paho-mqtt-c from home:czanik:syslog-ng40 project
Select Your Operating System
Add repository and install manually
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:czanik:syslog-ng40/15.4/home:czanik:syslog-ng40.repo zypper refresh zypper install paho-mqtt-c