[lowpan][lowpan-spinel-driver] Implemented `send_mfg_command()`

This change implements the new `send_mfg_command()` method
on the LoWPAN Spinel Driver.

Additionally, some minor additions were made to the `spinel_pack`
library to allow strings to be more easily passed as "set property"
values.

Test: fx test lowpan-tests
Change-Id: If35593dd28f3db8e749afb522ec9dd190e0a7e96
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/393235
Commit-Queue: Robert Quattlebaum <rquattle@google.com>
Reviewed-by: Jiaming (Charlie) Wang <jiamingw@google.com>
Testability-Review: Jiaming (Charlie) Wang <jiamingw@google.com>
3 files changed
tree: cdb207d41c9a7e3c6dc4484cd264b3874803a06e
  1. boards/
  2. build/
  3. bundles/
  4. cts/
  5. docs/
  6. examples/
  7. garnet/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. AUTHORS
  22. BUILD.gn
  23. CODE_OF_CONDUCT.md
  24. CONTRIBUTING.md
  25. LICENSE
  26. OWNERS
  27. PATENTS
  28. README.md
  29. rustfmt.toml
README.md

Fuchsia

Pink + Purple == Fuchsia (a new operating system)

What is Fuchsia?

Fuchsia is a modular, capability-based operating system. Fuchsia runs on modern 64-bit Intel and ARM processors.

Fuchsia is an open source project with a code of conduct that we expect everyone who interacts with the project to respect.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.