docs: def send_private_message(self, user_id, message):
          """
          Send a message to a specific client.
          Returns True if successful, False otherwise
          """
          try:
              client = self.channels['private'][str(user_id)]
          except KeyError:
              print '====debug===='
              print self.channels['private']
              print 'client with id %s not found' % user_id
              return False
          
          client.send_message(message)
          print 'message sent to client #%s' % user_id
          return True