Also fix bridge connection not relinquishing POLLOUT after messages are
sent.

Closes #1977. Thanks to marchaesen.
Closes #1979. Thanks to GorazdKikelj.

Closes #1975. Thanks to Jinming Chen.

  Closes #1934. Thanks to sectokia and jarapa9.

Fix return code on callback unregister.

Closes #1962. Thanks to martgeier.

Closes #1969. Thanks to phplpf.

mosquitto_connect_bind_async() and mosquitto_connect_bind_v5() should not
reset the bind address option if called with bind_address == NULL.

Otherwise calling mosquitto_connect_async() will *force* the bind
address to be reset, even if previously set with
mosquitto_string_option().

Closes #1968. Thanks to promahn.

Use libdir as the install prefix for plugins

Closes #1963. Thanks to twegener-embertec.

Use the libdir variable from config.mk just like lib/ uses to ensure
that the plugins are installed into the same location as the library.
This fixes systems that use lib64 for libraries like most 64 bit
Linux distributions.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>

Fix issue with CMAKE_MODULE_PATH

Closes #1942. Thanks to charlemagnelasse.

Closes #1956. Thanks to nduhme.

Closes #1960. Thanks to twegener-embertec.

This occured if a successful connection was not made.

Closes #1957. Thanks to Peoh.

Systemd service changes for updated pid path

Signed-off-by: Peter Stevenson <pete@ihut.co.uk>

The code would simply append the folder with no separator, resulting in an invalid path if the variable was not empty.
Now properly append it.

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

https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html


"Note Call the cmake_minimum_required() command at the beginning of the top-level CMakeLists.txt file even before calling the project() command. It is important to establish version and policy settings before invoking other commands whose behavior they may affect."

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

According to this from the mailing list, it is no longer required since the minimum cmake required is 3.0.

https://cmake.org/pipermail/cmake/2014-July/058048.html


"The code that emits the warning is run by "project()". Since you do not have an explicit project() call in your top-level CMakeLists.txt CMake adds one to the top implicitly. [1]
A project file that explicitly calls project() after requiring CMake >= 2.8.4 should make the warning go away."

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

This was not happening for the case when the existing session wasn't
being continued.

Closes #1946. Thanks to Rory Piper.

Closes #1945. Thanks to Andreas Schildbach.

Only applies if if `-c` is not also used.

Closes #1949. Thanks to J. Augusto de Oliveira.

Closes #1947. Thanks to Patrick TJ McPhee.

Closes #1938. Thanks to apple3306 and JulianCaruso.