Ensure only one instance is running and publish company info.

main.py

@@ -2,10 +2,11 @@
 import os
 import sys
 import logging
+from PySide6.QtNetwork import QLocalServer, QLocalSocket
 from PySide6.QtWidgets import QSystemTrayIcon
 from PySide6.QtGui import QGuiApplication, QIcon
 from PySide6.QtQml import QQmlApplicationEngine
-#from PySide6.QtCore import QResource
+from PySide6.QtCore import QIODevice #, QResource
 from lib.ConfigLoader import ConfigLoader
 from lib.DB.BusinessModel import BusinessModel
 import rc_pyqcrm
@@ -34,6 +35,7 @@ os.environ['QML_XHR_ALLOW_FILE_READ'] = '1'
 # name=""
 # type=""
 
+
 bad_config = False
 db_con = False
 address_model = None
@@ -85,6 +87,19 @@ if __name__ == "__main__":
     app = QGuiApplication(sys.argv)
     engine = QQmlApplicationEngine()
 
+
+    pyq_sok = QLocalSocket()
+    pyq_sok.connectToServer("PYQCRM_INSTANCE", QIODevice.ReadOnly)
+
+    if pyq_sok.state() == QLocalSocket.ConnectedState:
+        print("PYQCRM already running..")
+        print("Stop the running instance before running the application..")
+        sys.exit(-1)
+    else:
+        print("Starting PYQCRM_INSTANCE")
+        pyq_server = QLocalServer()
+        pyq_server.listen("PYQCRM_INSTANCE")
+
     engine.addImportPath("qrc:/");
 
     # qml_file = Path(__file__).resolve().parent / "Gui/main.qml"