SubscribeEventgroup entries shall have the TTL field set to the configured value (configuration parameter SdClientTimerTTL of SdConsumedEventGroup) and the SubscribeEventgroupAck entry shall use the TTL value of the SubscribeEventgroup entry it acknowledges. SubscribeEventgroup条目应将TTL字段设置为配置值（SdConsumedEventGroup的配置参数SdClientTimerTTL），而SubscribeEventgroupAck条目应使用它所确认的SubscribeEventgroup条目的TTL值。
A StopSubscribeEventgroup (type 0x06), and SubscribeEventgroupNack (type 0x07) entry shall set the TTL field to 0x000000. StopSubscribeEventgroup（类型0x06）和SubscribeEventgroupNack（类型0x07）条目应将TTL字段设置为0x000000。
[SWS_SD_00300]⌈ Eventgroup entries shall set the Reserved fields to 0x00 and 0x000. 事件组条目应将保留字段设置为0x00和0x000。
Eventgroup entries shall carry the options as configured. 事件组条目应包含已配置的option。
