This was reported by debian lintian checker

Forwarded: https://github.com/eclipse/mosquitto/pull/2846#OpenSigned-off-by: NPhilippe Coval <rzr@users.sf.net>

Closes #1995. Thanks to fyta2000.

Closes #1778. Thanks to jflambert.

This allows the session-expiry-interval property to be easily set for
MQTT v5 clients.

Closes #1526. Thanks to Felix Moessbauer.

Blank lines are sent as empty messages.

Closes #1474. Thanks to majekw.

Also update client documentation about automatic client ids.

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.

Thanks to Erik Moqvist.

Closes #1274.

Add ALPN support for all clients, update documentation, and add to ChangeLog.

Some OpenSSL engines (selectable via tls_engine option) may require a
password to make use of private keys created with them in the first place.

The TPM engine for example, will require a password to access the underlying
TPM's Storage Root Key (SRK), which is the root key of a hierarchy of keys
associated with a TPM; it is generated within a TPM and is a non-migratable
key. Each owned TPM contains a SRK, generated by the TPM at the request
of the Owner. [1]

By default, the engine will prompt the user to introduce the SRK password
before any private keys created with the engine can be used. This could
be inconvenient when running on an unattended system.

Here's where the new tls_engine_kpass_sha option comes in handy. The user
can specify a SHA1 hash of its engine private key password via command
line or config file and it will be passed on to the engine directly.

This commit adds support for both clients (libmosquitto) and broker.

[1] https://goo.gl/qQoXBYSigned-off-by: NNicolás Pernas Maradei <nicopernas@gmail.com>

- Clients can now offload crypto tasks to an external crypto device through
  the OpenSSL ENGINE API.
- The keyfiles can now be treated as PEM or ENGINE keys.
- Two new functions were added to libmosquitto to set up the previously
  mentioned features.
- Both mosquitto_sub and mosquitto_pub include support to turn on the mentioned
  features through command line options.
Signed-off-by: NNicolás Pernas Maradei <nicopernas@gmail.com>

Clients know about v5, just need library support...

Closes #776.

Add option -L to specify user, password, hostname, port and topic at once.
The URL must provided with the -L or --url in the form:
mqtt(s)://[username[:password]@]host[:port]/topic

Change-Id: Ia626a28981a38807a254ae32c6ffb29b122b8a28
Signed-off-by: NMatteo Croce <matteo@openwrt.org>