22 2022-11-20 14:23:37 +01:00
parent e4a7cd3373
commit f61f68a0ab
2 changed files with 63 additions and 48 deletions
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96
doc/installation_on_raspberry.md
View file

@ -14,64 +14,72 @@ Start putty and connect to the raspberry.
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 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
Install wireshark Install wireshark
sudo apt-get install wireshark ```
sudo apt-get install wireshark
```
Choose "yes" for the question whether other users shall be able to trace network traffic. Choose "yes" for the question whether other users shall be able to trace network traffic.
cd $home
mkdir myprogs
cd myprogs
git clone http://github.com/uhi22/pyPlc Clone the two github repositories, and compile the OpenV2Gx EXI decoder/encoder:
```
git clone http://github.com/uhi22/OpenV2Gx cd $home
cd OpenV2Gx/Release mkdir myprogs
make cd myprogs
git clone http://github.com/uhi22/pyPlc
git clone http://github.com/uhi22/OpenV2Gx
cd OpenV2Gx/Release
make
```
(this may take some minutes)
(In case you later change something in the code, use `make all` to build again.)
Test the EXI decoder/encoder Test the EXI decoder/encoder
./OpenV2G DD809a0010d0400000c800410c8000 ```
./OpenV2G EDa cd $home/myprogs/OpenV2Gx/Release
./OpenV2G.exe DD809a0010d0400000c800410c8000
./OpenV2G.exe EDB_5555aaaa5555aaaa
```
This should run without error and show the decoded/encoded data in the command window.
cd $home/myprogs/pyPlc Now we go to the python part.
```
cd $home/myprogs/pyPlc
```
Check python version Check python version
python --version
`python --version`
reports e.g. 3.9.2. reports e.g. 3.9.2.
Install the python library for accessing the network interface: Install the python library for accessing the network interface.
python -m pip install --upgrade pcap-ct Also for the superuser (otherwise the import pcap fails).
also for the superuser (otherwise the import pcap fails)
sudo python -m pip install --upgrade pcap-ct ```
python -m pip install --upgrade pcap-ct
sudo python -m pip install --upgrade pcap-ct
```
Try-out whether the python is able to sniff ethernet packets: Try-out whether the python is able to sniff ethernet packets:
cd $home/myprogs/pyPlc/tests ```
python test_pcap.py cd $home/myprogs/pyPlc/tests
python test_pcap.py
```
Result: Fails due to missing permission. This is normal, we need to run with superuser permissions. Result: Fails due to missing permission. This is normal, we need to run with superuser permissions.
sudo python test_pcap.py ```
This should run through loops 0 to 9. If it stucks at Loop 0, the sudo python test_pcap.py
patch for non-blocking is missing. ```
Patch is not needed if we use self.sniffer.dispatch.
Patch the pcap-ct for non-blocking usage:
Navigate to /usr/local/lib/python3.9/dist-packages/pcap
cd /usr/local/lib/python3.9/dist-packages/pcap
Open the file _pcap.py with superuser permissions:
sudo nano _pcap.py
Scroll to "def __next__".
Under the condition "if n == 0: # timeout" replace the line
continue
by
raise StopIteration
This issue is discussed in https://github.com/karpierz/pcap-ct/issues/9.
Try again
sudo python test_pcap.py
This should run through loops 0 to 9. This should run through loops 0 to 9.
Problem: Each loop needs around 2 seconds. This is not intended. The 10ms timeout Try-out the cooperation of Python with the EXI encoder/decoder:
seems not to work (timeout_ms=10). On win10, this works perfect. ```
On Raspberry, the combination of iterator and non-blocking does not work, see python exiConnector.py
https://stackoverflow.com/questions/31305712/how-do-i-make-libpcap-pcap-loop-non-blocking. ```
Solution: Change to self.sniffer.dispatch instead of for ts, pkt in self.sniffer. This should run some decoder/encoder tests and report in the end "Number of fails: 0".
Start the EVSE `sudo python pyPlc.py E`.
Open a second console window, and start here the pev in simulation mode
`sudo python pyPlc.py P S`.
We should see how the EVSE and PEV are talking to each other.

15
exiConnector.py
View file

@ -43,6 +43,7 @@ import subprocess
import sys import sys
import time import time
import json import json
import os
# Example data: # Example data:
# (1) From the Ioniq: # (1) From the Ioniq:
@ -83,7 +84,13 @@ exiHexDemoSupportedApplicationProtocolRequest2="8000ebab9371d34b9b79d189a98989c1
# Configuration of the exi converter tool # Configuration of the exi converter tool
pathToOpenV2GExe = "..\\OpenV2Gx\\Release\\OpenV2G.exe"; if os.name == "nt":
# Windows: Path to the EXI decoder/encoder
pathToOpenV2GExe = "..\\OpenV2Gx\\Release\\OpenV2G.exe"
else:
# Linux: Path to the EXI decoder/encoder
pathToOpenV2GExe = "../OpenV2Gx/Release/OpenV2G.exe";
# Functions # Functions
def exiHexToByteArray(hexString): def exiHexToByteArray(hexString):
@ -235,8 +242,8 @@ def testReadExiFromFile():
if __name__ == "__main__": if __name__ == "__main__":
nFail=0 nFail=0
print("Testing exiConnector...") print("Testing exiConnector...")
testReadExiFromFile() #testReadExiFromFile()
exit() #exit()
#testByteArrayConversion("123456") #testByteArrayConversion("123456")
#testByteArrayConversion("1234567") #testByteArrayConversion("1234567")
#testByteArrayConversion("ABCDEF") #testByteArrayConversion("ABCDEF")
@ -300,4 +307,4 @@ if __name__ == "__main__":
#strConverterResult = exiDecode(exiHexToByteArray(exiHexDemoSupportedApplicationProtocolRequest2)) #strConverterResult = exiDecode(exiHexToByteArray(exiHexDemoSupportedApplicationProtocolRequest2))
#print(strConverterResult) #print(strConverterResult)