atsha204a driver appear unstable on ESP boards.

[fallberg]

The security personalizer fails on ESP8266 boards.
The cause might be (yet to be confirmed) the WiFi interrupts, which may interfere with the bitbanged single wire driver.
A possible solution might be to execute the low level I/O primitives in the atsha driver in critical sections.

[kvoit]

I have put ATSHA204 on my list of things I will order from a reputable sender as soon as I have enough together to avoid shipping (if anyone is up for a joint Mouser/Digikey... order in Germany ...)
Don't though time at this just because of my bug report, and then it turns out that the Chinese send me rubbish.