This is for mosquitto_sub and mosquitto_rr, to avoid potentially lost
messages.

Closes #2134. Thanks to Frantisek Fuka.

Thanks to Abilio Marques.

Closes #2117. Thanks to David Nadlinger.

Improve handling of invalid combinations of listener address and bind
interface configurations. Closes #2081.

Closes #2032.

Merge branch 'fix_interface_binding' of git://github.com/mosterdt/mosquitto into mosterdt-fix_interface_binding

Closes #2130. Thanks to becz.

Closes #2123. Thanks to quackgizmo.

Closes #2111. Thanks to yellowgg2.

It was setting the exact TLS version to use, not the minimium TLS
version to use.

Closes #2110. Thanks to Petter Jönsson.

Remove use of environment variable, instruct users to run a specific
command instead.

Signed-off-by: Abilio Marques <abiliojr@gmail.com>

Closes #2096. Thanks to blusewang.

Provide a mechanism for Docker users to run a broker that doesn't use
authentication, without having to provide their own configuration file.

Closes #2040.

Signed-off-by: Vidar Madsen <vidarino@gmail.com>

Signed-off-by: Vidar Madsen <vidarino@gmail.com>

The would not return MOSQ_ERR_INVAL on topic == NULL.

If it is compiled without external poll support.

Closes #2060. Thanks to Yannic Schröder.

Signed-off-by: Thomas De Backer <mosterdt@debacker.me>

Signed-off-by: Thomas De Backer <mosterdt@debacker.me>

Closes #2078. Thanks to Ysincit.