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TL;DR

1. MQTT over websockets.
1. Subscribe to $SYS/#.
1. Hidden topic in one of the sys payloads: "$internal/admin/webcam".
1. Subscribe to hidden topic, dump payload to file.
1. Image contain login details to admin page.

Full writeup: https://github.com/flawwan/CTF-Writeups/blob/master/hxp/time_for_h4x0rpsch0rr.md