TLS bridge reconnecting very slowly on Windows

[jsirpoma]

This is very similar to issue #154 but still happens on 1.4.14. The bridge makes TLS connection.

This log is from starting mosquitto, stopping wifi and putting it back on immediately.

1517575981: mosquitto version 1.4.14 (build date 11/07/2017  0:03:18.53) starting
1517575981: Config loaded from ./mosquitto-cmd.conf.
1517575981: Opening ipv6 listen socket on port 1883.
1517575981: Opening ipv4 listen socket on port 1883.
1517575981: Bridge XXX doing local SUBSCRIBE on topic y/#
1517575981: Connecting bridge XXX (XXX:YYY)
1517575981: Bridge XXX sending CONNECT
1517575982: Received CONNACK on connection XXX.
1517575982: Bridge XXX sending UNSUBSCRIBE (Mid: 12339, Topic: x/y/#)
1517575982: Received PUBACK from XXX (Mid: 12338)
1517575982: Received UNSUBACK from XXX
1517575991: Socket error on client XXX, disconnecting.
1517576021: Bridge XXX doing local SUBSCRIBE on topic y/#
1517576021: Connecting bridge XXX (XXX:YYY)
1517576021: Bridge XXX sending CONNECT
1517576021: Error creating bridge: Unknown error.
...
Repeats the last four lines for 10 minutes
...
1517576641: Bridge XXX sending CONNECT
1517576641: Received CONNACK on connection XXX.

I am not really familiar with mosquitto networking code, but it looked like this to me:

• mosquitto_net_write returns -1 and sets errno to EAGAIN
• mosquitto_packet_write sets errno to WSAGetLastError and does not understand it
• mosquitto_packet_write returns MOSQ_ERR_ERRNO and errno is set to the unknown value
• The same MOSQ_ERR_ERRNO is returned to mosquitto_packet_queue and to mqtt3_bridge_connect
• Error is reported and socket closed

So maybe the EAGAIN from mosquitto_net_write should be interpretted like that as the connection is not yet ready?

[jsirpoma]

This is the same as #478 and the fix in #478 (comment) solves this.