/usr/sbin/synce-serial-udev-add is in synce-serial 0.11-5.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh -e
THIS=`basename $0`
# include common stuff
. /usr/share/synce/synce-serial-common
exit_if_not_root
synce_dev_setup "$DEVNAME"
exec $BINDIR/synce-serial-start-device
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