Experimental Physics and
Industrial Control System

Freddie Akeroyd - STFC UKRI via Tech-talk <tech-talk at aps.anl.gov> · Fri, 10 Jun 2022 13:32:07 +0000

I mean     outTerminator = CR LF;     of course

Freddie

> -----Original Message-----
> From: Akeroyd, Freddie (STFC,RAL,ISIS)
> Sent: 10 June 2022 14:31
> To: Gregory, Chris (STFC,RAL,CLF) <christopher.gregory at stfc.ac.uk>
> Cc: tech-talk at aps.anl.gov
> Subject: RE: StreamDevice with a REST API
> 
> Hi Chris,
> 
> I think I read somewhere that HTTP/1.1 defined CR LF as the end-of-line
> marker? So maybe
> 
>  	  outTerminator = CF LF;
>  	  replyTimeout = 5000;
>  	  out "GET
>  http://<my_ip_address>:8001/REST/HTTP_CMD/?RDVAR/State HTTP/1.1";
>                  out "";
>  	  in "%#s";
> 
> Regards,
> 
> Freddie
> 
> > -----Original Message-----
> > From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Chris
> > Gregory
> > - STFC UKRI via Tech-talk
> > Sent: 10 June 2022 14:10
> > To: tech-talk at aps.anl.gov
> > Subject: StreamDevice with a REST API
> >
> > I'm writing an IOC for a device that has a REST API. Replies are
> > simple and predictable so I'm hoping that I won't need anything more
> > complex than StreamDevice.
> >
> > At the moment I can't get a reply from the device. In my dev setup I'm
> > running the IOC under WSL2, with the device software running on the
> > Windows host on port 8001. The port is open in the firewall. Would
> > anyone have any pointers please? (I've subbed my real Windows host ip
> > address with <my_ip_address> in the below but in the application I've
> > got the full address written out.)
> >
> >
> > Protocol:
> > 	read_variable{
> > 	  outTerminator = LF LF;
> > 	  replyTimeout = 5000;
> > 	  out "GET
> > http://<my_ip_address>:8001/REST/HTTP_CMD/?RDVAR/State HTTP/1.1";
> > 	  in "%#s";
> > 	}
> >
> > Record:
> > 	record (stringin, "RDV_TEST") {
> >  	  field(DTYP, "stream")
> >   	  field(INP, "@eksplaAPL038.proto read_variable() $(PORT)")
> >  	  field(SCAN, "5 second")
> > 	}
> >
> >
> > PORT configuration in st.cmd:
> > 	drvAsynIPPortConfigure("$(PORT)", "<my_ip_address>:8001
> > HTTP",0,0,0)
> >
> >
> > When I run the IOC the asynTraceMask shows that I'm sending what I
> > expect, but I don't get any reply. E.g.
> > 	epics> 2022/06/10 13:40:59.703 <my_ip_address>:8001 HTTP write
> > 67
> > 	GET http://<my_ip_address>:8001/REST/HTTP_CMD/?RDVAR/State
> > HTTP/1.1\n\n
> >
> >
> > Using telnet from WSL2 with the same ip:port the following both
> > succeed and get the expected reply from the device:
> > 	GET http://<my_ip_address>:8001/REST/HTTP_CMD/?RDVAR/State
> > HTTP/1.1
> > 	or
> > 	GET /REST/HTTP_CMD/?RDVAR/State HTTP/1.1
> >
> >
> > I've tried the following "out" commands in the protocol file. No reply
> > in any
> > case:
> > 	out "GET
> > http://<my_ip_address>:8001/REST/HTTP_CMD/?RDVAR/State HTTP/1.1";
> > 	out "GET
> > http://<my_ip_address>:8001/REST/HTTP_CMD/?RDVAR/State";
> > 	out "GET /REST/HTTP_CMD/?RDVAR/State HTTP/1.1";
> > 	out "GET /REST/HTTP_CMD/?RDVAR/State";
> >
> > I'd be grateful for any help,
> > Chris
> >
> >
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System