Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Tue, 27 Apr 2021 07:37:36 -0700

On 4/27/21 2:43 AM, Stainer Tom via Tech-talk wrote:
> Thanks Ralph for your response. Point noted on the gateways & proxies.
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> For my simple example, to follow up, **pvlist** does not work (for me) without any arguments – it returns nothing.
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> /    $ pvlist/
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> /    # returns nothing/

"pvlist" uses a UDP broadcast for discovery, so it will only find servers
which are accessible on an attached subnet.

> If I instead run it with the IP address of the server, it does indeed return the full list of PVs – all 1000 of them 😊.
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>     /$ pvlist 192.168.1.XX/
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> /    # prints all PVs from that IP (takes only one port though)/
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> However, if I have two servers running on the same machine then the above only returns the list from one server (in my case port 5075, not the port of the second server - 51992). This seems to match with what I can see in the code:
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>     /// TODO for now we take only first server address/
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> /    serverAddress = inetAddressToString(entry.addresses[0]);/
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> It seems pvlist.cpp is a good place for me to start in order to understand how this mechanism works.
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> I noticed no equivalent **calist** tool exists, is there a specific reason for this?
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> Kind regards,
> 
> Tom
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System