SIENTIAPDE-988

Enhance README and Docker setup; improve IngestorManager and DataManager functionality, add error handling, and implement unit tests for OPC initialization and subscription management.

ingestor/managers/opc_manager.py

@@ -40,6 +40,7 @@ class OpcManager():
             server_config.get('cert_path'), server_config.get(
                 'private_key_path'), server_config.get('server_cert_path')
         )
+        self.config = server_config
 
     def set_security(self):
         """
@@ -140,6 +141,8 @@ class OpcManager():
             raise ValueError(
                 "Subscription not created. Call create_subscription first.")
 
+        self.logger.info(f"Subscribing to {subscription}...")
+        self.logger.info(f"Subscribing to nodes: {nodes}")
         self.addr_nodes = [self.client.get_node(
             n) for n in nodes if n not in self.nodes]
         self.nodes.update(nodes)
@@ -156,8 +159,9 @@ class OpcManager():
     def unsubscribe(self, subscription: str):
 
         if not self.subscriptions.get(subscription):
-            raise ValueError(
-                "Subscription not created. Call create_subscription first.")
+            self.logger.warning(
+                f"Subscription {subscription} not found. Cannot unsubscribe.")
+            return
         self.subscriptions[subscription].delete()
         del self.subscriptions[subscription]
         self.logger.info(f"Unsubscribed from {subscription}.")
@@ -177,10 +181,14 @@ class OpcManager():
         """
 
         self.logger.warning('Disconnecting from OPC server')
+        if self.client is None:
+            self.logger.warning("Client already disconnected.")
+            return
         try:
             [self.subscriptions[sub].delete() for sub in self.subscriptions]
             self.logger.warning("Deleted all subscriptions.")
-            self.client.disconnect()
+            del self.client
+            self.client = None
             self.logger.warning("Disconnected from OPC UA server.")
         except Exception as sub_error:
             self.logger.error(f"Failed to clean up subscription: {sub_error}")
@@ -217,7 +225,7 @@ class OpcManager():
         data = {
             'tag': tag,
             'name': self.nodes[str(node)]['tag_name'],
-            'timestamp': source_timestamp,
+            'timestamp': source_timestamp.strftime('%Y-%m-%d %H:%M:%S'),
             'value': value
         }