Setting Celestron hand controller location via IP geolocation

hc-location.sh

#!/bin/bash

readonly serial=/dev/ttyS0

latlon="$(curl -s ipinfo.io | jq -r '.loc')"

lat=$(cut -d, -f1 <<< ${latlon})
lon=$(cut -d, -f2 <<< ${latlon})

location=$(./latlon2celestron.py "${lat}" "${lon}")
if [ ${?} != 0 ]; then exit; fi

stty -F ${serial} 9600

HEX="\\\\x%02X"
unset FORMAT
for i in {1..8}; do
  FORMAT="${FORMAT}${HEX}"
done

hex_text="$(printf "W${FORMAT}" ${location})"

echo -ne "${hex_text}" > ${serial}

latlon2celestron.py

#!/usr/bin/env python

import sys

lat = float(sys.argv[1])
lon = float(sys.argv[2])

def dms(deg):
    m = (abs(deg) - int(abs(deg))) * 60.0
    s = (abs(m) - int(abs(m))) * 60.0
    return (int(deg), int(m), int(s))

def celestron(deg):
    c = dms(deg)
    return "{0:d} {1:d} {2:d} {3:d}".format(abs(c[0]), c[1], c[2], 0 if(c[0] >= 0) else 1)

print "{0} {1}".format(celestron(lat), celestron(lon))