[vz-dev] [volkszaehler/vzlogger] 48cd57: First version of mqtt support. (#357)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/volkszaehler/vzlogger
  Commit: 48cd5773a8188ee53ee8380bd979b974e9c12daf
      https://github.com/volkszaehler/vzlogger/commit/48cd5773a8188ee53ee8380bd979b974e9c12daf
  Author: Matthias Behr <mbehr at mcbehr.de>
  Date:   2018-12-31 (Mon, 31 Dec 2018)

  Changed paths:
    M .travis.yml
    M CMakeLists.txt
    M README.md
    M config.hpp.in
    M etc/vzlogger.conf
    M include/Buffer.hpp
    M include/Channel.hpp
    A include/mqtt.hpp
    M src/CMakeLists.txt
    M src/Config_Options.cpp
    A src/mqtt.cpp
    M src/threads.cpp
    M src/vzlogger.cpp
    M tests/CMakeLists.txt
    M tests/mocks/CMakeLists.txt

  Log Message:
  -----------
  First version of mqtt support. (#357)

* Cmake, readme, config changes to add libmosquitto.

* First version of mqtt client support.
Adds
- ENABLE_MQTT cmake option. Defaults to On but turns off automatically
  if libmosquitto not found.
- basic mqtt client support using libmosquitto
  - topics generated are:
    vzlogger/<channel-id>/uuid
    vzlogger/<channel-id>/raw
    vzlogger/<channel-id>/agg
- added config options for
  - host
  - port (currently no tls/sll support!)
  - user
  - password
  - topic (prefix used instead of vzlogger in above example)
  - (some more, see etc/vzlogger.conf)
- agg values get's preferred instead of raw. Using config option
  rawAndAgg this can be changed.

* adding libmosquitto-dev to travis-ci

* tell libmosquitto to be thread safe

* Add tls/cert support for MQTT

* Add id with "unparse" name of channel as well to the topic.
This should be to get a better understanding of what the channel
actually is. E.g. will contains obis ids.

* added reconnect handling if con. refused at startup
This should allow startups where the mqtt server will be available later

* Added a lock to protect chMap incase of multiple meters.

* announce uuid only if not empty



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