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Things seemed promising enough at first, although the bulbs were alarmingly heavy (there's a significant chunk of heatsink built into them, which seems to get a lot warmer than I'd expect from something that claims a 7W power consumption). The app was a bit clunky, but eh - I wasn't planning on using it for long. I pressed the button on the bridge, launched the app and could control the bulbs. The first thing I
noticed was that they had a separate "white" and "colour" mode. White mode was pretty bright, but colour mode massively less so - presumably the white LEDs are entirely independent of the RGB ones, and much higher intensity. Still, potentially useful as mood lighting. Anyway. Next step was to start playing with the protocol, which meant finding the device on my network. I checked anything that had picked up a

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DHCP lease recently and nmapped them. The OS detection reported Linux, which wasn't hugely surprising - there was no GPL notice or source code included with the box, but I'm way past the point of shock at that. It also reported that there was a telnet daemon running. I connected and got a login prompt. And then I typed admin as the username and admin as the password and got a root prompt. So, there's that. The copy of Busybox included even came with tftp, so it was easy to get copies of tcpdump and strace on there to see what was up. So. Next step. Protocol sniffing. I wanted to know how discovery worked, so reset the device to factory and watched what happens. The app on my phone sent out a discovery packet on UDP port 18602 which looked like this: 

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INLAN:CLIP:23.21.212.48:CLPT:22345:MAC:02:00:00:00:00:00 The CLIP and CLPT fields refer to the cloud server that allows for management when you're not on the local network. The mac field contains an utterly fake address. If you send out a discovery packet and your mac hasn't been registered with the device, you get a denial back. If your mac has been (and by "mac" here I mean "utterly fake mac that's the same for all devices"), you get back a response including the device serial number and IP address. And if you just leave out the mac field entirely, you get back a response no matter whether your address is registered or not. So, that's a start. Once you've registered one copy of the app with the device, anything can communicate with it by just using the same fake mac in the discovery packets. ちびまる子ちゃん0547

Onwards. The command format turns out to be simple. They start ##, are followed by two ascii digits encoding a command, four ascii digits containing a bulb id, two ascii digits containing the number of following bytes and then the command data (in ascii). An example is: