PEV no-GUI version with autostart on Raspberry

pevNoGui.py

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+
+# The non-GUI variant of the PEV side
+
+import time
+import pyPlcWorker
+from pyPlcModes import *
+import sys # for argv
+
+def cbAddToTrace(s):
+    print(s)
+
+def cbShowStatus(s, selection=""):
+    pass
+
+myMode = C_PEV_MODE
+
+isSimulationMode=0
+if (len(sys.argv) > 1):
+    if (sys.argv[1] == "S"):
+        isSimulationMode=1
+
+print("starting in PEV_MODE")
+print("press Ctrl-C to exit")
+
+worker=pyPlcWorker.pyPlcWorker(cbAddToTrace, cbShowStatus, myMode, isSimulationMode)
+
+nMainloops=0
+while (1):
+    time.sleep(.03) # 'do some calculation'
+    nMainloops+=1
+    worker.mainfunction()
+        
+#---------------------------------------------------------------

starter.py

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+
+# https://noisefloor-net.blogspot.com/2015/10/systemd-timer-unter-raspbian.html
+# In  /etc/systemd/system we need to create 2 files:
+#  pevStarter.service
+#  pevStarter.timer
+# cd /etc/systemd/system
+# sudo nano pevStarter.service
+#  ... add content...
+# sudo nano pevStarter.timer
+#  ... add content ...
+# Make executable:
+# sudo chmod +x pevStarter.*
+# start and enable the unit:
+# sudo systemctl start pevStarter.timer
+# sudo systemctl enable pevStarter.timer
+
+# https://gist.github.com/emxsys/a507f3cad928e66f6410e7ac28e2990f
+
+# View log:
+#  journalctl --unit=pevStarter
+
+# sudo systemctl status pevStarter
+
+import subprocess
+import datetime
+from time import sleep
+
+
+def writeStartLog():
+    file_object = open('/home/pi/myprogs/pyPlc/starterlog.txt', 'a')
+    now = datetime.datetime.now()
+    s = str(now)
+    file_object.write("starter was started at " + s + "\n") 
+    file_object.close()
+
+def checking():
+    file_object = open('/home/pi/myprogs/pyPlc/starterlog.txt', 'a')
+    #file_object.write('hello\n')
+    now = datetime.datetime.now()
+    s = str(now)
+    file_object.write("It is " + s + "\n") 
+
+    command = "ps"
+    param1 = "axj"
+    result = subprocess.run(
+            [command, param1], capture_output=True, text=True)
+
+    if (len(result.stderr)>0):
+        strOut = "Error:" + result.stderr + "\n"
+    else:
+        strOut = result.stdout
+
+    blRunning=False
+    lines = strOut.split("\n")
+    for line in lines:
+        if (line.find("pevNoGui.py")>0):
+            blRunning = True
+
+    if (blRunning):
+        file_object.write("its running\n")
+    else:
+        file_object.write("its NOT running. Trying to start...\n")
+        #processvar = subprocess.Popen(["python", "/home/pi/myprogs/pyPlc/pevNoGui.py"])
+        result = subprocess.run(["python", "/home/pi/myprogs/pyPlc/pevNoGui.py"])
+        if (len(result.stderr)>0):
+            strOut = "Error:" + result.stderr + "\n"
+        else:
+            strOut = ""
+        strOut = "done\n"
+        file_object.write(strOut)
+        
+    file_object.close()
+
+
+try:
+    writeStartLog()
+    while True:
+        #print("Hello World")
+        checking()
+        sleep(10)
+except KeyboardInterrupt as e:
+    print("Stopping...")
+    

starter.sh

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+#!/bin/bash
+
+date >> /home/pi/myprogs/pyPlc/test2.txt
+pwd >> /home/pi/myprogs/pyPlc/test2.txt
+cd /home/pi/myprogs/pyPlc/
+/usr/bin/python /home/pi/myprogs/pyPlc/starter.py
+pwd >> /home/pi/myprogs/pyPlc/test2.txt
+date >> /home/pi/myprogs/pyPlc/test3.txt