Update 1300 1302 handling

[semuadmin]

pyrtcm Pull Request Template

Description

1. Refine handling of string attributes (e.g. DF140, DF563, DF566).
2. Add optional 'parsed' argument to RTCMReader - 1 = return raw and parsed data, 0 = return only raw data (parsed will be None)
3. Temporarily suppress 1302 test cases NB: currently, sample 1302 messages from euref-ip.net:2101/EUREF01 appear to be truncated (to 59 bytes), causing a Error processing attribute 'group-DF568' in message type 1302 negative shift count exception; this mountpoint's data stream also causes the BNC 2.13.1 NTRIP client to bomb every time, so possibly an issue with the source implementation or documentation???

Fixes object has no attribute 'DF569' error when parsing 1302 messages - BUT see known issue above

Testing

Please test all changes, however trivial, against the supplied pytest suite tests/test_*.py. Please describe any test cases you have amended or added to this suite to maintain >= 99% code coverage.

• Tests updated in test_stream.py

Checklist:

• I agree to abide by the code of conduct (see CODE_OF_CONDUCT.md).
• My code follows the style guidelines of this project (see CONTRIBUTING.md).
• I have performed a self-review of my own code.
• (if appropriate) I have cited my RTCM documentation source(s).
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• (if appropriate) I have added test cases to the tests/test_*.py unittest suite to maintain >= 99% code coverage.
• I have tested my code against the full tests/test_*.py unittest suite.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I have signed my commits.
• I understand and acknowledge that the code will be published under a BSD 3-Clause license.