Support all couplers current coupler depend on, not just the first one.

coupler/cli.h

@@ -177,6 +177,7 @@ void handleCLI(int argc, char **argv) {
     printf("Heart beat interval=%d ms\n", arguments.heart_beat_interval);
     printf("Heart beat timeout interval=%d ms\n", arguments.heart_beat_timeout_interval);
     printf("Heart beat ID list=%s\n", arguments.heart_beat_id_list);
+    printf("Heart beat ID list count=%d\n", HEART_BEAT_ID_LIST_COUNT);
     printf("Network address URL data type=%s\n", arguments.network_address_url_data_type);
     printf("Network interface=%s\n", arguments.network_interface);
 
@@ -219,6 +220,8 @@ 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;
+      // add to counter
+      HEART_BEAT_ID_LIST_COUNT += 1;
       // enable heart beat checks
       ENABLE_HEART_BEAT_CHECK = true;
       tk = strtok(NULL, ",");

coupler/keep_alive.h

@@ -59,6 +59,9 @@ static int HEART_BEAT_TIMEOUT_INTERVAL = DEFAULT_HEART_BEAT_TIMEOUT_INTERVAL;
 // assume maximum of 127 couplers!
 unsigned int HEART_BEAT_ID_LIST[127] = {0};
 
+// the count of all couplers we depend on.
+unsigned int HEART_BEAT_ID_LIST_COUNT = 0;
+
 // the interval for publishing messages
 static int PUBLISHING_INTERVAL = 10;
 

coupler/keep_alive_subscriber.h

@@ -65,7 +65,15 @@ static void dataChangeNotificationCallback(UA_Server *server, UA_UInt32 monitore
         coupler_id = (int) heart_beat;
         // it is completely normal to have same multicast group keep alive
         // messages from different couplers thus filter and leave ones we care for
-        bool is_coupler_id_interesting = (coupler_id == HEART_BEAT_ID_LIST[0]);
+        bool is_coupler_id_interesting = false;
+        for (int i = 0; i < HEART_BEAT_ID_LIST_COUNT; i++) {
+          if (coupler_id == HEART_BEAT_ID_LIST[i]){
+            // we care for this ID
+            is_coupler_id_interesting = true;
+            break;
+          }
+        }
+
         if ((coupler_id!=(unsigned int)COUPLER_ID) && (is_coupler_id_interesting)){
           /*UA_LOG_INFO(UA_Log_Stdout,
                       UA_LOGCATEGORY_USERLAND,