New to APRS and trying to decipher the format, but the following is throwing exceptions (picked up via r/33/-97/200 t/p:

     def test_weird_frame(self):
         frame = 'DL0II>APRS,TCPIP*,qAC,T2MAZURY:=5115.19N/00658.49E&www.r09.de APRS iGate'
         aprs_frame = aprs.Frame(frame)

With the trace:

======================================================================
ERROR: test_weird_frame (tests.test_aprsframe.FrameTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/vetsin/Projects/aprs/tests/test_aprsframe.py", line 103, in test_weird_frame
    aprs_frame = aprs.Frame(frame)
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 87, in __init__
    self.parse()
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 120, in parse
    self.parse_text()
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 142, in parse_text
    self.path.append(Callsign(path))
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 258, in __init__
    self.parse(callsign)
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 293, in parse
    self.callsign.encode('hex'))
BadCallsignError: ('Could not extract callsign from %s', '54324d415a555259')

----------------------------------------------------------------------

Far as I understand the protocol thus far station DL0II received a verified qAC from an 'invalid' callsign. Are we okay with not validating >= 3x2, 3x3 callsigns?

Hello. I was trying to install this, but receive the following error

C:\Logs>pip install aprs
Collecting aprs
Using cached https://files.pythonhosted.org/packages/2b/0f/1b1975d9a265ba647b3efccf87a1ec0350cc3dabbaecd667f7831ed9f23e/aprs-7.0.0.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\geosma01\AppData\Local\Temp\pip-install-6pniz52z\aprs\setup.py", line 46, in
long_description=open('README.rst').read(),
File "c:\program files (x86)\python-32\lib\encodings\cp1252.py", line 23, in decode
return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 4443: character maps to

Command "python setup.py egg_info" failed with error code 1 in C:\Users\geosma01\AppData\Local\Temp\pip-install-6pniz52z\aprs\

I also tried from inside a Python environment with import pip, pip.main(["install","aprs"]) and got the same error.

M1GEO

The aprs module tries to do UTF-8 decoding and UTF-8 encoding, and process packets as Python unicode strings.

https://github.com/ampledata/aprs/blob/master/aprs/classes.py#L97
https://github.com/ampledata/aprs/blob/master/aprs/classes.py#L132
https://github.com/ampledata/aprs/blob/master/aprs/classes.py#L154
https://github.com/ampledata/aprs/blob/master/aprs/classes.py#L201

However, a lot of APRS packets contain byte sequences which can not be successfully decoded as UTF-8. Using UTF-8 in some text fields of APRS packets is a relatively recent invention – older software transmits various other international single-byte character sets (ISO-8859-15 and such) which will totally fail when trying to decode as UTF-8. At least one app transmits UTF-16 and a lot of trackers (including popular Kenwood radio models) emit packets with NUL bytes and other binary oddities.

If UTF-8 decoding and subsequent encoding is done, and the packet is then retransmitted, some packets will be modified by the software (or very least, the packets will be dropped if the encoding or decoding fails with an exception). If this is done on an iGate, modified duplicate packets are generated. This is very unfortunate.

Longer story on the subject:
https://github.com/hessu/aprsc/blob/master/doc/IGATE-HINTS.md#packets-getting-modified-due-to-character-encoding-issues

UTF-8 is only used in specific fields of APRS packet content: text message contents, position comment string, status string as such. The whole packet, and specifically a lot of corrupted and broken packets on the network, and packets emitted by older software, are not valid UTF-8, and igates need to treat them as byte arrays instead of unicode strings when igating, to prevent packets from getting corrupted and duplicated even more.

• Hessu, OH7LZB, of aprs.fi & aprsc

Hello,
I am trying to setup aprs module on a Raspberry pi but I have this error
AttributeError: module 'aprs' has no attribute 'parse_frame'
with this code => frame = aprs.parse_frame('xxxx')
Python 3.6.4

pip3.6 show aprs

Name: aprs
Version: 7.0.0
Summary: Python APRS Module.
Home-page: https://github.com/ampledata/aprs
Author: Greg Albrecht
Author-email: [email protected]
License: Copyright 2017 Greg Albrecht and Contributors
Location: /usr/local/lib/python3.6/site-packages
Requires: kiss, requests, bitarray

Python3.6

import aprs
Traceback (most recent call last):
File "", line 1, in
File "/home/pi/aprs.py", line 2, in
frame = aprs.parse_frame('FG4KL-3>APRS:>Hello World!')
AttributeError: module 'aprs' has no attribute 'parse_frame'
print(aprs.version)
Traceback (most recent call last):
File "", line 1, in
NameError: name 'aprs' is not defined

Many thanks for you help !

Hi, I'm new to Python so I could be doing something wrong.
I used your example replacing with my callsign and password and get the following error:

C:\Users\Mark\AppData\Local\Programs\Python\Python35-32>python aprs1.py
2016-02-04 11:55:23,764 INFO aprs.classes.connect:63 - Connected to server=rotat
e.aprs.net port=14580
2016-02-04 11:55:23,764 INFO aprs.classes.connect:63 - Connected to server=rotat
e.aprs.net port=14580
Traceback (most recent call last):
File "aprs1.py", line 4, in
a.connect()
File "C:\Users\Mark\AppData\Local\Programs\Python\Python35-32\lib\site-package
s\aprs\classes.py", line 65, in connect
self.aprsis_sock.sendall(full_auth + '\n\r')
TypeError: a bytes-like object is required, not 'str'

Currently if you use python 2.7 you have to use aprs==6.5.0 because on pypi aprs has no python version set so it always assumes the latest is correct.

Hi,

Minor bug: The APRS-IS line termination is CR+LF (spec: http://aprs-is.net/Connecting.aspx). class TCP(APRS) transmits LF+CR instead:

https://github.com/ampledata/aprs/blob/master/aprs/classes.py#L382

Most APRS-IS servers will currently accept this, but some might not.

The receiving side seems to have this right: https://github.com/ampledata/aprs/blob/master/aprs/classes.py#L407

• Hessu, develops aprsc and aprs.fi

This is with version 7.0.0 of the library.

Traceback (most recent call last):
  File "receive.py", line 2, in <module>
    import aprs
  File "/usr/local/lib/python3.5/dist-packages/aprs/__init__.py", line 33, in <module>
    from .functions import (parse_frame, parse_callsign,   # NOQA
  File "/usr/local/lib/python3.5/dist-packages/aprs/functions.py", line 120
    parsed_callsign: AprsCallsign = aprs.Callsign()
                   ^
SyntaxError: invalid syntax

Thank you for working on making APRS available through Python. I encountered problems with both the send and receive examples. I will copy the source files and results of execution below. I am using 32 bit Python 3.6.0 on Windows 10:

Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 07:18:10) [MSC v.1900 32
bit (Intel)] on win32

I executed "pip install aprs" a little earlier this evening, so everything should be fresh.

=================================================================
'''
test APRS code for receiving

from https://pypi.python.org/pypi/aprs/6.0.1
'''

import aprs

def p(x): print(x)

a = aprs.TCP('W2GMD', '12345')

a = aprs.TCP('KE0KUZ', '23990')
a.start()

a.receive(callback=p)

OUTPUT:
2017-03-26 21:27:26,391 aprs INFO aprs.classes.start:368 - Connecting to
to "('rotate.aprs.net', 14580)"
2017-03-26 21:27:26,555 aprs DEBUG aprs.classes.start:371 - Sending full
_auth=user KE0KUZ pass 23990 vers APRS Python Module filter p/KE0KUZ
Traceback (most recent call last):
File "xreceive.py", line 13, in
a.start()
File "C:\Program Files (x86)\Python36-32\lib\site-packages\aprs\classe
s.py", line 372, in start
self.interface.sendall(self._full_auth + '\n\r')
TypeError: a bytes-like object is required, not 'str'

=================================================================
'''
test APRS code for sending

from https://pypi.python.org/pypi/aprs/6.0.1
'''
import aprs

frame = aprs.Frame('KE0KUZ>APRS:>Hello World!')

a = aprs.TCP('W2GMD', '12345')

a = aprs.TCP('KE0KUZ', '23990')
a.start()

a.send(frame)

OUTPUT:
Traceback (most recent call last):
File "xsend.py", line 8, in
frame = aprs.Frame('KE0KUZ>APRS:>Hello World!')
File "C:\Program Files (x86)\Python36-32\lib\site-packages\aprs\classes.py", line 87, in init
self.parse()
File "C:\Program Files (x86)\Python36-32\lib\site-packages\aprs\classes.py", line 120, in parse
self.parse_text()
File "C:\Program Files (x86)\Python36-32\lib\site-packages\aprs\classes.py", line 132, in parse_text
for char in self.frame.decode('UTF-8'):
AttributeError: 'str' object has no attribute 'decode'

Please help!!

73!

VE3SVF

Currently this module only supports sending APRS-IS frames. It would be nice to receive them as well :).