The difference of bt_socket.bind

[aptc]

Suppose I want to receive files forever, this is the test program:

while 1:
  bt_socket=socket()
  bt_socket.bind(("",9))   
  advertise("Boobee Here!", bt_socket, OBEX)
  obex.recvfile(bt_socket, "test.txt")
  bt_socket.close()

When i specified the bluetooth adapter's address like this:
while 1:
  bt_socket=socket()
  bt_socket.bind(("00:0A:3A:7A:70:BB",9))
  advertise("Boobee Here!", bt_socket, OBEX)
  obex.recvfile(bt_socket, "test.txt")
  bt_socket.close()

something like this would happan:

Traceback (most recent call last):
  File "test.py", line 5, in <module>
    bt_socket.bind(("00:0A:3A:7A:70:BB",9))
  File "<string>", line 5, in bind
socket.error: (98, 'Address already in use')

[blam]

You mean if you get this error if you specify the adapter address instead of just using "" when calling bind()? I can't reproduce this myself. There should be no problem with providing the adapter address to bind().

[aptc]

Yes, that's what I mean. It's all right when you run the program once, everything is ok, but problem shows up at second round when you specify the adapter address.

[aptc]

Ok, it's my fault, I figured out the problem myself, thank you.