Connectivity Framework Annex A : Assessment Template : DDS
A . 6.4 Functional Viewpoint A . 6.4.2 Core Transport Layer Functions
Messaging Protocol ( Section 5.1.1 )
Communication Modes ( Section 5.1.2 )
Endpoint Addressing
( Section 5.1.3 )
Connectedness ( Section 5.1.4 )
Prioritization ( Section 5.1.5 )
Timing & Synchronization ( Section 5.1.6 )
Message Security ( Section 5.1.7 )
Does it require UDP or TCP ? What are the salient aspects of the messaging protocol ? What are the message size limitations ? What are the usage assumptions ? Is it optimized for certain message requirements ?
The DDS messaging protocol ( DDSI-RTPS v2.2 ) assumes connectionless ( UDP ) messaging . The messaging protocol can allow messages larger than the UDP ( 64kB ) limit . The protocol is designed to support widely varying message sizes .
DDS implementations can also support TCP . There is an ongoing effort to standardize the mapping under the auspices of the TCP / IP DDSI-RTPS specification . Which communication modes does it support ? DDS supports both unicast ( default ) and multicast ( when available ).
Describe the transport endpoints . How are the endpoints addressed ? What are the limitations , if any , on the number of endpoints ?
DDS transport endpoints correspond to a DDS-DataWriter and DDS-DataReader . The endpoints are addressed using a globally unique ID ( GUID ) for the endpoints . The number of endpoints within a domain is bounded by the number of unique GUIDs . Does it require a connected circuit between the endpoints ? Summarize the salient aspects .
No , DDS does not require a connected circuit between the endpoints . Does it provide a means to prioritize messages ? Summarize the salient aspects . Yes , DDS provides a means to prioritize messages . Does it provide the ability to synchronize time ? Summarize the salient aspects .
No , DDS does not provide a way to synchronize time between endpoints . In systems using DDS , this is typically accomplished using a separate time synchronization protocol . Does it provide mechanisms for message security ? Summarize the salient aspects .
Yes , DDS provides mechanisms for message security . It provides support for authentication of endpoints , message encryption and message integrity .
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