SPINEL_PROP_CNTR_ALL_IP_COUNTERS value

Thread IPv6 counters. Format: `t(LL)t(LL)` The contents include two structs, first one corresponds to all transmit related MAC counters, second one provides the receive related counters. The transmit structure includes: 'L': TxSuccess (The number of IPv6 packets successfully transmitted). 'L': TxFailure (The number of IPv6 packets failed to transmit). The receive structure includes: 'L': RxSuccess (The number of IPv6 packets successfully received). 'L': RxFailure (The number of IPv6 packets failed to receive). Writing to this property with any value would reset all IPv6 counters to zero.