Closes #2089. Thanks to YerayAlonso.

Closes #2098.

Closes #2136. Thanks to chuckunix.

CVE-xxxx-xxxx: If an authenticated client connected with MQTT v5 sent a
malformed CONNACK message to the broker a NULL pointer dereference occurred,
most likely resulting in a segfault. This will be updated with the CVE
number when it is assigned.
Affects versions 2.0.0 to 2.0.9 inclusive.

Closes #2163. Thanks to Bryan Pearson.

This would occur if a client was using `mosquitto_loop_start()`, then if
the connection failed due to the remote server being inaccessible they
called `mosquitto_loop_stop(, true)` and recreated the mosquitto object.

See: https://www.eclipse.org/forums/index.php?t=rview&goto=1839865#msg_1839865

Closes #2160. Thanks to Ozaq.

Closes #2152. Thanks to jetpax.

Fully empty sockpairR on interruptible_sleep

fix duplication of messages during connect

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

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

This is for when it takes over an old session.

Closes #2134. Thanks to Frantisek Fuka.

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.