That's really strange - looks like the version of Web Bluetooth you've got there is missing a field that's in all the other implementations :( Odd, as I have had it working on Android 5 (it must have been an update in Chrome)
Luckily it's only for a debug message. I'll make an update in the next hour or so - it should get you past that problem at least.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
That's really strange - looks like the version of Web Bluetooth you've got there is missing a field that's in all the other implementations :( Odd, as I have had it working on Android 5 (it must have been an update in Chrome)
Luckily it's only for a debug message. I'll make an update in the next hour or so - it should get you past that problem at least.