diff -r 3d4d0e0dd4de -r f48fa3532729 src/lib/app.js
--- a/src/lib/app.js	Thu Aug 14 19:14:04 2014 +0200
+++ b/src/lib/app.js	Thu Aug 14 19:15:12 2014 +0200
@@ -37,6 +37,8 @@
 |                                                          |
 | Support: http://list.europalab.com/mailman/mdnsgs/       |
 |                                                          |
+| Test: dig @nodeapp.host.tld A realhost.local             |
+|                                                          |
 ***********************************************************/
 
 // import module dependencies
@@ -55,6 +57,24 @@
   cleardb();
 });
 
+// format a date and time
+function getDateTime() {
+    var date = new Date();
+    var hour = date.getHours();
+    hour = (hour < 10 ? '0' : '') + hour;
+    var min  = date.getMinutes();
+    min = (min < 10 ? '0' : '') + min;
+    var sec  = date.getSeconds();
+    sec = (sec < 10 ? '0' : '') + sec;
+    var year = date.getFullYear();
+    var month = date.getMonth() + 1;
+    month = (month < 10 ? '0' : '') + month;
+    var day  = date.getDate();
+    day = (day < 10 ? '0' : '') + day;
+
+    return year + '.' + month + '.' + day + '-' + hour + ':' + min + ':' + sec;
+}
+
 // instantiate a new redis client
 // http://www.rediscookbook.org/
 var rediscli = redisdat.createClient();
@@ -96,16 +116,27 @@
       browserv.on('serviceUp', function(service) {
         //console.log('service up: ', service);
         //{interfaceIndex: 2, type: {name: 'ssh', protocol: 'tcp', subtypes: [], fullyQualified: true}, replyDomain: 'local.', flags: 2, name: 'hostname-mich', networkInterface: 'eth0', fullname: 'hostname-mich._ssh._tcp.local.', host: 'hostname-mich.local.', port: 22, addresses: ['192.168.1.50']}
+        rediscli.hget('hostnames', service.host.replace(/\.$/, ''), function (error, value) {
+          // handle unexpected errors
+          if (error) throw(error);
 
-        // insert one or more IP addresses for each hostname.local.
-        rediscli.hset('hostnames', service.host.replace(/\.$/, ''), service.addresses);
+          // insert one or more IP addresses for each hostname.local.
+          if (!value) { // only visit new (or with changed IPs) hosts
+            var rcmulti = rediscli.multi(); // start a new transaction
+            rcmulti.hsetnx('hostnames', service.host.replace(/\.$/, ''), service.addresses, function (error, nret) {
+              if (nret === 1) // database wrote a new entry
+                console.log('    ' + getDateTime() + ' Detected host: ' + service.host.replace(/\.$/, '') + ' ' + service.addresses);
+            }); //rcmulti.hsetnx();
+            rcmulti.exec(); // flush transaction queue
+          }
+        });
       });
       browserv.on('serviceDown', function(service) {
-        console.log('service down: ', service);
+        //console.log('service down: ', service);
         //FIXME: still need to selectively remove hosts
       });
       browserv.on('serviceChanged', function(service) {
-        console.log('service changed: ', service);
+        //console.log('service changed: ', service);
         //FIXME: still need to selectively update hosts
       });
       browserv.start();
@@ -125,6 +156,17 @@
     if (error) throw(error);
 
     if (value) { // the db succeeded in finding a match
+      // FIXME: need to test incoming questions stripping trailing '.'
+      // FIXME: and adding '.local' to handle cases of non FQDNs.
+      // FIXME:   var found; // = {}; doesnt work unfortunately
+      // FIXME:   if (request.question[0].name == host)
+      // FIXME:     found = host;
+      // FIXME:   else if (request.question[0].name + '.local' == host)
+      // FIXME:     found = host.replace(/\.local$/, '');
+      //
+      // FIXME: replace silly new block with simple 'push(nameinst.A)
+      // FIXME: since we already know that the host in question exists
+      //
       // populate the DNS response with the chosen hostname
       rediscli.hkeys('hostnames', function (error, replies) {
           replies.forEach(function (host, index) {