Wire specification [uint32 - protocol specification (e.g. CCL, DCCL, Protobuf, ... )][type/name/subname/subsubname][body of message (variable bytes)]

e.g. [00000000000001][MyMessage][0x2bacd34ef34...] which is 0x000000014d794d6573736167652bacd34ef34...

Protocol specification:

• protobuf = 1
• CCL = 2
• DCCL = 3
• LCM = 4

PGM (reliable multicast) Possibility

No centralized daemon; works similar to LCM

TCP / Unix Sockets Possibility

gobyd serves a local list of publishers and their applicable sockets.

• upon request it will provide the current list of publishers for a given variable type.
• applications can also subscribe to updates to the list.
• upon request it can update its list with a new publisher

Sequence of actions

1. publisher A requests new entry to gobyd for type MyMessage on socket "ipc://publisherA-MyMessage".
2. gobyd replies with acknowledgment of new entry MyMessage
3. subscriber A requests list of entries from gobyd of type MyMessage.
4. gobyd gives "ipc://publisherA-MyMessage" to subscriber A and adds subscriber A to notification list for MyMessage
5. subscriber A subscribes to "ipc://gobyd-updates" for new MyMessage publishers
6. subscriber A subscribes to "ipc://publisherA-MyMessage"
7. publisher B requests new entry to gobyd for type MyMessage on socket "ipc://publisherB-MyMessage".
8. gobyd replies with acknowledgment of new entry MyMessage
9. gobyd publishes update to all "ipc://gobyd-updates" subscribers that "ipc://publisherB-MyMessage" is providing MyMessage as well.
10. subscriber A receives update and subscribes to "ipc://publisherB-MyMessage"

Reliability? clients? gobyd?