This is a bugfix release.
- Fix incorrect bridge notification on initial connection. Closes #467096.
- Build fixes for OpenBSD.
- Fix incorrect behaviour for autosave_interval, most noticable for autosave_interval=1. Closes #465438.
- Fix handling of outgoing QoS>0 messages for bridges that could not be sent because the bridge connection was down.
- Free unused topic tree elements. Closes #468987.
- Fix some potential memory leaks. Closes #470253.
- Fix potential crash on libwebsockets error.
- Add missing error strings to mosquitto_strerror.
- Handle fragmented TLS packets without a delay. Closes #470660.
- Fix incorrect loop timeout being chosen when using threaded interface and keepalive = 0. Closes #471334.
- Increment inflight messages count correctly. Closes #474935.
- Report error string on connection failure rather than error code.