Yes, someone could have a local hostname of "node". <sigh>

This solves the problem of subscribing to "sbbs/+/+/+" and getting node status in addition to server status (very different formatted messages).

Also include a change for the singular-again "node" topic

If a configuration had *no* command shells, this would have caused a crash here in SCFG.

Also, when selecting the new user command shell, default to the current selection.

Should fix the segfault reported by NeoArata_ in #synchronet

Also include singular/plural error/s in server status messages.

<server>/state is now published directly to the <sever> topic level (the "state" topic goes away).

Moved <bbs-id>/node# topics to <bbs-id>/nodes/# (allows better wild-card subscription per MQTT standards).
Publishing total node count to <bbs-id>/nodes rather than <bbs-id>/node_count

Introduced "publish verbosity" control (defaults to "High") - if you want nice human readable (and sometimes redundant) topic messages, leave this set to "High". To reduce traffic, set to "Low". It's expected that purpose-built Synchronet/MQTT clients should work equally-well with either setting, but when using generic MQTT clients/browser, "high" verbosity is nice. The human-readable node status is only published when "high" verbosity is enabled.

Publishing the BBS name to the <bbs-id> topic, the instance hostname (as configured in sbbs.ini) to the <host> topic. Makes the hierarchy much more clear when using an MQTT browser like MQTT Explorer.

This is more consistent with how these events are logged in a BBS-common log file in data/*.log.

This change also restores the server abbreviation to the error log entries that used to be there until recently.

Makes for a nice node listing with pure-text MQTT clients/tools

Each Synchronet server is now its own MQTT client. This means there's no
longer any MQTT logic in the Synchronet "hosts" (e.g. sbbscon.c, ctrl/*.cpp)
and none needed for SBBS NT services (they'll "just work" with MQTT).

This also means that just about everything (except for nodes, spam and hack)
is now published per-server (in the sbbs/BBS-ID/hostname/server/ topic branch)
and if you want aggregated totals or client lists, you'll have to do that in
your own MQTT client or dashboard.

I also removed the publishing of thread_count and socket_count topics as
they weren't universally supported across all servers and are of questionable
value. They can be added back later if determined to be useful.

A set_state() may be called with SERVER_STOPPED while recycling.

any server "running" is not enough because the server could still be
initializing, re-initializing, or even shutting down.

Aripoll auth wtf

See merge request !238

Technically, the OpenSSL DLLs aren't used right now because I have TLS support
disabled in the 'develop' branch version of mosquitto.dll v2.1.0 that I have
in the repo, but that should soon change.

Fixes issue #476

This solves the problem of any signal (even HUP) ungracefully terminating
sbbs (on *nix) when MQTT was enabled. As reported by Nightfox on IRC.

Should fix the new crash issues reported by Retros via #synchronet on irc.synchro.net

Update brace style and header comment while at it.

warning: passing argument 2 of ‘mosquitto_message_callback_set’ from incompatible pointer type

Interestingly, not required for successful MSVC build. <shurg>

I suspecte the circular dependency and include-guards around mqtt.h
and startup.h were going to be a problem.

Now support subscriptions (e.g. recycle topics, node input topics) in SBBSCTRL.
This required a lot of search/replace and fun with circular struct pointers.

Doing this via manual edits to this bpr file don't seem to work.

Fix issue #470 reported via IRC: timed event "mdays" values were read and written as 16-bit values, meaning any setting for days > 15 would do weird things.

The only difference in the data/scheme is that the "error" topic (error log) is now under each server rather than each host. I don't *think* there are any other changes from the MQTT consumer side.

Still not done: subscribing (e.g. support for recycle or node-spy-input via MQTT) and NT services support.

This change also includes a cool feature that will prompt the sysop if there's a timeout (30 seconds) while waiting for servers to shutdown gracefully and giving the sysop the option to abort (Cancel) the wait (and shutdown ungracefully) or continue the wait (OK).

And export a simple ver() function to be used in MainFormUnit.cpp (for mqtt stuff)

e.g. sbbs.dll

Turned of "Use dynamic RTL" and "Build with runtime packages" under
Project options.

This should resolve the UserEdit.exe runtime issue reported by Diamond Dave
via DOVE-Net.