proto, dummy, self.broker = self.broker.split("/", 2)

self.broker gets modified during connect, however if you do a reconnect, it tries to parse broker again, however broker was already parsed down (removed the photo, and path). the split fails as broker only contains the host address and there are not enough values to unpack. I would have done a request for pull on this, but didn't know how you wanted to handle this situation.

my broker was set to: http://10.0.0.16