2018-08-08 21:43:14 +00:00
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.. title: Version 0.8 released
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.. slug: version-0-8-released
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.. date: 2010-08-08 10:31:17
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.. tags: Releases
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.. category:
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.. link:
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.. description:
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.. type: text
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-->
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This is the library release. There are a few bug fixes and changes of behaviour
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for the mosquitto and the clients, but the significant part of this release is
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the new mosquitto MQTT client library. The library comes in three flavours: the
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C library, which is the main library, and C++ and Python bindings. If you're
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interested in helping add bindings for your favourite language, please get in
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touch.
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The library interface (API) is to be considered experimental, although I
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believe the C and C++ APIs to be complete and sane. The Python bindings are a
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naïve attempt by a C programmer and will definitely be changing in the future
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to something more pythonic. I'd be extremely grateful for help from experienced
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python programmers to this end.
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The documentation of the library is currently ongoing... There is an overview
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of most of the function calls and an example in the [libmosquitto.3] man page,
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but complete coverage can be found in the mosquitto.h man page. This, combined
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with the class details in mosquittopp.h can be used to help use the C++
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2020-07-14 15:44:33 +00:00
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library. The python module isn't documented due to its extremely changeable
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2018-08-08 21:43:14 +00:00
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state, but there is an example in the python directory.
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Other changes:
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* Topics starting with a / are treated as distinct to those not starting with
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a /. For example, /topic/path is different to topic/path. This matches the
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behaviour of rsmb.
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* Correctly calculate the will QoS on a new client connection (bug #597451).
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* Add "addresses" configuration file variable as an alias of "address", for
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better rsmb compatibility.
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* Bridge `clean_session` setting is now false, to give more sensible behaviour
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and be more compatible with rsmb.
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* Add `cleansession` variable for configuring bridges.
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* Add `keepalive_interval` variable for bridges.
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* Remove default topic subscription for mosquitto_sub because the old
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behaviour was too confusing.
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* Added a C client library, which the pub and sub clients now use.
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* Added a C++ client library (bound to the C library).
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* Added a Python client library (bound to the C library).
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* Added CMake build scripts to allow the library and clients (not the broker)
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to be compiled natively on Windows.
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Get it from the [download page].
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The change to using a library means that packaging mosquitto for distros is a
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lot more complex. This is stretching my packaging experience, so please bear
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with me on that front! Mosquitto will now likely consist of a number of
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different packages on Ubuntu at least:
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* mosquitto (the broker)
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* mosquitto-clients (mosquitto_sub, mosquitto_pub)
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* libmosquitto0 (C library)
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* libmosquitto0-dev (C library development files)
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* libmosquittopp0 (C++ library)
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* libmosquittopp0-dev (C++ library development files)
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* libmosquitto-python (Python binding)
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# Update
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I've been getting a few questions about the python interface. This isn't
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currently packaged for Ubuntu, but hopefully will be soon. There are basic
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python examples in the downloads at lib/python/sub.py and
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misc/currentcost/gnome-panel/CurrentCostMQTT.py
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[libmosquitto.3]: /man/libmosquitto-3.html
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[download page]: /download
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