602 lines
23 KiB
Python
602 lines
23 KiB
Python
from owrx.map import Map, LatLngLocation
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from owrx.metrics import Metrics, CounterMetric
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from owrx.bands import Bandplan
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from datetime import datetime, timezone
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from csdr.module import PickleModule
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import re
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import logging
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logger = logging.getLogger(__name__)
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# speed is in knots... convert to metric (km/h)
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knotsToKilometers = 1.852
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feetToMeters = 0.3048
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milesToKilometers = 1.609344
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inchesToMilimeters = 25.4
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def fahrenheitToCelsius(f):
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return (f - 32) * 5 / 9
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# not sure what the correct encoding is. it seems TAPR has set utf-8 as a standard, but not everybody is following it.
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encoding = "utf-8"
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# regex for altitute in comment field
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altitudeRegex = re.compile("(^.*)\\/A=([0-9]{6})(.*$)")
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# regex for parsing third-party headers
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thirdpartyeRegex = re.compile("^([a-zA-Z0-9-]+)>((([a-zA-Z0-9-]+\\*?,)*)([a-zA-Z0-9-]+\\*?)):(.*)$")
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# regex for getting the message id out of message
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messageIdRegex = re.compile("^(.*){([0-9]{1,5})$")
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# regex to filter pseudo "WIDE" path elements
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widePattern = re.compile("^WIDE[0-9]$")
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def decodeBase91(input):
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base = decodeBase91(input[:-1]) * 91 if len(input) > 1 else 0
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return base + (ord(input[-1]) - 33)
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def getSymbolData(symbol, table):
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return {"symbol": symbol, "table": table, "index": ord(symbol) - 33, "tableindex": ord(table) - 33}
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class Ax25Parser(PickleModule):
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def process(self, ax25frame):
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control_pid = ax25frame.find(bytes([0x03, 0xF0]))
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if control_pid % 7 > 0:
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logger.warning("aprs packet framing error: control/pid position not aligned with 7-octet callsign data")
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def chunks(l, n):
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"""Yield successive n-sized chunks from l."""
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for i in range(0, len(l), n):
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yield l[i:i + n]
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try:
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return {
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"destination": self.extractCallsign(ax25frame[0:7]),
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"source": self.extractCallsign(ax25frame[7:14]),
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"path": [self.extractCallsign(c) for c in chunks(ax25frame[14:control_pid], 7)],
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"data": ax25frame[control_pid + 2 :],
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}
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except (ValueError, IndexError):
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logger.exception("error parsing ax25 frame")
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def extractCallsign(self, input):
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cs = {
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"callsign": bytes([b >> 1 for b in input[0:6]]).decode(encoding, "replace").strip(),
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}
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ssid = (input[6] & 0b00011110) >> 1
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if ssid > 0:
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cs["ssid"] = ssid
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return cs
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class WeatherMapping(object):
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def __init__(self, char, key, length, scale=None):
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self.char = char
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self.key = key
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self.length = length
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self.scale = scale
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def matches(self, input):
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return self.char == input[0] and len(input) > self.length
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def updateWeather(self, weather, input):
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def deepApply(obj, key, v):
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keys = key.split(".")
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if len(keys) > 1:
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if not keys[0] in obj:
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obj[keys[0]] = {}
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deepApply(obj[keys[0]], ".".join(keys[1:]), v)
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else:
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obj[key] = v
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try:
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value = int(input[1 : 1 + self.length])
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if self.scale:
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value = self.scale(value)
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deepApply(weather, self.key, value)
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except ValueError:
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pass
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remain = input[1 + self.length :]
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return weather, remain
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class WeatherParser(object):
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mappings = [
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WeatherMapping("c", "wind.direction", 3),
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WeatherMapping("s", "wind.speed", 3, lambda x: x * milesToKilometers),
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WeatherMapping("g", "wind.gust", 3, lambda x: x * milesToKilometers),
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WeatherMapping("t", "temperature", 3, fahrenheitToCelsius),
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WeatherMapping("r", "rain.hour", 3, lambda x: x / 100 * inchesToMilimeters),
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WeatherMapping("p", "rain.day", 3, lambda x: x / 100 * inchesToMilimeters),
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WeatherMapping("P", "rain.sincemidnight", 3, lambda x: x / 100 * inchesToMilimeters),
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WeatherMapping("h", "humidity", 2),
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WeatherMapping("b", "barometricpressure", 5, lambda x: x / 10),
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WeatherMapping("s", "snowfall", 3, lambda x: x * 25.4),
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]
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def __init__(self, data, weather=None):
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self.data = data
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self.weather = {} if weather is None else weather
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def getWeather(self):
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doWork = True
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weather = self.weather
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while doWork:
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mapping = next((m for m in WeatherParser.mappings if m.matches(self.data)), None)
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if mapping:
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(weather, remain) = mapping.updateWeather(weather, self.data)
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self.data = remain
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doWork = len(self.data) > 0
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else:
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doWork = False
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return weather
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def getRemainder(self):
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return self.data
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class AprsLocation(LatLngLocation):
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def __init__(self, data):
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super().__init__(data["lat"], data["lon"])
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self.data = data
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def __dict__(self):
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res = super(AprsLocation, self).__dict__()
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for key in ["comment", "symbol", "course", "speed"]:
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if key in self.data:
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res[key] = self.data[key]
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return res
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class AprsParser(PickleModule):
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def __init__(self):
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super().__init__()
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self.metrics = {}
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self.band = None
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def setDialFrequency(self, freq):
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self.band = Bandplan.getSharedInstance().findBand(freq)
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def getMetric(self, category):
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if category not in self.metrics:
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band = "unknown"
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if self.band is not None:
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band = self.band.getName()
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name = "aprs.decodes.{band}.aprs.{category}".format(band=band, category=category)
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metrics = Metrics.getSharedInstance()
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self.metrics[category] = metrics.getMetric(name)
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if self.metrics[category] is None:
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self.metrics[category] = CounterMetric()
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metrics.addMetric(name, self.metrics[category])
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return self.metrics[category]
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def isDirect(self, aprsData):
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if "path" in aprsData and len(aprsData["path"]) > 0:
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hops = [host for host in aprsData["path"] if widePattern.match(host["callsign"]) is None]
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if len(hops) > 0:
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return False
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if "type" in aprsData and aprsData["type"] in ["thirdparty", "item", "object"]:
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return False
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return True
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def process(self, data):
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try:
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# TODO how can we tell if this is an APRS frame at all?
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aprsData = self.parseAprsData(data)
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logger.debug("decoded APRS data: %s", aprsData)
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self.updateMap(aprsData)
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self.getMetric("total").inc()
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if self.isDirect(aprsData):
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self.getMetric("direct").inc()
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# the frontend uses this to distinguis hessages from the different parsers
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aprsData["mode"] = "APRS"
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return aprsData
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except Exception:
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logger.exception("exception while parsing aprs data")
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def updateMap(self, mapData):
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if "type" in mapData and mapData["type"] == "thirdparty" and "data" in mapData:
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mapData = mapData["data"]
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if "lat" in mapData and "lon" in mapData:
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loc = AprsLocation(mapData)
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source = mapData["source"].copy()
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# these are special packets, sent on behalf of other entities
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if "type" in mapData:
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if mapData["type"] == "item" and "item" in mapData:
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source["item"] = mapData["item"]
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elif mapData["type"] == "object" and "object" in mapData:
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source["object"] = mapData["object"]
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Map.getSharedInstance().updateLocation(source, loc, "APRS", self.band)
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def hasCompressedCoordinates(self, raw):
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return raw[0] == "/" or raw[0] == "\\"
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def parseUncompressedCoordinates(self, raw):
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lat = int(raw[0:2]) + float(raw[2:7]) / 60
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if raw[7] == "S":
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lat *= -1
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lon = int(raw[9:12]) + float(raw[12:17]) / 60
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if raw[17] == "W":
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lon *= -1
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return {"lat": lat, "lon": lon, "symbol": getSymbolData(raw[18], raw[8])}
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def parseCompressedCoordinates(self, raw):
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return {
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"lat": 90 - decodeBase91(raw[1:5]) / 380926,
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"lon": -180 + decodeBase91(raw[5:9]) / 190463,
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"symbol": getSymbolData(raw[9], raw[0]),
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}
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def parseTimestamp(self, raw):
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now = datetime.now()
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if raw[6] == "h":
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ts = datetime.strptime(raw[0:6], "%H%M%S")
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ts = ts.replace(year=now.year, month=now.month, day=now.month, tzinfo=timezone.utc)
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else:
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ts = datetime.strptime(raw[0:6], "%d%H%M")
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ts = ts.replace(year=now.year, month=now.month)
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if raw[6] == "z":
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ts = ts.replace(tzinfo=timezone.utc)
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elif raw[6] == "/":
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ts = ts.replace(tzinfo=now.tzinfo)
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else:
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logger.warning("invalid timezone info byte: %s", raw[6])
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return int(ts.timestamp() * 1000)
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def parseStatusUpate(self, raw):
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res = {"type": "status"}
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if raw[6] == "z":
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res["timestamp"] = self.parseTimestamp(raw[0:7])
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res["comment"] = raw[7:]
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else:
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res["comment"] = raw
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return res
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def parseAprsData(self, data):
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information = data["data"]
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# forward some of the ax25 data
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aprsData = {"source": data["source"], "destination": data["destination"], "path": data["path"]}
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if information[0] == 0x1C or information[0] == ord("`") or information[0] == ord("'"):
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aprsData.update(MicEParser().parse(data))
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return aprsData
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information = information.decode(encoding, "replace")
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# APRS data type identifier
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dti = information[0]
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if dti == "!" or dti == "=":
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# position without timestamp
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aprsData.update(self.parseRegularAprsData(information[1:]))
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elif dti == "/" or dti == "@":
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# position with timestamp
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aprsData["timestamp"] = self.parseTimestamp(information[1:8])
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aprsData.update(self.parseRegularAprsData(information[8:]))
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elif dti == ">":
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# status update
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aprsData.update(self.parseStatusUpate(information[1:]))
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elif dti == "}":
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# third party
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aprsData.update(self.parseThirdpartyAprsData(information[1:]))
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elif dti == ":":
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# message
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aprsData.update(self.parseMessage(information[1:]))
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elif dti == ";":
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# object
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aprsData.update(self.parseObject(information[1:]))
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elif dti == ")":
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# item
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aprsData.update(self.parseItem(information[1:]))
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return aprsData
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def parseObject(self, information):
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result = {"type": "object"}
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if len(information) > 16:
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result["object"] = information[0:9].strip()
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result["live"] = information[9] == "*"
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result["timestamp"] = self.parseTimestamp(information[10:17])
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result.update(self.parseRegularAprsData(information[17:]))
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# override type, losing information about compression
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result["type"] = "object"
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return result
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def parseItem(self, information):
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result = {"type": "item"}
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if len(information) > 3:
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indexes = [information[0:10].find(p) for p in ["!", "_"]]
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filtered = [i for i in indexes if i >= 3]
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filtered.sort()
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if len(filtered):
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index = filtered[0]
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result["item"] = information[0:index]
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result["live"] = information[index] == "!"
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result.update(self.parseRegularAprsData(information[index + 1 :]))
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# override type, losing information about compression
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result["type"] = "item"
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return result
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def parseMessage(self, information):
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result = {"type": "message"}
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if len(information) > 9 and information[9] == ":":
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result["adressee"] = information[0:9]
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message = information[10:]
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if len(message) > 3 and message[0:3] == "ack":
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result["type"] = "messageacknowledgement"
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result["messageid"] = int(message[3:8])
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elif len(message) > 3 and message[0:3] == "rej":
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result["type"] = "messagerejection"
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result["messageid"] = int(message[3:8])
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else:
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matches = messageIdRegex.match(message)
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if matches:
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result["messageid"] = int(matches.group(2))
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message = matches.group(1)
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result["message"] = message
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return result
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def parseThirdpartyAprsData(self, information):
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# in thirdparty packets, the callsign is passed as a string with -SSID suffix...
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# this seems to be the only case where parsing is necessary, hence this function is inline
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def parseCallsign(callsign):
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el = callsign.split('-')
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result = {"callsign": el[0]}
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if len(el) > 1:
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result["ssid"] = int(el[1])
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return result
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matches = thirdpartyeRegex.match(information)
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if matches:
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path = matches.group(2).split(",")
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destination = next((c.strip("*").upper() for c in path if c.endswith("*")), None)
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data = self.parseAprsData(
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{
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"source": parseCallsign(matches.group(1).upper()),
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"destination": parseCallsign(destination),
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"path": [parseCallsign(c) for c in path],
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"data": matches.group(6).encode(encoding),
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}
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)
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return {"type": "thirdparty", "data": data}
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return {"type": "thirdparty"}
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def parseRegularAprsData(self, information):
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if self.hasCompressedCoordinates(information):
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aprsData = self.parseCompressedCoordinates(information[0:10])
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aprsData["type"] = "compressed"
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if information[10] != " ":
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if information[10] == "{":
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# pre-calculated radio range
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aprsData["range"] = 2 * 1.08 ** (ord(information[11]) - 33) * milesToKilometers
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else:
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aprsData["course"] = (ord(information[10]) - 33) * 4
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# speed is in knots... convert to metric (km/h)
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aprsData["speed"] = (1.08 ** (ord(information[11]) - 33) - 1) * knotsToKilometers
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# compression type
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t = ord(information[12])
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aprsData["fix"] = (t & 0b00100000) > 0
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sources = ["other", "GLL", "GGA", "RMC"]
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aprsData["nmeasource"] = sources[(t & 0b00011000) >> 3]
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origins = [
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"Compressed",
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"TNC BText",
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"Software",
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"[tbd]",
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"KPC3",
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"Pico",
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"Other tracker",
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"Digipeater conversion",
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]
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aprsData["compressionorigin"] = origins[t & 0b00000111]
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comment = information[13:]
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else:
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aprsData = self.parseUncompressedCoordinates(information[0:19])
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aprsData["type"] = "regular"
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comment = information[19:]
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def decodeHeightGainDirectivity(comment):
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res = {"height": 2 ** int(comment[4]) * 10 * feetToMeters, "gain": int(comment[5])}
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directivity = int(comment[6])
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if directivity == 0:
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res["directivity"] = "omni"
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elif 0 < directivity < 9:
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res["directivity"] = directivity * 45
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return res
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# aprs data extensions
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# yes, weather stations are officially identified by their symbols. go figure...
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if "symbol" in aprsData and aprsData["symbol"]["index"] == 62:
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# weather report
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weather = {}
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if len(comment) > 6 and comment[3] == "/":
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try:
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weather["wind"] = {"direction": int(comment[0:3]), "speed": int(comment[4:7]) * milesToKilometers}
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except ValueError:
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pass
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comment = comment[7:]
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parser = WeatherParser(comment, weather)
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aprsData["weather"] = parser.getWeather()
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comment = parser.getRemainder()
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elif len(comment) > 6:
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if comment[3] == "/":
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# course and speed
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# for a weather report, this would be wind direction and speed
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try:
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aprsData["course"] = int(comment[0:3])
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aprsData["speed"] = int(comment[4:7]) * knotsToKilometers
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except ValueError:
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pass
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comment = comment[7:]
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elif comment[0:3] == "PHG":
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# station power and effective antenna height/gain/directivity
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try:
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powerCodes = [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
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aprsData["power"] = powerCodes[int(comment[3])]
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aprsData.update(decodeHeightGainDirectivity(comment))
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except ValueError:
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pass
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comment = comment[7:]
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elif comment[0:3] == "RNG":
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# pre-calculated radio range
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try:
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aprsData["range"] = int(comment[3:7]) * milesToKilometers
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except ValueError:
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pass
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comment = comment[7:]
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elif comment[0:3] == "DFS":
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# direction finding signal strength and antenna height/gain
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try:
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aprsData["strength"] = int(comment[3])
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aprsData.update(decodeHeightGainDirectivity(comment))
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except ValueError:
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pass
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comment = comment[7:]
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matches = altitudeRegex.match(comment)
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if matches:
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aprsData["altitude"] = int(matches.group(2)) * feetToMeters
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comment = matches.group(1) + matches.group(3)
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aprsData["comment"] = comment
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return aprsData
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class MicEParser(object):
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def extractNumber(self, input):
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n = ord(input)
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if n >= ord("P"):
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return n - ord("P")
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if n >= ord("A"):
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return n - ord("A")
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return n - ord("0")
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def listToNumber(self, input):
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base = self.listToNumber(input[:-1]) * 10 if len(input) > 1 else 0
|
|
return base + input[-1]
|
|
|
|
def extractAltitude(self, comment):
|
|
if len(comment) < 4 or comment[3] != "}":
|
|
return (comment, None)
|
|
return comment[4:], decodeBase91(comment[:3]) - 10000
|
|
|
|
def extractDevice(self, comment):
|
|
if len(comment) > 0:
|
|
if comment[0] == ">":
|
|
if len(comment) > 1:
|
|
if comment[-1] == "=":
|
|
return comment[1:-1], {"manufacturer": "Kenwood", "device": "TH-D72"}
|
|
if comment[-1] == "^":
|
|
return comment[1:-1], {"manufacturer": "Kenwood", "device": "TH-D74"}
|
|
return comment[1:], {"manufacturer": "Kenwood", "device": "TH-D7A"}
|
|
if comment[0] == "]":
|
|
if len(comment) > 1 and comment[-1] == "=":
|
|
return comment[1:-1], {"manufacturer": "Kenwood", "device": "TM-D710"}
|
|
return comment[1:], {"manufacturer": "Kenwood", "device": "TM-D700"}
|
|
if len(comment) > 2 and (comment[0] == "`" or comment[0] == "'"):
|
|
if comment[-2] == "_":
|
|
devices = {
|
|
"b": "VX-8",
|
|
'"': "FTM-350",
|
|
"#": "VX-8G",
|
|
"$": "FT1D",
|
|
"%": "FTM-400DR",
|
|
")": "FTM-100D",
|
|
"(": "FT2D",
|
|
"0": "FT3D",
|
|
}
|
|
return comment[1:-2], {"manufacturer": "Yaesu", "device": devices.get(comment[-1], "Unknown")}
|
|
if comment[-2:] == " X":
|
|
return comment[1:-2], {"manufacturer": "SainSonic", "device": "AP510"}
|
|
if comment[-2] == "(":
|
|
devices = {"5": "D578UV", "8": "D878UV"}
|
|
return comment[1:-2], {"manufacturer": "Anytone", "device": devices.get(comment[-1], "Unknown")}
|
|
if comment[-2] == "|":
|
|
devices = {"3": "TinyTrack3", "4": "TinyTrack4"}
|
|
return comment[1:-2], {"manufacturer": "Byonics", "device": devices.get(comment[-1], "Unknown")}
|
|
if comment[-2:] == "^v":
|
|
return comment[1:-2], {"manufacturer": "HinzTec", "device": "anyfrog"}
|
|
if comment[-2] == ":":
|
|
devices = {"4": "P4dragon DR-7400 modem", "8": "P4dragon DR-7800 modem"}
|
|
return (
|
|
comment[1:-2],
|
|
{"manufacturer": "SCS GmbH & Co.", "device": devices.get(comment[-1], "Unknown")},
|
|
)
|
|
if comment[-2:] == "~v":
|
|
return comment[1:-2], {"manufacturer": "Other", "device": "Other"}
|
|
return comment[1:-2], None
|
|
return comment, None
|
|
|
|
def parse(self, data):
|
|
information = data["data"]
|
|
destination = data["destination"]["callsign"]
|
|
|
|
rawLatitude = [self.extractNumber(c) for c in destination[0:6]]
|
|
lat = self.listToNumber(rawLatitude[0:2]) + self.listToNumber(rawLatitude[2:6]) / 6000
|
|
if ord(destination[3]) <= ord("9"):
|
|
lat *= -1
|
|
|
|
lon = information[1] - 28
|
|
if ord(destination[4]) >= ord("P"):
|
|
lon += 100
|
|
if 180 <= lon <= 189:
|
|
lon -= 80
|
|
if 190 <= lon <= 199:
|
|
lon -= 190
|
|
|
|
minutes = information[2] - 28
|
|
if minutes >= 60:
|
|
minutes -= 60
|
|
|
|
lon += minutes / 60 + (information[3] - 28) / 6000
|
|
|
|
if ord(destination[5]) >= ord("P"):
|
|
lon *= -1
|
|
|
|
speed = (information[4] - 28) * 10
|
|
dc28 = information[5] - 28
|
|
speed += int(dc28 / 10)
|
|
course = (dc28 % 10) * 100
|
|
course += information[6] - 28
|
|
if speed >= 800:
|
|
speed -= 800
|
|
if course >= 400:
|
|
course -= 400
|
|
# speed is in knots... convert to metric (km/h)
|
|
speed *= knotsToKilometers
|
|
|
|
comment = information[9:].decode(encoding, "replace").strip()
|
|
(comment, altitude) = self.extractAltitude(comment)
|
|
|
|
(comment, device) = self.extractDevice(comment)
|
|
|
|
# altitude might be inside the device string, so repeat and choose one
|
|
(comment, insideAltitude) = self.extractAltitude(comment)
|
|
altitude = next((a for a in [altitude, insideAltitude] if a is not None), None)
|
|
|
|
return {
|
|
"fix": information[0] == ord("`") or information[0] == 0x1C,
|
|
"lat": lat,
|
|
"lon": lon,
|
|
"comment": comment,
|
|
"altitude": altitude,
|
|
"speed": speed,
|
|
"course": course,
|
|
"device": device,
|
|
"type": "Mic-E",
|
|
"symbol": getSymbolData(chr(information[7]), chr(information[8])),
|
|
}
|