Function close() from coap is not closing the socket.

I was running an experiment and I found that the function close() from coap was not really closing the socket.

Thereby, I added the following command in the file openwsn/coap/coap/SocketUdpReal.py:
def close(self):

1. declare that this thread has to stop
   self.goOn = False

1. send some dummy value into the socket to trigger a read
   self.socket_handler.sendto( 'stop', ('::1',self.udpPort) )

self.socket_handler.close() #line added

1. wait for this thread to exit
   self.join()

Now it is working.