start mqtt client (based on paho.mqtt.c), basically works

3rd/paho.mqtt.c/SECURITY.md

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+# Security Policy
+
+This project follows the [Eclipse Vulnerability Reporting Policy](https://www.eclipse.org/security/policy.php).
+Vulnerabilities are tracked by the Eclipse security team, in cooperation with the project lead.
+Fixing vulnerabilities is taken care of by the project committers, with assistance and guidance of the security
+team.
+
+## Supported Versions
+
+Eclipse Paho provides security updates for the most recent version only.
+
+## Reporting a Vulnerability
+
+We recommend that in case of suspected vulnerabilities you do not create a GitHub issue, but instead contact the
+Eclipse Security Team directly sending an email to security@eclipse.org.
+