Enable heart beat checks only if we have list of IDs to check.

coupler/opc-ua-server/cli.h

@@ -19,7 +19,7 @@ static struct argp_option options[] = {
   {"heart-beat",  'b', "0", 0, "Publish heart beat to other couplers."},
   {"heart-beat-interval",  't', "500", 0, "Heart beat interval in ms."},
   {"heart-beat-id-list",  'l', "", 0, "Comma separated list of IDs of couplers to watch for heart beats. \
-If heart beat is missing coupler goes to safe mode."},
+                   If a heart beat is missing coupler goes to safe mode."},
   {"network-address-url-data-type", 'n', "opc.udp://224.0.0.22:4840/", 0, "Netwrok address URL type used for Pub/Sub."},
 
   {0}
@@ -114,6 +114,7 @@ void handleCLI(int argc, char **argv) {
     arguments.certificate = "";
     arguments.id = DEFAULT_COUPLER_ID;
     arguments.heart_beat_interval = DEFAULT_HEART_BEAT_INTERVAL;
+    arguments.heart_beat_id_list = "";
     arguments.network_address_url_data_type = NETWORK_ADDRESS_URL_DATA_TYPE;
     argp_parse(&argp, argc, argv, 0, 0, &arguments);
 
@@ -163,6 +164,8 @@ void handleCLI(int argc, char **argv) {
       // from CLI we get a  comma separated list on INTs representing coupler' ID
       result = strtol(tk, &eptr, 16);
       HEART_BEAT_ID_LIST[i++] = result;
+      // enable heart beat checks
+      ENABLE_HEART_BEAT_CHECK = true;
       tk = strtok(NULL, ",");
       }
 }

coupler/opc-ua-server/keep_alive_subscriber.h

@@ -196,10 +196,11 @@ static UA_StatusCode addSubscribedVariables(UA_Server *server, UA_NodeId dataSet
                                            UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE),
                                            vAttr, NULL, &newNode);
         /*monitor variable*/
+	if (ENABLE_HEART_BEAT_CHECK) {
           UA_MonitoredItemCreateRequest monRequest = UA_MonitoredItemCreateRequest_default(newNode);
           UA_Server_createDataChangeMonitoredItem(server, UA_TIMESTAMPSTORETURN_SOURCE,
                                                   monRequest, NULL, dataChangeNotificationCallback);
-
+	}
         /* For creating Targetvariables */
         UA_FieldTargetDataType_init(&targetVars[i].targetVariable);
         targetVars[i].targetVariable.attributeId  = UA_ATTRIBUTEID_VALUE;

coupler/opc-ua-server/server.c

@@ -49,6 +49,7 @@ const int DEFAULT_COUPLER_ID = 0;
 
 int OPC_UA_PORT;
 bool ENABLE_HEART_BEAT = false;
+bool ENABLE_HEART_BEAT_CHECK = false;
 bool ENABLE_X509 = false;
 bool ENABLE_USERNAME_PASSWORD_AUTHENTICATION = false;
 char *USERNAME;