add error/timeout tracing for nodeSP

lib/nodes/nodeSP.js

@@ -38,6 +38,24 @@ SP.prototype.connect = function(){
     , client = me.socket = new net.Socket()
     , bound = false
     ;
+
+  client.on('close', function(){
+    me.linkStatus = false;
+    console.log('SMG server close');
+  });
+  client.on('end', function(){
+    me.linkStatus = false;
+    console.log('SMG server end');
+  });
+  client.on('error', function(){
+    console.log('SMG connection has error!');
+    console.log(me);
+  });
+  client.on('timeout', function(){
+    console.log('SMG connection has timeout!');
+  });
+
+  console.log('try to connect to SMG with %s:%s', me.SMGHost, me.SMGPort);
   client.connect(me.SMGPort, me.SMGHost, function(){
     console.log('SMG connected');
     var bind = new Bind(1, me.SMGUser, me.SMGPass);
@@ -67,15 +85,6 @@ SP.prototype.connect = function(){
         }
       }
     });
-
-    client.on('close', function(){
-      this.linkStatus = false;
-      console.log('SMG server close');
-    });
-    client.on('end', function(){
-      this.linkStatus = false;
-      console.log('SMG server end');
-    });
   });
 };