Tidy up tag accounting

Inc/uicolours_default.h

@@ -19,6 +19,7 @@
 #define C_VERB_INFO  C_LCYAN       /* Verbal level info */
 #define C_VERB_DEBUG C_LGREEN      /* Verbal level debug */
 #define C_DATA       C_YELLOW      /* Output data value */
+#define C_NOCHAN     C_LRED        /* No consumer set for channel */
 #define C_DEFAULT    C_WHITE
 
 #define C_SEL        C_LCYAN       /* Element selection */

Src/nwclient.c

@@ -212,40 +212,43 @@ void nwclientSend( struct nwclientsHandle *h, uint32_t len, const uint8_t *ipbuf
 {
     const struct timespec ts = {.tv_sec = 1, .tv_nsec = 0};
 
-    if ( _lock_with_timeout( &h->clientList, &ts ) < 0 )
-    {
-        genericsExit( -1, "Failed to acquire mutex" EOL );
-    }
-
-    /* Now kick all the clients that new data arrived for them to distribute */
-    volatile struct nwClient *n = h->firstClient;
-
-    while ( n )
+    if ( h && h->firstClient )
     {
-        ssize_t t = len;
-        ssize_t sent = 0;
-        void *p = ( void * )ipbuffer;
-
-        while ( t && ( sent >= 0 ) )
+        if ( _lock_with_timeout( &h->clientList, &ts ) < 0 )
         {
-            sent = send( n->portNo, p, t, MSG_NOSIGNAL );
-            p += sent;
-            t -= sent;
+            genericsExit( -1, "Failed to acquire mutex" EOL );
         }
 
-        if ( t )
-        {
-            volatile struct nwClient *newn = n->nextClient;
-            _clientRemoveNoLock( n );
-            n = newn;
-        }
-        else
+        /* Now kick all the clients that new data arrived for them to distribute */
+        volatile struct nwClient *n = h->firstClient;
+
+        while ( n )
         {
-            n = n->nextClient;
+            ssize_t t = len;
+            ssize_t sent = 0;
+            void *p = ( void * )ipbuffer;
+
+            while ( t && ( sent >= 0 ) )
+            {
+                sent = send( n->portNo, p, t, MSG_NOSIGNAL );
+                p += sent;
+                t -= sent;
+            }
+
+            if ( t )
+            {
+                volatile struct nwClient *newn = n->nextClient;
+                _clientRemoveNoLock( n );
+                n = newn;
+            }
+            else
+            {
+                n = n->nextClient;
+            }
         }
-    }
 
-    pthread_mutex_unlock( &h->clientList );
+        pthread_mutex_unlock( &h->clientList );
+    }
 }
 // ====================================================================================================
 struct nwclientsHandle *nwclientStart( int port )