Use arping utility to check for presence of device.

Bryan 28acb73969 initial commit		2020-12-27 00:43:55 -06:00
arp-check.sh	initial commit	2020-12-27 00:43:55 -06:00
arp-checkv2.sh	initial commit	2020-12-27 00:43:55 -06:00
arp-timing.sh	initial commit	2020-12-27 00:43:55 -06:00