Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Fri, 17 Jun 2011 16:12:04 -0500

On 6/17/11 3:44 PM, Scott Baily wrote:
> I would like to have an IOC talk to hardware that communicates
> using SOAP.  In theory, I could setup an appropriate protocol
> file for Streamdevice and use a raw TCP connection to port 80. 
> Has anyone done this?  Is there a better method?

Hi, Scott.

If you can get that to work with your particular device, that
may be the easiest solution.  I've done something similar just
using asyn records to query readings from a temperature and
humidity sensor via HTTP.

A better method, but more work, would be to actually use a SOAP
library on the IOC to communicate with the device.  Since SOAP
uses XML, you would need an XML parser which would typically be
included with or used by your SOAP library.  With your
StreamDevice approach, you are really just doing pattern
matching which is likely to work with your particular device,
but could fail given a different device implementing the same
API (e.g. XML allows whitespace characters in lots of places and
one device could place them differently than another).

While not perfect, in most situations I'd probably do something
like what you are thinking with StreamDevice (or asyn records).

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System