Fractional CTO and engineering lead. I help startups and scaleups move faster and get to revenue. Technical writing on the things I build.https://seanrleach.co.uk/https://seanrleach.co.uk/posts/decoding-a-hot-tub/https://seanrleach.co.uk/posts/decoding-a-hot-tub/The encryption on a Jacuzzi J235's control bus is one random byte and a fixed key stream. How I worked that out, with a decoder that runs in your browser.Mon, 09 Nov 2026 12:00:00 GMThttps://seanrleach.co.uk/posts/can-bus-hacking/https://seanrleach.co.uk/posts/can-bus-hacking/Using an ESP32 on a BMW F30's CAN bus to make steering wheel controls work with an aftermarket head unit.Tue, 15 Aug 2023 22:54:12 GMT