Optional props: Partial<{ Optional channelOptional channelWhich channel type, RtmChannelType_STREAM or message
Optional intervalOnly valid when in interval mode
Optional publisherThe user who triggered this event.
Optional snapshotOnly valid when receive snapshot event
Optional stateThe states count
Optional stateThe user states
Optional timestampRTM server UTC time
Optional typeIndicate presence event type
The channel which the presence event was triggered