Add some unit test and CommandSdFileWrite old firmware support.

[Amka78]

Add some unit test. and fix for beta release.

[jayalfredprufrock]

First great work on getting the tests in place. That's a great step forward for this project.

However, I'm confused what you are trying to accomplish with the changes to CRC handling with the SdFileWrite command? You seem to reference a version of Aurora firmware that doesn't exist yet (3.0.0), essentially disabling the CRC check for all existing versions of the firmware which is not what we want.

The CRC check is important because file writing can randomly fail and the only way to be sure corrupted data isn't getting saved is to calculate and compare the CRC. Were you having problems with SD file writing? If so, I can help debug to see what the root issue is.

[Amka78]

Off cource, I know CRC check is important. It's very hacky edit for running android app.
I try to run android app by aurora firmware version 20207, When command SdFileWrite is executed, aurora always returns value 3(Too many command arguments).
so I deleted crc option. I think firmware version 20207 has sd-file-write command bugs.
If you fix firmware bugs, my edit to SdFileWrite don't need at all.

[jayalfredprufrock]

Got it, then we need to get your Aurora updated to the latest version ASAP. Lots of breaking changes happened between 20207 and 20500 and the android app/sdk were not designed with backwards compatibility. Do you have Aurora desktop installed?

[Amka78]

I checked by latest firmware. SdFileWrite command works correct.
Please exclude my SdFileWrite modify.

[jayalfredprufrock]

Awesome, glad to hear it. I'll cherry pick everything else.