Eclipse Mosquitto™ 1.6.11

Security:

- On Windows the Mosquitto service was being installed without appropriate

 path quoting, this has been fixed.



Broker:

- Fix usage message only mentioning v3.1.1. Closes #1713.

- Fix broker refusing to start if only websockets listeners were defined.

 Closes #1740.

- Change systemd unit files to create /var/log/mosquitto before starting.

 Closes #821.

- Don't quit with an error if opening the log file isn't possible.

 Closes #821.

- Fix bridge topic remapping when using "" as the topic. Closes #1749.

- Fix messages being queued for disconnected bridges when clean start was

 set to true. Closes #1729.

- Fix `autosave_interval` not being triggered by messages being delivered.

 Closes #1726.

- Fix websockets clients sometimes not being disconnected promptly.

 Closes #1718.

- Fix "slow" file based logging by switching to line based buffering.

 Closes #1689. Closes #1741.

- Log protocol error message where appropriate from a bad UNSUBSCRIBE, rather

 than the generic "socket error".

- Don't try to start DLT logging if DLT unavailable, to avoid a long delay

 when shutting down the broker. Closes #1735.

- Fix potential memory leaks. Closes #1773. Closes #1774.

- Fix clients not receiving messages after a previous client with the same

 client ID and positive will delay interval quit. Closes #1752.

- Fix overly broad HAVE_PTHREAD_CANCEL compile guard. Closes #1547.



Client library:

- Improved documentation around connect callback return codes. Close #1730.

- Fix `mosquitto_publish*()` no longer returning `MOSQ_ERR_NO_CONN` when not

 connected. Closes #1725.

- `mosquitto_loop_start()` now sets a thread name on Linux, FreeBSD, NetBSD,

 and OpenBSD. Closes #1777.

- Fix `mosquitto_loop_stop()` not stopping on Windows. Closes #1748. Closes #117.