open_source / mqtt-cpp

deferred_connection

promise is not working because it is reset to null in the connectFailure callback.
removing the set_value() from the connectFailure callback fixed the issue of subscription after promise.

Test:<br>
start mosquitto broker and the publisher test on a remote desktop.<br>
disable the internet connection on the subscribing desktop.<br>
start the subscriber test on the subscribing desktop.<br><br>
<i> at this point, the mqtt client keeps returning to the connectFailure callback </i><br><br>
enable the internet connection again.<br><br>
<i> at this point, the mqtt client returns to the connectSuccess callback. subscriptions are activated and data is coming in.</i>

See merge request !10

…k. removing the set_value() fixed the issue ofsubscription after promise.

added LWT ( last will & testament ) option to mqtt connect.

added support for a last will & testament message. LWT settings are not required for connection, but can be provided as optional parameter when calling the mqttclient connect function. ( see publisher test case ). The parameters to be added are the topic to publish on and the message to be published in case of a connection disruption.

See merge request !8

Fix/pgroen/error handling improvement

Added logging and sensible return points if a problem occurs.
After merge :
* it will be tagged as version 0.9.4
* it will be integrated into the Main IPZC SDK ( Aarch64 ) @ Priva

See merge request !7

Development

See merge request !6

Removed noexcept from using std::function

MQTT-CPP ready for compiling on C++17

See merge request !5

Development

See merge request !4

Development merge to master

See merge request !3

Feat/pgroen/pure virtual public interface

See merge request !2