Add kill by PID for the python script

flows/main.json

@@ -7237,6 +7237,7 @@
         "append": "",
         "useSpawn": "true",
         "timer": "",
+        "winHide": false,
         "oldrc": false,
         "name": "",
         "x": 1090,
@@ -7305,11 +7306,12 @@
         "id": "ed7503f3.d95a48",
         "type": "exec",
         "z": "9daf9e2b.019fc",
-        "command": "sudo killall -15 python3",
+        "command": "sudo kill -15 `cat /tmp/pscope_pid`",
         "addpay": false,
         "append": "",
         "useSpawn": "false",
         "timer": "",
+        "winHide": false,
         "oldrc": false,
         "name": "Python soft kill",
         "x": 740,

scripts/main.py

@@ -78,6 +78,10 @@ if __name__ == "__main__":
     signal.signal(signal.SIGINT, handler_stop_signals)
     signal.signal(signal.SIGTERM, handler_stop_signals)
 
+    # Create script PID file, so it's easy to kill the main process without ravaging all python script in the OS
+    with open('/tmp/pscope_pid', 'w') as f:
+        f.write(str(os.getpid()))
+    
     # check if gpu_mem configuration is at least 256Meg, otherwise the camera will not run properly
     with open("/boot/config.txt", "r") as config_file:
         for i, line in enumerate(config_file):
@@ -190,4 +194,8 @@ if __name__ == "__main__":
     # module_thread.close()
 
     display.stop()
+
+    # Cleanup pid file
+    os.remove('/tmp/pscope_pid')
+    
     logger.info("Bye")