687 lines
22 KiB
Python
687 lines
22 KiB
Python
import time
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import re
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import math
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import logging
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from datetime import datetime
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from .exceptions import *
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__all__ = ['parse']
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logger = logging.getLogger(__name__)
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# Mic-e message type table
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MTYPE_TABLE_STD = {
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"111": "M0: Off Duty",
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"110": "M1: En Route",
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"101": "M2: In Service",
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"100": "M3: Returning",
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"011": "M4: Committed",
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"010": "M5: Special",
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"001": "M6: Priority",
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"000": "Emergency",
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}
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MTYPE_TABLE_CUSTOM = {
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"111": "C0: Custom-0",
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"110": "C1: Custom-1",
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"101": "C2: Custom-2",
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"100": "C3: Custom-3",
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"011": "C4: Custom-4",
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"010": "C5: Custom-5",
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"001": "C6: Custom-6",
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"000": "Emergency",
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}
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def base91(text):
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"""
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Takes a base91 char string and returns decimal
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"""
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decimal = 0
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length = len(text)
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for i in range(length):
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decimal += (ord(text[i]) - 33) * (91.0 ** (length-1-i))
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return decimal if text != '' else ''
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def parse(raw_sentence):
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"""
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Parses an APRS packet and returns a dict with decoded data
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- All attributes are in meteric units
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Supports:
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* normal/compressed/mic-e position reports
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- including comment extentions for altitude and telemetry
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* messages including bulletins, announcements and telemetry
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* status message
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"""
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raw_sentence = raw_sentence.rstrip("\r\n")
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logger.debug("Parsing: %s", raw_sentence)
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if len(raw_sentence) == 0:
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raise ParseError("packet is empty", raw_sentence)
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try:
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(header, body) = raw_sentence.split(':', 1)
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except:
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raise ParseError("packet has no body", raw_sentence)
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if len(body) == 0:
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raise ParseError("packet body is empty", raw_sentence)
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if not re.match(r"^[ -~]+$", header):
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raise ParseError("packet header contains non-ascii characters ", raw_sentence)
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try:
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(fromcall, path) = header.split('>', 1)
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except:
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raise ParseError("invalid packet header", raw_sentence)
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# TODO: validate callsigns??
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path = path.split(',')
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if len(path) < 1 or len(path[0]) == 0:
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raise ParseError("no tocallsign", raw_sentence)
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tocall = path[0]
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path = path[1:]
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parsed = {
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'raw': raw_sentence,
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'from': fromcall,
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'to': tocall,
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'path': path,
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}
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try:
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viacall = path[-1] if re.match(r"^qA[CXUoOSrRRZI]$", path[-2]) else ""
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parsed.update({'via': viacall})
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except:
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pass
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packet_type = body[0]
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body = body[1:]
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if len(body) == 0 and packet_type != '>':
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raise ParseError("packet body is empty after packet type character", raw_sentence)
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# attempt to parse the body
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# ------------------------------------------------------------------------------
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# try and parse timestamp first for status and position reports
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if packet_type in '>/@':
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# try to parse timestamp
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match = re.findall(r"^((\d{6})(.))$", body[0:7])
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if match:
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rawts, ts, form = match[0]
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utc = datetime.utcnow()
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if packet_type == '>' and form != 'z':
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raise ParseError("Time format for status reports should be zulu", raw_sentence)
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parsed.update({'raw_timestamp': rawts})
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try:
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if form in "hz/":
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if form == 'h': # zulu hhmmss format
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timestamp = utc.strptime(
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"%s %s %s %s" % (utc.year, utc.month, utc.day, ts),
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"%Y %m %d %H%M%S"
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)
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elif form == 'z': # zulu ddhhss format
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timestamp = utc.strptime(
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"%s %s %s" % (utc.year, utc.month, ts),
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"%Y %m %d%M%S"
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)
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elif form == '/': # '/' local ddhhss format
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timestamp = utc.strptime(
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"%s %s %s" % (utc.year, utc.month, ts),
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"%Y %m %d%M%S"
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)
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timestamp = time.mktime(timestamp.timetuple())
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else:
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timestamp = 0
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except:
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timestamp = 0
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parsed.update({'timestamp': int(timestamp)})
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# remove datetime from the body for further parsing
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body = body[7:]
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# Mic-encoded packet
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#
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# 'lllc/s$/......... Mic-E no message capability
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# 'lllc/s$/>........ Mic-E message capability
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# `lllc/s$/>........ Mic-E old posit
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if packet_type in "`'":
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logger.debug("Attempting to parse as mic-e packet")
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parsed.update({'format': 'mic-e'})
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dstcall = tocall.split('-')[0]
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# verify mic-e format
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if len(dstcall) != 6:
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raise ParseError("dstcall has to be 6 characters", raw_sentence)
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if len(body) < 8:
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raise ParseError("packet data field is too short", raw_sentence)
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if not re.match(r"^[0-9A-Z]{3}[0-9L-Z]{3}$", dstcall):
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raise ParseError("invalid dstcall", raw_sentence)
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if not re.match(r"^[&-\x7f][&-a][\x1c-\x7f]{2}[\x1c-\x7d][\x1c-\x7f][\x21-\x7e][\/\\0-9A-Z]", body):
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raise ParseError("invalid data format", raw_sentence)
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# get symbol table and symbol
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parsed.update({
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'symbol': body[6],
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'symbol_table': body[7]
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})
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# parse latitude
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# the routine translates each characters into a lat digit as described in
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# 'Mic-E Destination Address Field Encoding' table
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tmpdstcall = ""
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for i in dstcall:
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if i in "KLZ": # spaces
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tmpdstcall += " "
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elif ord(i) > 76: # P-Y
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tmpdstcall += chr(ord(i) - 32)
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elif ord(i) > 57: # A-J
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tmpdstcall += chr(ord(i) - 16)
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else: # 0-9
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tmpdstcall += i
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# determine position ambiguity
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match = re.findall(r"^\d+( *)$", tmpdstcall)
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if not match:
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raise ParseError("invalid latitude ambiguity", raw_sentence)
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posambiguity = len(match[0])
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parsed.update({
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'posambiguity': posambiguity
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})
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# adjust the coordinates be in center of ambiguity box
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tmpdstcall = list(tmpdstcall)
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if posambiguity > 0:
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if posambiguity >= 4:
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tmpdstcall[2] = '3'
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else:
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tmpdstcall[6 - posambiguity] = '5'
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tmpdstcall = "".join(tmpdstcall)
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latminutes = float(("%s.%s" % (tmpdstcall[2:4], tmpdstcall[4:6])).replace(" ", "0"))
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if latminutes >= 60:
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raise ParseError("Latitude minutes >= 60", raw_sentence)
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latitude = int(tmpdstcall[0:2]) + (latminutes / 60.0)
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# determine the sign N/S
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latitude = -latitude if ord(dstcall[3]) <= 0x4c else latitude
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parsed.update({
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'latitude': latitude
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})
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# parse message bits
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mbits = re.sub(r"[0-9L]", "0", dstcall[0:3])
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mbits = re.sub(r"[P-Z]", "1", mbits)
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mbits = re.sub(r"[A-K]", "2", mbits)
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parsed.update({
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'mbits': mbits
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})
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# resolve message type
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if mbits.find("2") > -1:
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parsed.update({
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'mtype': MTYPE_TABLE_CUSTOM[mbits.replace("2", "1")]
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})
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else:
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parsed.update({
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'mtype': MTYPE_TABLE_STD[mbits]
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})
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# parse longitude
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longitude = ord(body[0]) - 28 # decimal part of longitude
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longitude += 100 if ord(dstcall[4]) >= 0x50 else 0 # apply lng offset
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longitude += -80 if longitude >= 180 and longitude <= 189 else 0
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longitude += -190 if longitude >= 190 and longitude <= 199 else 0
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# long minutes
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lngminutes = ord(body[1]) - 28.0
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lngminutes += -60 if lngminutes >= 60 else 0
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# + (long hundredths of minutes)
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lngminutes += ((ord(body[2]) - 28.0) / 100.0)
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# apply position ambiguity
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# routines adjust longitude to center of the ambiguity box
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if posambiguity is 4:
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lngminutes = 30
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elif posambiguity is 3:
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lngminutes = (math.floor(lngminutes/10) + 0.5) * 10
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elif posambiguity is 2:
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lngminutes = math.floor(lngminutes) + 0.5
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elif posambiguity is 1:
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lngminutes = (math.floor(lngminutes*10) + 0.5) / 10.0
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elif posambiguity is not 0:
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raise ParseError("Unsupported position ambiguity: %d" % posambiguity, raw_sentence)
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longitude += lngminutes / 60.0
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# apply E/W sign
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longitude = 0 - longitude if ord(dstcall[5]) >= 0x50 else longitude
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parsed.update({
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'longitude': longitude
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})
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# parse speed and course
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speed = (ord(body[3]) - 28) * 10
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course = ord(body[4]) - 28
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quotient = int(course / 10.0)
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course += -(quotient * 10)
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course = course*100 + ord(body[5]) - 28
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speed += quotient
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speed += -800 if speed >= 800 else 0
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course += -400 if course >= 400 else 0
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speed *= 1.852 # knots * 1.852 = kmph
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parsed.update({
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'speed': speed,
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'course': course
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})
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# the rest of the packet can contain telemetry and comment
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if len(body) > 8:
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body = body[8:]
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# check for optional 2 or 5 channel telemetry
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match = re.findall(r"^('[0-9a-f]{10}|`[0-9-af]{4})(.*)$", body)
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if match:
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hexdata, body = match[0]
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hexdata = hexdata[1:] # remove telemtry flag
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channels = len(hexdata) / 2 # determine number of channels
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hexdata = int(hexdata, 16) # convert hex to int
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telemetry = []
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for i in range(channels):
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telemetry.insert(0, int(hexdata >> 8*i & 255))
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parsed.update({'telemetry': telemetry})
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# check for optional altitude
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match = re.findall(r"^(.*)([!-{]{3})\}(.*)$", body)
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if match:
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body, altitude, extra = match[0]
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altitude = base91(altitude) - 10000
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parsed.update({'altitude': altitude})
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body = body + extra
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# attempt to parsed comment telemetry
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body, telemetry = _parse_comment_telemetry(body)
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parsed.update(telemetry)
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#TODO !DAO! parsing
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# rest is a comment
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parsed.update({'comment': body})
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# STATUS PACKET
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#
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# >DDHHMMzComments
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# >Comments
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elif packet_type == '>':
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logger.debug("Packet is just a status message")
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parsed.update({
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'format': 'status',
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'status': body
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})
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# MESSAGE PACKET
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#
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# :ADDRESSEE:Message text ........{XXXXX Up to 5 char line number
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# :ADDRESSEE:ackXXXXX Ack for same line number
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# :ADDRESSEE:Message text ........{MM}AA Line# with REPLY ACK
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#
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# TELEMETRY MESSAGES
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#
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# :N3MIM:PARM.Battery,BTemp,AirTemp,Pres,Altude,Camra,Chute,Sun,10m,ATV
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# :N3MIM:UNIT.Volts,deg.F,deg.F,Mbar,Kfeet,Clik,OPEN!,on,on,high
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# :N3MIM:EQNS.0,2.6,0,0,.53,-32,3,4.39,49,-32,3,18,1,2,3
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# :N3MIM:BITS.10110101,PROJECT TITLE...
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elif packet_type == ':':
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# the while loop is used to easily break out once a match is found
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while True:
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# try to match bulletin
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match = re.findall(r"^BLN([0-9])([a-zA-Z0-9 \-]{5}):(.{0,67})", body)
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if match:
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bid, identifier, text = match[0]
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identifier = identifier.rstrip(' ')
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mformat = 'bulletin' if identifier == "" else 'group-bulletin'
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parsed.update({
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'format': mformat,
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'message_text': text,
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'bid': bid,
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'identifier': identifier
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})
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break
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# try to match announcement
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match = re.findall(r"^BLN([A-Z])([a-zA-Z0-9 \-]{5}):(.{0,67})", body)
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if match:
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aid, identifier, text = match[0]
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identifier = identifier.rstrip(' ')
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parsed.update({
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'format': 'announcement',
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'message_text': text,
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'aid': aid,
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'identifier': identifier
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})
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break
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# validate addresse
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match = re.findall(r"^([a-zA-Z0-9 \-]{9}):(.*)$", body)
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if not match:
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raise ParseError("invalid addresse in message", raw_sentence)
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addresse, body = match[0]
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parsed.update({'addresse': addresse.rstrip(' ')})
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# check if it's a telemetry configuration message
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match = re.findall(r"^(PARM|UNIT|EQNS|BITS)\.(.*)$", body)
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if match:
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logger.debug("Attempting to parse telemetry-message packet")
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form, body = match[0]
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parsed.update({'format': 'telemetry-message'})
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if form in ["PARM", "UNIT"]:
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vals = body.split(',')[:13]
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for val in vals:
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if not re.match(r"^(.{1,20}|)$", val):
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raise ParseError("incorrect format of %s (name too long?)" % form, raw_sentence)
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defvals = [''] * 13
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defvals[:len(vals)] = vals
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parsed.update({
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't%s' % form: defvals
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})
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elif form == "EQNS":
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eqns = body.split(',')[:15]
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teqns = [0, 1, 0] * 5
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for idx, val in enumerate(eqns):
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if not re.match("^([-]?\d*\.?\d+|)$", val):
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raise ParseError("value at %d is not a number in %s" % (idx+1, form), raw_sentence)
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else:
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try:
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val = int(val)
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except:
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val = float(val) if val != "" else 0
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teqns[idx] = val
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# group values in 5 list of 3
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teqns = [teqns[i*3:(i+1)*3] for i in range(5)]
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parsed.update({
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't%s' % form: teqns
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})
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elif form == "BITS":
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match = re.findall(r"^([01]{8}),(.{0,23})$", body)
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if not match:
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raise ParseError("incorrect format of %s (title too long?)" % form, raw_sentence)
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bits, title = match[0]
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parsed.update({
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't%s' % form: bits,
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'title': title
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})
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# regular message
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else:
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logger.debug("Packet is just a regular message")
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parsed.update({'format': 'message'})
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match = re.findall(r"^(ack|rej)\{([0-9]{1,5})$", body)
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if match:
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response, number = match[0]
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parsed.update({
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'response': response,
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'msgNo': number
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})
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else:
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body = body[0:70]
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match = re.findall(r"\{([0-9]{1,5})$", body)
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if match:
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msgid = match[0]
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body = body[:len(body) - 1 - len(msgid)]
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parsed.update({'msgNo': int(msgid)})
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parsed.update({'message_text': body})
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break
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# postion report (regular or compressed)
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#
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# !DDMM.hhN/DDDMM.hhW$... POSIT ( no APRS)
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# =DDMM.hhN/DDDMM.hhW$... POSIT (APRS message capable)
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# /DDHHMM/DDMM.hhN/DDDMM.hhW$... Time of last fix (No APRS)
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# @DDHHMM/DDMM.hhN/DDDMM.hhW$CSE/SPD/... Moving (with APRS)
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# @DDHHMM/DDMM.hhN/DDDMM.hhW\CSE/SPD/BRG/NRQ/.... DF report
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# ./YYYYXXXX$csT Compressed (Used in any !=/@ format)
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elif packet_type in '!=/@':
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parsed.update({"messagecapable": packet_type in '@='})
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if len(body) == 0 and 'timestamp' in parsed:
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raise ParseError("invalid position report format", raw_sentence)
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# comprossed packets start with /
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if re.match(r"^[\/\\A-Za-j][!-|]{8}[!-{}][ -|]{3}", body):
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logger.debug("Attempting to parse as compressed position report")
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if len(body) < 13:
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raise ParseError("Invalid compressed packet (less than 13 characters)", raw_sentence)
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parsed.update({'format': 'compressed'})
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packet = body[:13]
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extra = body[13:]
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symbol_table = packet[0]
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symbol = packet[9]
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latitude = 90 - (base91(packet[1:5]) / 380926)
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longitude = -180 + (base91(packet[5:9]) / 190463)
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# parse csT
|
|
|
|
# converts the relevant characters from base91
|
|
c1, s1, ctype = [ord(x) - 33 for x in packet[10:13]]
|
|
|
|
if c1 == -1:
|
|
parsed.update({'gpsfixstatus': 1 if ctype & 0x20 == 0x20 else 0})
|
|
|
|
if -1 in [c1, s1]:
|
|
pass
|
|
elif ctype & 0x18 == 0x10:
|
|
parsed.update({'altitude': (1.002 ** (c1 * 91 + s1)) * 0.3048})
|
|
elif c1 >= 0 and c1 <= 89:
|
|
parsed.update({'course': 360 if c1 == 0 else c1 * 4})
|
|
parsed.update({'speed': (1.08 ** s1 - 1) * 1.852}) # mul = convert knts to kmh
|
|
elif c1 == 90:
|
|
parsed.update({'radiorange': (2 * 1.08 ** s1) * 1.609344}) # mul = convert mph to kmh
|
|
|
|
|
|
# normal position report
|
|
else:
|
|
logger.debug("Attempting to parse as normal position report")
|
|
parsed.update({'format': 'uncompressed'})
|
|
|
|
try:
|
|
(
|
|
lat_deg,
|
|
lat_min,
|
|
lat_dir,
|
|
symbol_table,
|
|
lon_deg,
|
|
lon_min,
|
|
lon_dir,
|
|
symbol,
|
|
extra
|
|
) = re.match(r"^(\d{2})([0-9 ]{2}\.[0-9 ]{2})([NnSs])([\/\\0-9A-Z])(\d{3})([0-9 ]{2}\.[0-9 ]{2})([EeWw])([\x21-\x7e])(.*)$", body).groups()
|
|
|
|
# TODO: position ambiguity
|
|
|
|
# validate longitude and latitude
|
|
|
|
if int(lat_deg) > 89 or int(lat_deg) < 0:
|
|
raise ParseError("latitude is out of range (0-90 degrees)", raw_sentence)
|
|
if int(lon_deg) > 179 or int(lon_deg) < 0:
|
|
raise ParseError("longitutde is out of range (0-180 degrees)", raw_sentence)
|
|
"""
|
|
f float(lat_min) >= 60:
|
|
raise ParseError("latitude minutes are out of range (0-60)", raw_sentence)
|
|
if float(lon_min) >= 60:
|
|
raise ParseError("longitude minutes are out of range (0-60)", raw_sentence)
|
|
|
|
the above is commented out intentionally
|
|
apperantly aprs.fi doesn't bound check minutes
|
|
and there are actual packets that have >60min
|
|
i don't even know why that's the case
|
|
"""
|
|
|
|
# convert coordinates from DDMM.MM to decimal
|
|
|
|
latitude = int(lat_deg) + (float(lat_min) / 60.0)
|
|
longitude = int(lon_deg) + (float(lon_min) / 60.0)
|
|
|
|
latitude *= -1 if lat_dir in 'Ss' else 1
|
|
longitude *= -1 if lon_dir in 'Ww' else 1
|
|
|
|
except:
|
|
# failed to match normal sentence sentence
|
|
raise ParseError("invalid format", raw_sentence)
|
|
|
|
# include symbol in the result
|
|
|
|
parsed.update({
|
|
'symbol': symbol,
|
|
'symbol_table': symbol_table
|
|
})
|
|
|
|
# include longitude and latitude in the result
|
|
|
|
parsed.update({'latitude': latitude, 'longitude': longitude})
|
|
|
|
# attempt to parse remaining part of the packet (comment field)
|
|
|
|
# try CRS/SPD/
|
|
|
|
match = re.findall(r"^([0-9]{3})/([0-9]{3})", extra)
|
|
if match:
|
|
cse, spd = match[0]
|
|
extra = extra[7:]
|
|
parsed.update({
|
|
'course': int(cse),
|
|
'speed': int(spd)*1.852 # knots to kms
|
|
})
|
|
|
|
# try BRG/NRQ/
|
|
match = re.findall(r"^([0-9]{3})/([0-9]{3})", extra)
|
|
if match:
|
|
brg, nrq = match[0]
|
|
extra = extra[7:]
|
|
parsed.update({'bearing': int(brg), 'nrq': int(nrq)})
|
|
|
|
#TODO parse PHG
|
|
|
|
# try find altitude in comment /A=dddddd
|
|
match = re.findall(r"^(.*?)/A=(\-\d{5}|\d{6})(.*)$", extra)
|
|
|
|
if match:
|
|
extra, altitude, post = match[0]
|
|
extra += post # glue front and back part together, DONT ASK
|
|
|
|
parsed.update({'altitude': int(altitude)*0.3048})
|
|
|
|
extra, telemetry = _parse_comment_telemetry(extra)
|
|
parsed.update(telemetry)
|
|
|
|
if len(extra) > 0 and extra[0] == "/":
|
|
extra = extra[1:]
|
|
|
|
parsed.update({'comment': extra})
|
|
else:
|
|
raise UnknownFormat("format is not supported", raw_sentence)
|
|
|
|
logger.debug("Parsed ok.")
|
|
return parsed
|
|
|
|
|
|
def _parse_comment_telemetry(text):
|
|
"""
|
|
Looks for base91 telemetry found in comment field
|
|
Returns [remaining_text, telemetry]
|
|
"""
|
|
match = re.findall(r"^(.*?)\|([!-{]{2,14})\|(.*)$", text)
|
|
if match and len(match[0][1]) % 2 == 0:
|
|
text, telemetry, post = match[0]
|
|
text += post
|
|
|
|
temp = [''] * 7
|
|
for i in range(7):
|
|
try:
|
|
temp[i] = base91(telemetry[i*2:i*2+2])
|
|
temp[i] = int(temp[i]) if temp[i].is_integer() else temp[i]
|
|
except:
|
|
continue
|
|
|
|
parsed = {
|
|
'telemetry': {
|
|
'seq': temp[0],
|
|
'vals': temp[1:6]
|
|
}
|
|
}
|
|
|
|
if temp[6] != '':
|
|
parsed['telemetry'].update({
|
|
'bits': "{0:08b}".format(int(temp[6]))
|
|
})
|
|
|
|
return [text, parsed]
|
|
else:
|
|
return [text, {}]
|