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Initial commit. Error handling is still a bit of a mess.
This commit is contained in:
Christopher Smith
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commit
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214
ir-aprsisd
Executable file
214
ir-aprsisd
Executable file
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#!/usr/bin/python3
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############################################################################
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##
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## ir-aprsisd
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##
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## This is a KML-feed to APRS-IS forwarding daemon. It was written
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## for Garmin/DeLorme inReach devices, but might work elsewhere too.
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## It polls a KML feed in which it expects to find a point in rougly
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## the form that the inReach online feeds use, with attendant course
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## and altitude data. It transfers each new point found there to
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## APRS-IS.
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##
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## K0SIN
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##
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###########################################################################
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import aprslib
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import urllib.request
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import xml.dom.minidom
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import time, calendar, math, re
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import platform, sys
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import configparser
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from optparse import OptionParser
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#Name of our configuration file.
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cf = "ir-aprsisd.cfg"
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#Configuration
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conf = configparser.ConfigParser()
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#Try /etc, then try the current directory, or just quit.
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try:
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conf.read("/etc/" + cf)
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if not conf.has_section('General'):
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conf.read(cf)
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if not conf.has_section('General'):
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sys.exit("Can't read configuration file: " + cf)
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except:
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sys.exit("Can't read configuration file: " + cf)
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#Command-line options
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op = OptionParser()
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op.add_option("-s","--ssid",action="store",type="string",dest="ssid",help="APRS SSID")
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op.add_option("-p","--pass",action="store",type="int",dest="passwd",help="APRS-IS password")
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op.add_option("-P","--port",action="store",type="int",dest="port",help="APRS-IS port")
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op.add_option("-u","--user",action="store",type="string",dest="user",help="inReach username")
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op.add_option("-U","--url",action="store",type="string",dest="url",help="URL for KML feed")
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op.add_option("-c","--comment",action="store",type="string",dest="comment",help="APRS-IS location beacon comment text")
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op.add_option("-d","--delay",action="store",type="int",dest="delay",help="Delay between polls of KML feed")
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(opts,args) = op.parse_args()
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#Allow command-line arguments to override the config file.
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if opts.ssid:
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conf['APRS']['SSID'] = opts.ssid
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if opts.passwd:
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conf['APRS']['Password'] = str(opts.passwd)
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if opts.port:
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conf['APRS']['Port'] = str(opts.port)
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if opts.user:
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conf['inReach']['User'] = opts.user
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if opts.url:
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conf['inReach']['URL'] = opts.url
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if opts.comment:
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conf['APRS']['Comment'] = opts.comment
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if opts.delay:
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conf['General']['Period'] = opts.delay
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#The beginning of our APRS packets should contain a source, path,
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# q construct, and gateway address. We'll reuse the same SSID as a gate.
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ARPreamble = ''.join([conf['APRS']['SSID'],'>APRS,','TCPIP*,','qAS,',conf['APRS']['SSID']])
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NAME = "iR-APRSISD"
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REV = "0.1"
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#Start with the current time. We use this to keep track of whether we've
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# already sent a position, so if we cut it off when the program starts, we
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# won't (re-)send old stale entry from inReach
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lastUpdate = calendar.timegm(time.gmtime())
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#Handle connection to APRS-IS
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def reconnect():
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global AIS
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while True:
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AIS = aprslib.IS(conf['APRS']['SSID'],passwd=conf['APRS']['Password'],port=conf['APRS']['Port'])
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try:
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AIS.connect()
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break
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except Exception as e:
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print("Trouble connecting to APRS-IS server.")
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print(e)
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#APRS-IS Setup
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AIS = None
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reconnect()
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while True:
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try:
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KML = urllib.request.urlopen(conf['inReach']['URL']).read()
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except Exception as e:
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print(''.join(["Error reading URL: ", conf['inReach']['URL']]))
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continue
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try:
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data = xml.dom.minidom.parseString(KML).documentElement
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#The first placemark will have the expanded current location information.
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position = data.getElementsByTagName('Placemark')[0]
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#Now process the extended data into something easier to handle.
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extended = {}
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for xd in position.getElementsByTagName('ExtendedData')[0].getElementsByTagName('Data'):
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if not xd.getElementsByTagName('value')[0].firstChild == None:
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extended[xd.getAttribute('name')] = xd.getElementsByTagName('value')[0].firstChild.nodeValue
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except Exception as e:
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print(''.join(["Could not parse data from URL: ",conf['inReach']['URL']]))
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continue
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try:
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#Here is the position vector
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latitude = extended['Latitude']
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longitude = extended['Longitude']
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elevation = extended['Elevation']
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velocity = extended['Velocity']
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course = extended['Course']
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uttime = extended['Time UTC']
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device = extended['Device Type']
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#Some time conversions. First the time struct.
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ts = time.strptime(''.join([uttime," UTC"]),"%m/%d/%Y %I:%M:%S %p %Z")
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#Unix epoch time for local record-keeping.
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etime = calendar.timegm(ts)
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#MonthDayHoursMinutes_z for APRS-IS packet
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aprstime = time.strftime("%d%H%Mz",ts)
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#Skip this one if it's old.
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if lastUpdate > etime:
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time.sleep(conf.getfloat('General','Period'))
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continue
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#Append the device type to the comment
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conf['APRS']['Comment'] = ''.join([" ",conf['APRS']['Comment']," : ", NAME," v",REV," : ",platform.system()," on ",platform.machine()," : ",device])
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#Latitude conversion
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#We start with the truncated degrees, filled to two places
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# then add fractional minutes two 2x2 digits.
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latitude = float(latitude)
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aprslat = str(abs(math.trunc(latitude))).zfill(2)
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aprslat += '{:.02f}'.format(round((abs(latitude)-abs(math.trunc(latitude)))*60,2)).zfill(5)
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if latitude > 0:
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aprslat += "N"
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else:
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aprslat += "S"
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#Longitude next.
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longitude = float(longitude)
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aprslong = str(abs(math.trunc(longitude))).zfill(3)
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aprslong += '{:.02f}'.format(round((abs(longitude)-abs(math.trunc(longitude)))*60,2)).zfill(5)
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if longitude > 0:
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aprslong += "E"
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else:
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aprslong += "W"
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#Altitude needs to be in feet above sea-level
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# what we get instead is a string with a number of meters
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# at the beginning.
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aprsalt = re.sub(r'^(\d+\.?\d+)\s*m.*',r'\1',elevation)
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#We need integer feet, six digits
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aprsalt = str(round(float(aprsalt) * 3.2808399)).zfill(6)
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aprsalt = "/A=" + aprsalt[0:6]
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#Aprs position
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aprspos = ''.join([aprslat,conf['APRS']['Separator'],aprslong,conf['APRS']['Symbol']])
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#Course is already in degrees, so we just need to reformat it.
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aprscourse = str(round(float(re.sub(r'(\d+\.?\d+).*',r'\1', course)))).zfill(3)
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#Speed is in km/h.
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aprsspeed = float(re.sub(r'(\d+\.?\d+).*',r'\1',velocity))*0.53995681
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aprsspeed = str(min(round(aprsspeed),999)).zfill(3)
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#Here's the course/speed combination
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aprscs = ''.join([aprscourse,'/',aprsspeed])
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except Exception as e:
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print("Some relevant position vector data is missing or malformatted in this record.")
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print(e)
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#Pass? Maybe...
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pass
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try:
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#According to spec, one valid format for location beacons is
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# @092345z/4903.50N/07201.75W>088/036
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# with a comment on the end that can include altitude and other
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# information.
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aprsPacket = ''.join([ARPreamble,':@',aprstime,aprspos,aprscs,aprsalt,conf['APRS']['Comment']])
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print(aprsPacket)
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#This will throw an exception if the packet is somehow wrong.
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aprslib.parse(aprsPacket)
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AIS.sendall(aprsPacket)
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lastUpdate = etime
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except Exception as e:
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print("Could not send the update: ")
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if 'aprsPacket' in locals():
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print(aprsPacket)
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print(e)
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print("Attempting reconnection, just in case.")
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reconnect()
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pass
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time.sleep(conf.getfloat('General','Period'))
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26
ir-aprsisd.cfg
Normal file
26
ir-aprsisd.cfg
Normal file
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@ -0,0 +1,26 @@
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[inReach]
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User = Your-inReach-Username
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# This should be the location of your KML feed.
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URL = https://share.garmin.com/Feed/Share/%(User)s
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[APRS]
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SSID = N0CALL-10
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Password = 1234
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Port = 14580
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#If the separator is /, your icon will come from the primary symbol table.
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# if it is \, it will draw from the secondary table.
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Separator = /
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#This character represents an APRS icon from the table tied to Separator.
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Symbol = (
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#This information is included at the end of each packet, along with some
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# other data.
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Comment = APRS-IS KML forwarder, by K0SIN
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[General]
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# KML polling interval in seconds.
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Period = 300
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