Evaluate Condition based on file

[airmax-b3]

I'd like to use the information in a file to evaluate if a condition is true or not. Is this possible with linknx?

Background: My SolarLog 500 System writes its current power (which is linearly dependent to solar radiation) in a file on a webserver every 10  minutes. I'd like to use this value, to decide weather to close the blinds or not.

[uidas]

You can create a script that monitor the file and write the current power to linknx through XML interface.

The script I use with Asus WL500GPv1 (OpenWRT Kamikaze 7.09)

    #!/bin/sh
    objectid=init
    objectvalue=1
    XMLresponse=$(printf "<write><object id='"$objectid"'  value='"on"'/></write>\n\x4"  | /usr/bin/nc -c 127.0.0.1 1028 )
    while ; do
        sleep 1
        XMLresponse=$(printf "<write><object id='"$objectid"' value='"$objectvalue"'/></write>\n\x4"  | /usr/bin/nc -c 127.0.0.1 1028 )
    done

    # uncomment echos for debug
    # request status. success or error
    #XMLrespstatus=$(echo $XMLresponse | /bin/sed "s/<write status='\(*\)'.*./\1/"  | /usr/bin/head -n 1)

    # Error description
    #if ; then
    #       XMLrespstring=$(echo $XMLresponse | /bin/sed "s/<write status='error'>\(.*\)<\/write>/\1/"  | head -n 1)
    #else
    #        XMLrespstring=''
    #fi

    #echo response: $XMLresponse
    #echo status: $XMLrespstatus
    #echo string: $XMLrespstring

In Suse Linux Enterprise Server I use  netcat  127.0.0.1 1028 (without -c)

[jef2000]

Hi,

To set an object value based on file content, you can use a LUA script  like this:

       

        <rule id="solar-power">
                <condition type="timer" trigger="true">
                    <every>10m</every>
                </condition>
                <actionlist>
                    <action type="script"><![CDATA[
    file = io.open("solarpower.txt", "r");
    power = file:read("*n");
    - print ("Power is ::" .. power .. "::\n") ;
    file:close();
    if (power > 1500) then
        set("blinds", 1);
    end
    if (power < 500) then
        set("blinds", 0);
    end
    ]]>
                    </action>
                </actionlist>
            </rule>

Regards,

Jean-François

[jef2000]

Hi,

Since the previous message was severely mutilated by Sourceforge editor, I'll try again.

To set an object value based on file content, you can use a LUA script like this:

        <rule id="solar-power">
            <condition type="timer" trigger="true">
                <every>10m</every>
            </condition>
            <actionlist>
                <action type="script"><![CDATA[
                file = io.open("solarpower.txt", "r");
                power = file:read("*n");
                - print ("Power is ::" .. power .. "::\n") ;
                file:close();
                if (power > 1500) then
                    set("blinds", 1);
                end
                if (power < 500) then
                    set("blinds", 0);
                end
                ]]>
                </action>
            </actionlist>
        </rule>

Regards,

Jean-François

[jef2000]

The preview text looks good, but once submitted the text is wrong.

You need to replace < by < , > by > and  " by " to get the original text. Thanks Sourceforge.

[airmax-b3]

Thank you - the is code shown correctly in the e-mail notification that I received.