http command

[kjakan]

Hi!

Is it possible to send a http command to a plc? In the style of:

http://remote:remote@IP/scada-remote?m=json&r=grp&fn=write&alias=34/1/2&value=1

Thnks for fantastic software!

[manjey73]

Try to figure out the DrvHttpNotif driver, maybe it will solve your problem when sending an arbitrary command

[kjakan]

Thanks! Seems to be the right direction, but haven’t figured out how to use it yet.

example: http://remote:remote@http://192.68.1.23//scada-remote?m=json&r=grp&fn=write&alias={grp}&value={value}

Generated three channels of this device, requests, notifications and response status..

I guess there is a way to pass the parameteres GRP and VALUE through the formula field of the request channel? Or maybe I miss something substantial in the process? Will try more tomorrow…

[manjey73]

If you need to send and receive some value, it may not be suitable. Or make different queries for a certain number of values.
To be honest, I have not used this driver for such a task. I made my own based on this driver for solving my specific task.

But it seems that this is the only driver for working with http as part of Scada

[Mikhail]

Hi,
With DrvHttpNotif you can send any parameters using GET or POST request.
You should send a command having the code Request and text like
grp=value1
value=value2

[Mikhail]

First of all, try sending command from the device data page (in Communicator settings). Provide screenshots if it doesn’t work.

[kjakan]

Shure it works if done right..But’s that obviously not what I’m doing 😉

headers page is blank
content page is blank

gets error..

In a webbrowser from same computer this works:
http://remote:Hovdetjenn18@10.147.19.135/scada-remote?m=json&r=grp&fn=write&alias=63/7/200&value=34

• This reply was modified 1 year, 10 months ago by kjakan.

[Mikhail]

Thank you.
Could you also provide a screenshot of the communication line log when you send a command?

[kjakan]

[Mikhail]

I will check.

[Mikhail]

Cannot reproduce: https://ibb.co/S0sW3Tm

My DrvHttpNotif_XXX.xml is

<?xml version="1.0" encoding="utf-8"?>
<NotifDeviceConfig>
  <Uri>http://remote:Hovdetjenn18@10.147.19.135/scada-remote?m=json&amp;r=grp&amp;fn=write&amp;alias={grp}&amp;value={value}</Uri>
  <Method>Get</Method>
  <Headers />
  <Content />
  <ContentType />
  <ContentEscaping>None</ContentEscaping>
  <ParamEnabled>true</ParamEnabled>
  <ParamBegin>{</ParamBegin>
  <ParamEnd>}</ParamEnd>
  <AddrSep>;</AddrSep>
</NotifDeviceConfig>

Command string data:

value=34
grp=63/7/200

• This reply was modified 1 year, 10 months ago by Mikhail.

[Mikhail]

Try simplifying the request and arguments to find the error cause.

[Mikhail]

Check the device timeout. It should be > 0.

[kjakan]

Thanks! Device timeout=0 was the error!

[kjakan]

And the username/password had to be given via headers:

Name: Authorization
Value: Basic //Base64 encoded username:password//

[Author]

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