Closes #2463. Thanks to Tim Nordell.

Closes #2471. Thanks to Vitaljok and rillbert

Closes #2489. Thanks to rroguski

This is for when a client session is taken over.

Closes #2607. Thanks to der-b

Closes #2594.
Closes #2595.

Closes #2448. Thanks to Antoine.

Closes #2561.

Closes #2564. Thanks to nmeum.

Closes #2589. Thanks to Dirk Feytons.

This is for incoming messages.

Closes #2593. Thanks to dongguoqing2015.

Thanks to minfrin

This is for messages to the local broker if the remote bridge connection
fails.

Closes #1488.
Closes #2467.

Closes #2546. Thanks to Joachim Schachermayer.

Closes #2404. Thanks to Rainer Plischke.

This check is not required until v3.1.1.

Closes #2522. Thanks to garinocyr

This was due to the openssl ctx not being initialised until starting to connect.

Closes #2537. Thanks to chessing-c4.

Merge branch 'fix_msg_modification_leak' of https://github.com/abiliojr/mosquitto into abiliojr-fix_msg_modification_leak

See https://github.com/eclipse/mosquitto/pull/2500

fix data race mosquitto_loop function

Fix mosquitto_pub incorrectly reusing topic aliases when reconnecting.

Closes #2494.

Don't reuse topic alias after reconnect.

next_msg_out must be protected with the msgtime_mutex
as done everywhere else in the code else there is a data race
e.g. if mosquitto_publish is called from another thread

Signed-off-by: Christian Salvasohn <csalvasohn@gmx.de>

CMake: Use PROJECT_SOURCE_DIR to improve using mosquitto as subdirectory

When mosquitto is included as subdirectory, `CMAKE_SOURCE_DIR` does not refer to the mosquitto top level CMake file, but to the whole project top level CMake.
Use `PROJECT_SOURCE_DIR` instead to refer to the right CMake in both contextes.

Signed-off-by: Pierre Hallot <hallotpierre@gmail.com>

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

Requires cmake 3.1.

Fix constant restart_timeout

Closes #2401. Thanks to Diorcet Yann.