[Bug 1971737] [NEW] EPICS 3.13 clients cannot connect to EPICS 7 or 3.16

[Dirk Zimoch via Core-talk <core-talk at aps.anl.gov>]

Public bug reported:

Since commit 95fd255d "rsrv: ignore CA client version older than v4.4"
from Jul 30 2016, EPICS 3.13 clients cannot connect any more, even their
CA version is V4.8.

The reason is that camessage drops the incoming CA_PROTO_SEARCH messages
because the 3.13 client has not yet sent a CA_PROTO_VERSION message and
thus the code reads client->minor_version_number as 0.

This is a huge hindrance for upgrading 3.14 IOCs to EPICS 7 when there
are still 3.13 IOC (which cannot be upgraded yet) in the network which
need to connect.

** Affects: epics-base
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1971737

Title:
  EPICS 3.13 clients cannot connect to EPICS 7 or 3.16

Status in EPICS Base:
  New

Bug description:
  Since commit 95fd255d "rsrv: ignore CA client version older than v4.4"
  from Jul 30 2016, EPICS 3.13 clients cannot connect any more, even
  their CA version is V4.8.

  The reason is that camessage drops the incoming CA_PROTO_SEARCH
  messages because the 3.13 client has not yet sent a CA_PROTO_VERSION
  message and thus the code reads client->minor_version_number as 0.

  This is a huge hindrance for upgrading 3.14 IOCs to EPICS 7 when there
  are still 3.13 IOC (which cannot be upgraded yet) in the network which
  need to connect.

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