Client hangs on retry

[mcuadros]

The reconnect clients hang on reconnect when it resubscribing to a topic even if is QoS0:

mqtt-go/retryclient.go

Line 47 in 78fc549

ResponseTimeout time.Duration

It doesn't have any default value and it's used on the subscription to the topics: https://github.com/at-wat/mqtt-go/blob/master/retryclient.go#L361

So sorry but I don't have any sample code but till I configured the ResponseTimeout, my project was hanging after a few hours of working. Since I set up the timeout it's not happing anymore.