otMeshDiagRouterInfo::mLinkQualities field

Provides the link quality from this router to other routers, also indicating whether a link is established between the routers. The array is indexed based on Router ID. `mLinkQualities[routerId]` indicates the incoming link quality, the router sees to the router with `routerId`. Link quality is a value in [0, 3]. Value zero indicates no link. Larger value indicate better link quality (as defined by Thread specification).