Add the system property threadnetwork.country_code
This CL follows the guide https://source.android.com/docs/core/architecture/configuration/sysprops-apis
to add the system property API `ThreadNetworkProperties.country_code()`
to read default Thread Network country code from the system property
`threadnetwork.country_code`. OEMs use this system property
to set the different Thread country codes for the product sold in
different countries.
The Resource Overlay is not used here for the follow reasons:
<1> The default country code needs to be set to different values for
the same product selling to different countries. Resource Overlay
doesn't work here as it would require a different RRO package
for each country of of the same product.
<2> None of the other alternatives in https://source.android.com/docs/core/architecture/configuration
can fulfill the requirement.
<3> Wi-Fi and UWB uses system properties for country code, so it will
simplifies the build in factory if Thread is made consistent with
them.
Bug: b/309357909
Test: Run `atest ThreadNetworkUnitTests`.
Change-Id: Ife0c8df25df2fbe814cc6c8339c393ac0a897592
2 files changed