Communication Characteristics 17 urn:oma:lwm2m:oma:17 Single Optional Maximum uplink packet size R Single Optional Integer octets Maximum downlink packet size R Single Optional Integer octets CoAP ACK_TIMEOUT RW Single Optional Integer CoAP ACK_RANDOM_FACTOR RW Single Optional Integer CoAP MAX_RETRANSMIT RW Single Optional Integer CoAP NSTART RW Single Optional Integer CoAP DEFAULT_LEISURE RW Single Optional Integer CoAP PROBING_RATE RW Single Optional Integer