Move device-exists check to within the loop

This means the loop will start and run even if the device is not
available, and the daemon will start when the device becomes available.

Author: nickandrew

scripts/start-xbee-daemon.sh

@@ -14,14 +14,16 @@ if [ ! -d $BASE_DIR ] ; then
 	exit 8
 fi
 
-if [ ! -c $DEV ] ; then
-	echo "No dev $DEV"
-	exit 8
-fi
-
 cd $BASE_DIR
 
 while true ; do
+
+	if [ ! -c $DEV ] ; then
+		echo "No dev $DEV"
+		sleep 30
+		continue
+	fi
+
 	stty 9600 raw -echo < $DEV
 
 	bin/xbee-daemon.pl -d $DEV "[::]:7862"