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It's not just routers https://www.bbc.co.uk/news/technology-56996717 As more and more devices are connected to the Internet firmware upgrades need to be done. Sia updates all firmwares on supported systems as released if required. Whats the thoughts on auto firmware updates and what about the systems without support contracts in place?

Nobody else was

Id was/is clever but basic and doesn't handle any interference. It not data as such In 100ms the panel would pulse between 2.85v to 6.5v 1 pulse for biscuit 1 10 pulses for biscuit 10 and so on. Each biscuit counts the pulses and draws a different current if open or closed after its pulse count has occured After all 30 have done this the panel rises the line to 11.25v which resets the counters and tells the biscuits to start counting again. All in 100ms. If a biscuit reports open for 3 scans (300ms) the panel then reports alarm. Later panel had this programmable though You can imagine how any sort of interference would cock up this scanning

just think - zombie arf !