Network not connecting on Windows

[albertnis]

On Windows, the client reconnects many times very quickly, then the program exits.

[albertnis]

Error is as follows. Client disconnects upon subscription.

2020/05/16 17:40:03 Connecting to client XXX:1883... 
2020/05/16 17:40:04 Client connected
2020/05/16 17:40:10 Subscribing to topic XXX... 
2020/05/16 17:40:37 Client connection lost unexpectedly
2020/05/16 17:40:39 Client connected
2020/05/16 17:40:47 Subscribing to topic XXX... 
2020/05/16 17:40:47 write tcp XXX:54636->XXX:1883: use of closed network connection

[albertnis]

This was due to using a duplicate client ID. This appears to be an issue even when the original client (the one being duplicated) isn't actively connected to the broker. The closest a fix is to do the following:

• Add to the disconnection error message stating this may be caused by a duplicate client ID
• Remove the default for the client ID parameter