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<== Date ==> <== Thread ==>
Subject: Re: Channel Access questions
From: Michael Davidsaver <[email protected]>
To: [email protected]
Date: Wed, 20 May 2015 13:50:42 -0400
On 05/20/2015 11:48 AM, Goff, Steven J wrote:
... 

I thought all I would have to do is set EPICS_CA_ADDR_LIST=”192.168.2.70” and EPICS_CA_AUTO_ADDR_LIST=”NO” on the client side. And EPICS_CAS_AUTO_BEACON_ADDR_LIST=”NO”  and EPICS_CAS_BEACON_ADDR_LIST=”192.168.2.255” on the server side. Those did not work as well as some other variations I tried.


You probably want the add list to include the broadcast address of the subnet.

EPICS_CA_ADDR_LIST=”192.168.2.255”

However using wireshark all the search request from the client are using the 192.168.1.x subnet?

What am I doing wrong?


I'm not sure.  If the .1.255 subnet isn't listed, then it shouldn't be used.

 

Second Question:

Using wireshark after my client connects I see a lot of TCP responses from the server to the client of CA_PROTO_EVENT_ADD. I don’t understand these, can someone explain?


The CA message ID depend on context.  The ADD message ID is the meaning for a message sent from the client.  The same message ID is used by the server when sending data updates.

My CA dissector can distinguish (mostly) between client and server messages in this case.

https://github.com/mdavidsaver/cashark

References:
Channel Access questions Goff, Steven J
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