Experimental Physics and Industrial Control System

Hi Mark,

> Is that length restriction in the CA protocol?  If so and you change it in your IOC then they may not work with older CA clients?

You are right for clients based on EPICS Base 3.12 (and older). There, the client library restricted channel names to 39 characters (40 byte buffer). However, EPICS Base 3.13.1 (I did not check the .0 release) already increases this limit to 1007 characters (MAX_UDP of 1024 - CA header size of 16 - 1 for the null byte).

Given the fact that EPICS Base 3.13.1 was released almost 20 years ago (November 1998), I think it is unlikely that there are still clients using that version. Anyway, the limit for these clients is 39 characters, so they would already have trouble with the 60 characters that have been allowed by EPICS Base for quite a while.

Best regards,
Sebastian

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