SPINEL_PROP_CNTR_MAC_RETRY_HISTOGRAM value

MAC retry histogram. Format: t(A(L))t(A(L)) Required capability: SPINEL_CAP_MAC_RETRY_HISTOGRAM The contents include two structs, first one is histogram which corresponds to retransmissions number of direct messages, second one provides the histogram of retransmissions for indirect messages. The first structure includes: 'L': DirectRetry[0] (The number of packets after 0 retry). 'L': DirectRetry[1] (The number of packets after 1 retry). ... 'L': DirectRetry[n] (The number of packets after n retry). The size of the array is OPENTHREAD_CONFIG_MAC_RETRY_SUCCESS_HISTOGRAM_MAX_SIZE_COUNT_DIRECT. The second structure includes: 'L': IndirectRetry[0] (The number of packets after 0 retry). 'L': IndirectRetry[1] (The number of packets after 1 retry). ... 'L': IndirectRetry[m] (The number of packets after m retry). The size of the array is OPENTHREAD_CONFIG_MAC_RETRY_SUCCESS_HISTOGRAM_MAX_SIZE_COUNT_INDIRECT. Writing to this property with any value would reset MAC retry histogram.