Add ubx save/load functionality

[semuadmin]

pygnssutils Pull Request Template

Description

Add two new CLI utilities ubxload and ubxsave which allow user to save and reload the current configuration of a Gen 9+ UBX GNSS device. The ubxsave utility works by polling a complete set of CFG-VALGET keys from the UBX Configuration Database, converting the responses to CFG-VALSET commands and saving these as binary UBXMessages. The ubxload utility loads these CFG-VALSET messages from a file and uploads them to the receiver's volatile memory (RAM) memory layer. The two utilities provide an easy way to copy configurations between compatible devices.

Fixes # (issue)

Testing

Please test all changes, however trivial, against the supplied unittest suite tests/test_*.py e.g. by executing the tests/testsuite.py module or using your IDE's native Python unittest integration facilities. Please describe any test cases you have amended or added to this suite to maintain >= 99% code coverage.

• Tested with a variety of Gen9+ devices

Checklist:

• 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 u-blox 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 understand and acknowledge that the code will be published under a BSD 3-Clause license.