Run a NTP client at startup (#301)

* Added NTP service to startup

A NTP service script will run a NTP client on a custom NTP server
in order to synchronize the camera's clock. This may be useful in
cases where the camera has to use a local NTP server rather than
the one hard coded in iCamera.

To use this, simply set your desired NTP server in the `NTP_SERVER`
option in `wz_mini.conf`.

* Kill timesync if a custom NTP server is used

When using a custom NTP server, the timesync service with its
hard-coded NTP servers should not be running.

SD_ROOT/wz_mini/etc/init.d/S18ntp

@@ -0,0 +1,26 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:
+# Short-Description: Starts ntpd against a custom NTP server
+# Description:       The clock will synchronize against a user defined NTP server. Useful if the camera is on an isolated network.
+### END INIT INFO
+
+. /opt/wz_mini/wz_mini.conf
+
+case "$1" in
+	start)
+
+		echo "#####$(basename "$0")#####"
+		
+		if [ ! -z "$NTP_SERVER" ] ; then
+			# Slight delay required so that we can kill timesync from interfering
+			(sleep 30 && kill -9 $(pgrep -f timesync) ; /opt/wz_mini/tmp/.bin/ntpd -p "$NTP_SERVER") &
+		fi
+		
+		;;
+	*)
+		echo "Usage: $0 {start}"
+		exit 1
+		;;
+esac
+

SD_ROOT/wz_mini/etc/wz_mini.conf.dist

@@ -36,6 +36,8 @@ ENABLE_NFSv4="false"
 ENABLE_RTL8189FS_DRIVER="true"
 ENABLE_ATBM603X_DRIVER="true"
 
+NTP_SERVER=
+
 ##### NETWORK INTERFACE BONDING #####
 BONDING_ENABLED="false"
 BONDING_PRIMARY_INTERFACE="eth0"

SD_ROOT/wz_mini/wz_mini.conf

@@ -36,6 +36,8 @@ ENABLE_NFSv4="false"
 ENABLE_RTL8189FS_DRIVER="true"
 ENABLE_ATBM603X_DRIVER="true"
 
+NTP_SERVER=
+
 ##### NETWORK INTERFACE BONDING #####
 BONDING_ENABLED="false"
 BONDING_PRIMARY_INTERFACE="eth0"