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Post for: #IoT (2 Posts)

Insights, tutorials, and real-world use cases from my work in the Internet of Things – from smart sensors to cloud integration and practical deployment tips.

Building a Secure PKI for MQTT using OpenSSL: Root CA, Intermediate CA, and Server Certificates

3 February 2026 Johannes Kinzig
IoT Linux macOS Software Engineering
Designing a Modern PKI for MQTT with OpenSSL (EC, RSA, and Certificate Chains)

Transport security is a fundamental requirement for any MQTT-based system, especially in IoT and industrial environments where devices often operate unattended and over public networks.

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TBRESTClientLib – A ThingsBoard API Client written in Swift

26 February 2025 Johannes Kinzig
IoT My Libs Open Source Projects Software Engineering
TBRESTClientLib – an abstract picture showing computers, smartphones, tablet PCs and smart devices being interconnected

Implementation of ThingsBoard’s ReST client API – written in Swift: When developing IoT and IIoT solutions, having a reliable IoT platform is crucial. For both…

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