update DPD signature for bacnet to that suggested by @keithjjones in cisagov/icsnpp-bacnet#21. he states 'This provides a DPD signature for Bacnet. I've been running this on several live networks for many months and have been happy with the results. It has uncovered several Bacnet networks I did not know about on non standard ports, which is pretty common for this protocol.'
update DPD signature for bacnet to that suggested by @keithjjones in cisagov/icsnpp-bacnet#21. he states 'This provides a DPD signature for Bacnet. I've been running this on several live networks for many months and have been happy with the results. It has uncovered several Bacnet networks I did not know about on non standard ports, which is pretty common for this protocol.'
resolves cisagov/icsnpp-bacnet#21