RE: using EPICS code with HTTP port

[Mark Rivers <rivers@cars.uchicago.edu>]

This command should be:

drvAsynIPPortConfigure("L0","10.95.101.75:80 HTTP",0,0,0)

The HTTP means that drvAsynIPPort will handle the fact that the server will disconnect after each transaction.

 

You can’t use the “curl” command in your protocol.  You need to send the actual commands that the HTTP server requires.

 

It might be something like

getData {

    out "get data";

    in "%\$1[^\r\n]";

    ExtraInput = Ignore;

}

Mark

 

 

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Ana Malagon
Sent: Monday, February 09, 2015 1:53 PM
To: tech-talk@aps.anl.gov
Subject: using EPICS code with HTTP port

 

Hi,

 

I'm trying to use EPICs with a digitizer (www.redpitaya.com) which has a web interface - I can get the information using curl to download the website information:

 

curl http://10.95.101.75/bazaar?start=spectrum

curl http://10.95.101.75/data

 

but I'm a little confused about how to integrate these commands in an ioc. I've set up a StreamDevice template, and I thought I might be able to just send the curl commands by putting them in a record:

 

record(bo, "$(P)$(R)Start")

{

    field(DESC, "Start App")

    field(DTYP, "stream")

    field(OUT, "@devREDPITAYASTREAM.proto startApp $(PORT) $(A)")

    field(ZNAM, "spectrum")

    #field(PINI, "YES")

    #field(VAL, "1")

}

 

record(waveform, "$(P)$(R)Data")

{

    field(DESC, "Data string")

    field(DTYP, "stream")

    field(INP,  "@devREDPITAYASTREAM.proto getData(20000) $(PORT) $(A)")

    field(PINI, "YES")

    field(FTVL, "CHAR")

    field(NELM, "32000")

}

with the corresponding entries in the .proto file being:

startApp {

    out "curl http://10.95.101.75/bazaar?start=%{spectrum}";

}

getData {

    out "curl http://10.95.101.75/data";

    in "%\$1[^\r\n]";

    ExtraInput = Ignore;

}

When I run st.cmd, the host is configured to be the IP address of the red pitaya itself, using the HTTP port of 80:

drvAsynIPPortConfigure("L0","10.95.101.75:80",0,0,0)

I'm not sure if this is the right thing to do? In any case, when running st.cmd with asynTraceMask enabled I get a continuous stream of "reads"

2015/02/09 11:48:23.530 10.95.101.75:80 read.

but it doesn't seem to respond to the commands I've made.

Does anyone have any feeling for using Epics with HTTP commands? 

Thanks!

Ana Malagon