DDS UDP Port number

用於估計要開放的UDP port

https://community.rti.com/kb/what-network-port-numbers-does-rti-connext-use

DDSI 2.2 公式

• Discovery multicast 
  • 7400 + 250 * domain_id + 0
• Data Transport multicast
  • 7400 + 250 * domain_id + 1
• Discovery unicast
  
  • 7400 + 250 * domain_id + 2 * participant_id + 10
• Data Transport unicast
  
  • 7400 + 250 * domain_id + 2 * participant_id + 11

domain_id  : 通常是固定的，依照xml檔案或者API操作

participant_id : 動態產生，依照一台電腦啟動幾個DDS App就會取得各自的數字 (類似DASK handle number)

對照VortexOpenSplice 及 VortexLite 設定 default值 

<Discovery>             <Ports>                 <Base>7400</Base>                 <DomainGain>250</DomainGain>                 <MulticastDataOffset>1</MulticastDataOffset>                 <MulticastMetaOffset>0</MulticastMetaOffset>                 <ParticipantGain>2</ParticipantGain>                 <UnicastDataOffset>11</UnicastDataOffset>                 <UnicastMetaOffset>10</UnicastMetaOffset>             </Ports> </Discovery>