Added OPC-UA Connector features:

 - disableSubscriptions - true will disable subscriptions and activates read values in nodes only on scanning/re-scanning.
 - subCheckPeriodInMillis - interval in milliseconds to check information in nodes from subscription.

.gitignore

@@ -21,3 +21,4 @@ thingsboard_gateway/storage/data/
 /logs/
 __pycache__
 /thingsboard_gateway/config/
+/venv/

for_build/DEBIAN/pydist-overrides

@@ -8,4 +8,5 @@ pyserial python3-pyserial; PEP386
 pyyaml python3-PyYAML; PEP386
 pyrsistent python3-pyrsistent; PEP386
 importlib python3-importlib; PEP386
-jsonparh-rw python3-jsonpath-rw; PEP386
+jsonparh-rw python3-jsonpath-rw; PEP386
+regex python3-regex; PEP386

thingsboard_gateway/config/opcua.json

@@ -2,10 +2,12 @@
   "server": {
     "name": "OPC-UA Default Server",
     "url": "localhost:4840/freeopcua/server/",
-    "scanPeriodInMillis": 10000,
     "timeoutInMillis": 5000,
-    "security": "Basic128Rsa15",
+    "scanPeriodInMillis": 5000,
+    "disableSubscriptions":false,
+    "subCheckPeriodInMillis": 100,
     "showMap": false,
+    "security": "Basic128Rsa15",
     "identity": {
       "type": "anonymous"
     },

thingsboard_gateway/connectors/opcua/opcua_connector.py

@@ -115,7 +115,10 @@ def run(self):
                 log.info("OPC-UA connector %s connected to server %s", self.get_name(), self.__server_conf.get("url"))
         self.__opcua_nodes["root"] = self.client.get_objects_node()
         self.__opcua_nodes["objects"] = self.client.get_objects_node()
-        self.__sub = self.client.create_subscription(self.__server_conf.get("scanPeriodInMillis", 500), self.__sub_handler)
+        if not self.__server_conf.get("disableSubscriptions", False):
+            self.__sub = self.client.create_subscription(self.__server_conf.get("subCheckPeriodInMillis", 500), self.__sub_handler)
+        else:
+            self.__sub = False
         self.__scan_nodes_from_config()
         self.__previous_scan_time = time.time() * 1000
         log.debug('Subscriptions: %s', self.subscribed)
@@ -127,10 +130,11 @@ def run(self):
                 if not self.__connected and not self.__stopped:
                     self.client.connect()
                 elif not self.__stopped:
-                    if time.time()*1000 - self.__previous_scan_time > self.__server_conf.get("scanPeriodInMillis", 60000):
+                    if self.__server_conf.get("disableSubscriptions", False) and time.time()*1000 - self.__previous_scan_time > self.__server_conf.get("scanPeriodInMillis", 60000):
                         self.__scan_nodes_from_config()
                         self.__previous_scan_time = time.time() * 1000
-                    elif self.data_to_send:
+
+                    if self.data_to_send:
                         self.__gateway.send_to_storage(self.get_name(), self.data_to_send.pop())
                 if self.__stopped:
                     self.close()
@@ -285,9 +289,9 @@ def __search_nodes_and_subscribe(self, device_info):
                         self.data_to_send.append(converted_data)
                         self.statistics['MessagesSent'] += 1
                         if self.__sub is None:
-                            self.__sub = self.client.create_subscription(self.__server_conf.get("scanPeriodInMillis", 500),
-                                                                         self.__sub_handler)
-                        self.__sub.subscribe_data_change(information_node)
+                            self.__sub = self.client.create_subscription(self.__server_conf.get("subCheckPeriodInMillis", 500), self.__sub_handler)
+                        if self.__sub:
+                            self.__sub.subscribe_data_change(information_node)
                         log.debug("Added subscription to node: %s", str(information_node))
                         log.debug("Data to ThingsBoard: %s", converted_data)
                     else:
@@ -412,7 +416,8 @@ def __search_node(self, current_node, fullpath, search_method=False, result=[]):
                     if self.__show_map:
                         log.debug("SHOW MAP: Current node path: %s - NODE FOUND", new_node_path)
                     if new_node_class == ua.NodeClass.Object:
-                        log.debug("Search in %s", new_node_path)
+                        if self.__show_map:
+                            log.debug("SHOW MAP: Search in %s", new_node_path)
                         self.__search_node(new_node, fullpath, result=result)
                     elif new_node_class == ua.NodeClass.Variable:
                         log.debug("Found in %s", new_node_path)