I Stripped Away the Vendor Software and Hand-Crafted 5 Industrial Handshakes From Scratch

By RUGERO Tesla (@404Saint). A few weeks back, I wrote an article about how easy it is to take control of an unauthenticated PLC if you have network access. But pointing a script at a port and watching a variable change is only step one. It doesn’t tell you how the communication actually functions when it hits the wire. If you read standard OT security textbooks, they give you high-level theoretical overviews. If you look at vendor documentation, they hide everything inside closed-source graphical interfaces. I got tired of the abstraction. I wanted to see the raw bytes. So, I built a lab environment called raw-industrial-protocols using nothing but lightweight Python socket twins running over a local Linux loopback interface. No heavy simulators. No proprietary vendor suites. Just standard network sockets injecting raw hex streams directly onto the wire to mimic, capture, and dissect the exact binary handshakes used by the critical infrastructure powering our world. This is Lay