Closes #1374. Thanks to Jeff Trull.

Fix usage of tls_engine and tls_keyform.

Add missing EXPOSE instruction to all Dockerfiles

Signed-off-by: Heiko Bornholdt <bornholdt@informatik.uni-hamburg.de>

The current implementation does not properly forward the engine
parameters to OpenSSL causing OpenSSL to incorrectly attempt to open the
engine key uri as a file.

Sponsored-by: Trimble, Inc.
Signed-off-by: Matt Woelfel <matt@woelfware.com>

Closes #1406. Thanks to pbrenna.

Closes #1404. Thanks to Lichard Torman.

Closes #1401. Thanks to Will Lisac.

Reduces the number of "Socket error on client X, disconnecting"
messages.

Closes #1402. Thanks to twegener-embertec.

Closes #737. Thanks to chelliwell.

Closes #478.

Closes #522. Thanks to trinytron.

Closes #448.

Closes #274.

Closes #1390. Thanks to aalibasic.

$HOME/.config/mosquitto_sub or pub?

Remove useless if statement

If statement for detecting if a pointer is NULL
is totally unnecessary.

Signed-off-by: YangHau <vulxj0j8j8@gmail.com>

Should $HOME/.config/mosquitto_sub be $HOME/.config/mosquitto_pub? It seems to be that way based on my testing.

I think this is a copy/paste error.

Closes #1369. Thanks to TimmvonderMehden

These were being treated as a protocol error.

Closes #1367. Thanks to Frank Pagliughi.

Thanks to Greg Troxel.

feat: Remove unecessary if statement

free() would take no action if the arguement is a NULL pointer.
Therefore, the if statement is totally unnecessary.
See ISO-IEC 9899

Signed-off-by: YangHau <vulxj0j8j8@gmail.com>

Closes #1344. Thanks to HowJMay.

Closes #1361. Thanks to Duck Development.

Closes #1362. Thanks to Furkan Aksoy.