From 2b35a2caeb3055fdaec9cc5a7519445b7da84d51 Mon Sep 17 00:00:00 2001
From: James Page <james.page@ubuntu.com>
Date: Thu, 12 Jul 2012 10:08:37 +0100
Subject: [PATCH] Override remote controller check to ensure that remote
 controller is contactable

---
 mininet/node.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mininet/node.py b/mininet/node.py
index b441d96..d201dff 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -1073,3 +1073,12 @@ class RemoteController( Controller ):
     def stop( self ):
         "Overridden to do nothing."
         return
+
+    def checkListening( self ):
+        "Ensure that the remote controller is accessible"
+        listening = self.cmd( "echo A | telnet -e A %s %d" %
+                              ( self.ip, self.port ) )
+        if 'Unable' in listening:
+            raise Exception( "Unable to contact the remote controller"
+                             " at %s:%d\n" % (self.ip, self.port))
+