Duplicate mqtt-client-id's

[yodalived]

qt-openzwave/qt-ozwdaemon/mqttpublisher.cpp

Line 63 in 7ebd43e

this->m_client->setClientId(QString("qt-openzwave-%1").arg(settings->value("Instance", 1).toInt()));

This line creates an mqtt client id of "qt-openzwave-0". If you have installations across multiple machines, their mqtt-client-id will be duplicated on the MQTT server. Since an MQTT server can only have unique client-id's, the older connection gets kicked off. In my instance, I have a two instances running in Docker connecting to the same MQTT server, both trying to connect with the same client id.

1616742757: New client connected from 192.168.105.219:45764 as qt-openzwave-0 (p2, c1, k60).
1616742765: New connection from 172.18.0.1:50662 on port 1883.
1616742765: Client closed its connection.
1616742765: New connection from 172.18.0.1:50666 on port 1883.
1616742765: Client qt-openzwave-0 already connected, closing old connection.

Can this be changed so that there is a short random number instead of 0 to allow multiple instances to connect to a single MQTT server?