Add c5 devkit#7

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tyeth wants to merge 26 commits intomainfrom

Commits on Nov 6, 2025

Commits on Nov 7, 2025

Commits on Nov 10, 2025

Mention URL+Port if non-standard. Fix local SSL/TLS MQTT testing
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Commits on Nov 11, 2025

clang format
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Commits on Nov 12, 2025