Serial ports?

Installation Home Assistant OS
1

HA OS on a Rpi4:

Is there a limit for the NUMBER of serial ports that will initialize at startup?

I get an effect indicating that only TWO USB-serial ports will startup at any reboot.

I have TWO GPS:es that show up as /dev/ttyUSB0 and /dev/ttyUSB1…
if I unplug one of them I get my ConBee (ZHA) as /dev/ttyACM0

2

Have you checked the output of dmesg when all are plugged in, or when unplugging and plugging the missing device? I don’t think there is a limit to the number of USB or serial ports you can have. You should also use the by-id device string as the tty devices can change positions after a reboot.

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