After applying the fix in github.com/webadb/webadb., webadb.js is usable for fastboot.
It's a very incomplete implementation compared to the adb support but at least it appears to deal with the protocol framing.
Not going to be as much painful low-level work as I expected for it.
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is that actually needed? AFAIK fastbootd doesn't require a protocol reset and neither should the bootloader impls
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(I ask because I hacked something together using webusb for DFU which *does* requires a USB reset, and on windows, the winusb driver doesn't actually support reset, so the webusb call will always fail)
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It does appear to be needed on Linux, and yeah, it appears to cause problems on Windows. Not sure what we need to do about that.
Maybe the exception just needs to be caught... It definitely doesn't work properly without this on Linux from my testing.