From fc2916cf871e20ef30124a49e70dc0826433dc92 Mon Sep 17 00:00:00 2001
From: uhi22 <uhi@hnng.de>
Date: Fri, 12 May 2023 01:10:19 +0200
Subject: [PATCH] feature: convert pcap to values, and show as scope graph

---
 pcapConverter.py |  35 ++++++-
 scope.py         | 232 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 265 insertions(+), 2 deletions(-)
 create mode 100644 scope.py

diff --git a/pcapConverter.py b/pcapConverter.py
index b98dd05..8894e1e 100644
--- a/pcapConverter.py
+++ b/pcapConverter.py
@@ -26,16 +26,26 @@
 import pyshark
 import exiConnector
 import os
+from helpers import combineValueAndMultiplier
+import json
 
 # The path where the script will search for pcap files:
 directory = '../temp'
 
 
+#"EVSEPresentVoltage.Multiplier": "0",
+#"EVSEPresentVoltage.Value": "318",
+#"EVSEPresentVoltage.Unit": "V",
+#"DC_EVStatus.EVRESSSOC": "53",
+
 def convertPcapToTxt(inputFileName):
     cap = pyshark.FileCapture(inputFileName, display_filter="ipv6")
     fileOut = open(inputFileName + '.decoded.txt', 'w')
     print("# generated by pcapConverter.py", file=fileOut)
     print("# https://github.com/uhi22/pyPLC", file=fileOut)
+    fileOutValues = open(inputFileName + '.values.txt', 'w')
+    print("# generated by pcapConverter.py", file=fileOutValues)
+    print("# https://github.com/uhi22/pyPLC", file=fileOutValues)
     # Example how to access the data:
     #print(cap)
     #print(cap[0])
@@ -58,11 +68,32 @@ def convertPcapToTxt(inputFileName):
                     sHeader = "Packet #" + str(numberOfPackets) + " [" + str(packet.sniff_time) + "] " + strExi + " means:"
                     pre = "DD" # decode DIN
                     decoded=exiConnector.exiDecode(strExi, pre)
-                    print(sHeader)
-                    print(decoded)
+                    #print(sHeader)
+                    #print(decoded)
                     print(sHeader, file=fileOut)
                     print(decoded, file=fileOut)
+                    try:
+                        y = json.loads(decoded)
+                        try:
+                            u = combineValueAndMultiplier(y["EVSEPresentVoltage.Value"], y["EVSEPresentVoltage.Multiplier"])
+                            print("[" + str(packet.sniff_time) + "] EVSEPresentVoltage=" + str(u), file=fileOutValues)
+                            i = combineValueAndMultiplier(y["EVSEPresentCurrent.Value"], y["EVSEPresentCurrent.Multiplier"])
+                            print("[" + str(packet.sniff_time) + "] EVSEPresentCurrent=" + str(i), file=fileOutValues)
+                        except:
+                            pass
+                        try:
+                            soc = y["DC_EVStatus.EVRESSSOC"]
+                            print("[" + str(packet.sniff_time) + "] EVRESSSOC=" + str(soc), file=fileOutValues)
+                        except:
+                            pass
+                    except:
+                        pass
+        if ((numberOfPackets % 100)==0):
+            print(str(numberOfPackets) + " packets")
+        #if (numberOfPackets>=1000):
+        #    break
     fileOut.close()
+    fileOutValues.close()
 
 
 # iterate over files in the directory
diff --git a/scope.py b/scope.py
new file mode 100644
index 0000000..12ffb85
--- /dev/null
+++ b/scope.py
@@ -0,0 +1,232 @@
+
+from tkinter import *
+import time
+import sys # for argv
+
+
+root = Tk()
+root.geometry("600x500")
+lastKey = ''
+lblHelp = Label(root, justify= "left")
+lblHelp['text']="press ctrl C to exit"
+lblHelp.pack()
+
+canvas_width = 590
+canvas_height = 400
+divisionsPerScreen = 10
+
+c = Canvas(root, 
+           width=canvas_width,
+           height=canvas_height)
+c.pack()
+
+
+x0Scope = 10
+y0Scope = 45
+xSizeScope = canvas_width-30
+ySizeScope = canvas_height-50
+# osci background
+c.create_rectangle(x0Scope, y0Scope, x0Scope+xSizeScope,  y0Scope+ySizeScope, fill="black")
+# osci divisions
+for i in range(1, divisionsPerScreen):
+    dx= i*xSizeScope/divisionsPerScreen
+    c.create_line(x0Scope+dx, y0Scope, x0Scope+dx, y0Scope+ySizeScope, fill="#404040")
+    dy= i*ySizeScope/divisionsPerScreen
+    c.create_line(x0Scope, y0Scope+dy, x0Scope+xSizeScope, y0Scope+dy, fill="#404040")
+# osci outer border
+c.create_line(x0Scope, y0Scope, x0Scope+xSizeScope, y0Scope, fill="#FFFFFF")
+c.create_line(x0Scope, y0Scope, x0Scope, y0Scope+ySizeScope, fill="#FFFFFF")
+c.create_line(x0Scope+xSizeScope, y0Scope+ySizeScope, x0Scope+xSizeScope, y0Scope, fill="#FFFFFF")
+c.create_line(x0Scope+xSizeScope, y0Scope+ySizeScope, x0Scope, y0Scope+ySizeScope, fill="#FFFFFF")
+
+
+inputFileName = "../temp/2023-05-11_205813_tcpdump.pcap.values.txt"
+fileIn = open(inputFileName, 'r')
+Lines = fileIn.readlines()
+
+strCh1Color="#FFFF00" # yellow
+strCh2Color="#10FF10" # green
+strCh3Color="#4040FF" # blue
+
+strChannelName1=""
+strChannelName2=""
+strChannelName3=""
+ch1values = []
+ch2values = []
+ch3values = []
+count = 0
+for line in Lines:
+    count += 1
+    p1 = line.find("] ")
+    p2 = line.find("=")
+    if (p1>0) and (p2>p1+3):
+        s = line[p1+2:p2]
+        if (strChannelName1==""):
+            strChannelName1=s
+        else:
+            if ((strChannelName2=="") and (s!=strChannelName1)):
+                strChannelName2=s
+            else:
+                if ((strChannelName3=="") and (s!=strChannelName1) and (s!=strChannelName2)):
+                    strChannelName3=s
+        if (s==strChannelName1):
+            sVal=line[p2+1:].strip()
+            ch1values.append(float(sVal))
+        if (s==strChannelName2):
+            sVal=line[p2+1:].strip()
+            ch2values.append(float(sVal))
+        if (s==strChannelName3):
+            sVal=line[p2+1:].strip()
+            ch3values.append(float(sVal))
+    #print("Line{}: {}".format(count, line.strip()))
+fileIn.close()
+
+vMin=ch1values[0]
+vMax=ch1values[0]
+for v in ch1values:
+    #print(v)
+    if (v<vMin):
+        vMin = v
+    if (v>vMax):
+        vMax = v
+
+print("min=" + str(vMin) + ", max=" + str(vMax))
+vDelta = vMax - vMin
+perDiv1 = 1
+if (vDelta/perDiv1>10):
+    perDiv1=2
+if (vDelta/perDiv1>10):
+    perDiv1=5
+if (vDelta/perDiv1>10):
+    perDiv1=10
+if (vDelta/perDiv1>10):
+    perDiv1=20
+if (vDelta/perDiv1>10):
+    perDiv1=50
+if (vDelta/perDiv1>10):
+    perDiv1=100
+print("Scale: " + str(perDiv1) + "/div")
+
+offs1 = 0
+while ((offs1+perDiv1)<vMin):
+    offs1+=perDiv1
+print("Offset: " + str(offs1))
+
+x =  x0Scope
+for v in ch1values:
+    yPix =  y0Scope+ySizeScope - (v - offs1)/perDiv1 * ySizeScope / divisionsPerScreen
+    x1, y1 = ( x - 1 ), ( yPix - 1 )
+    x2, y2 = ( x + 1 ), ( yPix + 1 )
+    c.create_line(x1, y1, x2, y2, fill=strCh1Color)
+    c.create_line(x1, y2, x2, y1, fill=strCh1Color)
+    x+=0.035
+
+vMin=ch2values[0]
+vMax=ch2values[0]
+for v in ch2values:
+    #print(v)
+    if (v<vMin):
+        vMin = v
+    if (v>vMax):
+        vMax = v
+
+print("min=" + str(vMin) + ", max=" + str(vMax))
+vDelta = vMax - vMin
+perDiv2 = 1
+if (vDelta/perDiv2>10):
+    perDiv2=2
+if (vDelta/perDiv2>10):
+    perDiv2=5
+if (vDelta/perDiv2>10):
+    perDiv2=10
+if (vDelta/perDiv2>10):
+    perDiv2=20
+if (vDelta/perDiv2>10):
+    perDiv2=50
+if (vDelta/perDiv2>10):
+    perDiv2=100
+print("Scale: " + str(perDiv2) + "/div")
+
+offs2 = 0
+while ((offs2+perDiv2)<vMin):
+    offs2+=perDiv2
+print("Offset: " + str(offs2))
+
+x =  x0Scope
+for v in ch2values:
+    yPix =  y0Scope+ySizeScope - (v - offs2)/perDiv2 * ySizeScope / divisionsPerScreen
+    x1, y1 = ( x - 1 ), ( yPix - 1 )
+    x2, y2 = ( x + 1 ), ( yPix + 1 )
+    c.create_line(x1, y1, x2, y2, fill=strCh2Color)
+    c.create_line(x1, y2, x2, y1, fill=strCh2Color)
+    x+=0.035
+
+
+vMin=ch3values[0]
+vMax=ch3values[0]
+for v in ch3values:
+    #print(v)
+    if (v<vMin):
+        vMin = v
+    if (v>vMax):
+        vMax = v
+
+print("min=" + str(vMin) + ", max=" + str(vMax))
+vDelta = vMax - vMin
+perDiv3 = 1
+if (vDelta/perDiv3>10):
+    perDiv3=2
+if (vDelta/perDiv3>10):
+    perDiv3=5
+if (vDelta/perDiv3>10):
+    perDiv3=10
+if (vDelta/perDiv3>10):
+    perDiv3=20
+if (vDelta/perDiv3>10):
+    perDiv3=50
+if (vDelta/perDiv3>10):
+    perDiv3=100
+print("Scale: " + str(perDiv3) + "/div")
+
+offs3 = 0
+while ((offs3+perDiv3)<vMin):
+    offs3+=perDiv3
+print("Offset: " + str(offs3))
+
+x =  x0Scope
+for v in ch3values:
+    yPix =  y0Scope+ySizeScope - (v - offs1)/perDiv3 * ySizeScope / divisionsPerScreen
+    x1, y1 = ( x - 1 ), ( yPix - 1 )
+    x2, y2 = ( x + 1 ), ( yPix + 1 )
+    c.create_line(x1, y1, x2, y2, fill=strCh3Color)
+    c.create_line(x1, y2, x2, y1, fill=strCh3Color)
+    x+=0.035
+
+
+    
+y0Legend = 0
+ySizeLegend = 40
+# legend background
+c.create_rectangle(x0Scope, y0Legend, x0Scope+xSizeScope,  y0Legend+ySizeLegend, fill="black")
+
+c.create_text(x0Scope,y0Legend+0, text=strChannelName1, anchor="nw", fill=strCh1Color)
+c.create_text(x0Scope,y0Legend+10, text=str(perDiv1) + "/div", anchor="nw", fill=strCh1Color)
+c.create_text(x0Scope,y0Legend+20, text="Offs " + str(offs1), anchor="nw", fill=strCh1Color)
+
+c.create_text(x0Scope+150,y0Legend+0, text=strChannelName2, anchor="nw", fill=strCh2Color)
+c.create_text(x0Scope+150,y0Legend+10, text=str(perDiv2) + "/div", anchor="nw", fill=strCh2Color)
+c.create_text(x0Scope+150,y0Legend+20, text="Offs " + str(offs2), anchor="nw", fill=strCh2Color)
+
+c.create_text(x0Scope+300,y0Legend+0, text=strChannelName3, anchor="nw", fill=strCh3Color)
+c.create_text(x0Scope+300,y0Legend+10, text=str(perDiv3) + "/div", anchor="nw", fill=strCh3Color)
+c.create_text(x0Scope+300,y0Legend+20, text="Offs " + str(offs3), anchor="nw", fill=strCh3Color)
+
+lastKey = ''
+
+root.update()
+nMainloops=0
+while lastKey!="x":
+    time.sleep(.03) # 'do some calculation'
+    nMainloops+=1
+    # print(str(nMainloops) + " " + str(nKeystrokes)) # show something in the console window
+    root.update()