Represents information about a router neighbor entry from otMeshDiagQueryRouterNeighborTable().

mSupportsErrRate indicates whether or not the error tracking feature is supported and mFrameErrorRate and mMessageErrorRate values are valid. The frame error rate tracks frame tx errors (towards the child) at MAC layer, while mMessageErrorRate tracks the IPv6 message error rate (above MAC layer and after MAC retries) when an IPv6 message is dropped. For example, if the message is large and requires 6LoWPAN fragmentation, message tx is considered as failed if one of its fragment frame tx fails (for example, never acked).