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I don't like the fact, that on most systems
systemctl status
showsthe state as degraded and that we have irrelevant entries in the journal,
just because we don't have a functioning ttyS1 available.
Regard serial.log@ as a "best effort" service, which continuously tries
to work with the device and just waits a bit on failure.
Use an external command for the loop instead of abusing the service
restart feature of systemd for that.