Getting very random results using OneWire on MDBT42Q

The key is to make sure that interrupts are absolutely stopped, including softdevice, during the window.

The problem is that as far as I remember this can potentially break bluetooth and/or trigger a watchdog which will reset the device, which is why it's not done on nRF52 with Bluetooth.

I figured the occasional OneWire error was preferable to the whole device restarting - There was a specific commit to change it some time ago: https://github.com/espruino/Espruino/commit/e8ceb5c61bd145e7a74e92a620f4af1cbb96dd78