After spending a bit more (too much!) time on this in
#homeassistant, I'm really irritated by the fact that I can't figure out why
#DeCONZ (from its container) can use the
#Raspbee whereas
#ZHA fails in two different ways for both /dev/ttyAMA0 ("Failed to connect" after a while) and /dev/ttyS0 ("Failed to connect" immediately). The DeCONZ-container has an additional /sys/class/gpio-bind-section, so I'm wondering if they know/try something that ZHA doesn't?