Ben's notes

cd /etc/udev/rules.d/
cat hopf.rules
KERNEL=="ttyS0", SYMLINK+="hopfclock0"
KERNEL=="ttyS0", RUN+="/bin/setserial -v /dev/%k low_latency"
KERNEL=="rtc", OWNER="root", GROUP="tty", MODE="0664"

cat pps.rules
KERNEL=="ttyS0", SYMLINK+="gps0"
KERNEL=="ttyS0", RUN+="/bin/setserial -v /dev/%k low_latency"
KERNEL=="ttyS0", RUN+="/usr/sbin/ldattach pps /dev/%k"
KERNEL=="pps0", OWNER="root", GROUP="tty", MODE="0660", SYMLINK+="gpspps0"
KERNEL=="rtc", OWNER="root", GROUP="tty", MODE="0664"

(apt-get remove ntp)

cd /root
apt-get install dpkg-dev dialog devscripts fakeroot pps-utils
  
apt-get source ntp && apt-get build-dep ntp
  
cd ntp<directory>
  
debuild -us -uc
  
dpkg --install ntp....deb

• Allow write to drift file, edit /etc/default/voyage-util.

  VOYAGE_SYNC_DIRS="var/lib/ntp"

• Set hwclock, edit /etc/default/hwclock.

  HCTOSYS_DEVICE=rtc

• Load module rtc.

  #vi /etc/modules
  rtc

• Configure locale.

  apt-get install locales
  dpkg-reconfigure locales

• Run the ntpd at the highest priority.

  vi /etc/default/ntp
  
  NTPD_OPTS='-g -N'

#Stratum level when no ref source available
tos orphan 12

# Hopf DCF clock
server 127.127.8.0	mode 12 minpoll 4 maxpoll 4
fudge  127.127.8.0      time1 0.001200  # calibration
fudge  127.127.8.0	flag1 1 	# Time2 = Trust time
fudge  127.127.8.0	time2 3600	# Trust time

leapfile /etc/leap_second

restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery
restrict 127.0.0.1
restrict ::1

statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

driftfile /var/lib/ntp/ntp.drift

#!/bin/bash
#
# Tested with Hopf 7001 DCF Base station with 7245 serial interface boards
# Datastring 7001/6021
#
# Ben Stienstra, 2013/05

ntpq="/usr/bin/ntpq"

# get timecode variable, received from the clock
eval `$ntpq -c 'cv 0 timecode'`

function quit {
	case "$2" in
	0)	echo "OK: $1"
		exit 0
		;;
	1)	echo "Warning: $1"
		exit 1
		;;
	2)	echo "Critical: $1"
		exit 2
		;;
	3)	echo "Unknown: $1"
		exit 3
		;;
	esac
}

function clockstat {
	# Status nibble from hex
	hex0=0000
	hex1=0001
	hex2=0010
	hex3=0011
	hex4=0100
	hex5=0101
	hex6=0110
	hex7=0111
	hex8=1000
	hex9=1001
	hexA=1010
	hexB=1011
	hexC=1100
	hexD=1101
	hexE=1110
	hexF=1111

	eval statnibble='hex$1'
	snibble=${!statnibble}

	case ${snibble:0:2} in
	00)
		textstatus="time/date invalid"
		exitcode=2
		;;
	01)
		textstatus="crystal operation"
		exitcode=1
		;;
        10)
                textstatus="radio operation"
		exitcode=0
		;;
	11)
		textstatus="radio operation (high accuracy)"
		exitcode=0
		;;
	esac

	case ${snibble:2:1} in
	0)
		dss="standard time"
		;;
	1)
		dss="daylight saving time"
		;;
	esac

        case ${snibble:3:1} in
        0)
                ann="no announcement hour"
                ;;
        1)
                ann="announcement (ds-st-ds)"
                ;;
        esac

	quit "status hex=\"$1\", bin=\"$snibble\": $textstatus, $dss, $ann" $exitcode
}


# check for complete string, for example: \x028D194223310513\x0a\x0d\x03
# This is from the Hopf 7245 serial interface board
#
# x20 = Space
# x0D = CR (carriage return)
# x0A = LF (line feed)
# x02 = STX (start of text)
# x03 = ETX (end of text)
#
if [[ $timecode == \\x02*\\x0a\\x0d\\x03 ]];
then
	clockstat ${timecode:4:1}
else
	quit "Timecode not complete" 3	# return Unkown status
fi

• Show peer status:

  ntpq -p

• Show timecode from receiver:

  ntpq -c 'cv 0 timecode'

• Show client list (max. 600):

  ntpdc -n -c monlist
  
  ## ntp 2.4.7 removed monlist in favour of ntpq's mrulist
  ntpq -c "mrulist"