Need to pull an integer value for dimmer instead of percent

[Joshua]

Disclosure... I'm posting this in the openHAB forums here

How can I convert the dimmer value from a decimal to an integer in paper UI or items? The image attached shows the paper white configuration. The Dimmer\:%s between 0 and 100 is required to trigger the dimmer with the MQTT ESP module I’m using.

Here's a working MQTT 1 item

//ESP Dimmer 3 Switch
Switch ESP03Switch "Hall Light" <light> (All,Random_Switches)        {mqtt=">[mosquitto:/esp/dimmer03/sub:command:on:R13_ON],>[mosquitto:/esp/dimmer03/sub:command:off:R13_OFF]"}
//ESP Dimmer 3 Slider
Dimmer ESP03Dimmer "Hall Dimmer [%d %%]" <slider> (All,Quick_Access,Random_Dimmers,Morning,BedTime)        {mqtt=">[mosquitto:/esp/dimmer03/sub:command:*:Dimmer\\:${command}]"}

Here's what I have in Paper UI... 

and the payload is

Dimmer\\:0.82000000

The ESP needs a payload of

Dimmer\\:82

[papa]

Joshua, I believe something like the following might be a start for what you ask. I believe you need to multiply the slider's value times 100 to get an integer.

One way would be to change the dimming device's software to not only receive the slider value, but also to multiply that value times 100 before it is applied to dimming.

Another way (no changing the device software) ... I am thinking you could use THREE items, including the same Switch item plus splitting the one item for dimming into two items. One dimming item displays a slider on the UI & tracks the slider's value.  The other item will get the slider value which was converted to an integer. The rule below will send that converted value to the dimming device.  The Switch item & the ESP03Slider item will have entries in the sitemap.  The Number Dimmer3Cmd item (whose only purpose is to hold the integer which is sent to the dimming device) need NOT have a sitemap entry.

   //ESP Dimmer 3 Switch
Switch ESP03Switch "Hall Light" <light> (All,Random_Switches) {mqtt=">[mosquitto:/esp/dimmer03/sub:command:on:R13_ON],>[mosquitto:/esp/dimmer03/sub:command:off:R13_OFF]"}

   //ESP Dimmer 3 Slider for the UI, yields a decimal
Dimmer ESP03Slider "Hall Dimmer [%d %%]" <slider> (All,Quick_Access,Random_Dimmers,Morning,BedTime)

   //ESP Dimmer 3 Command, needs an integer for sending to the actual dimming device
Number Dimmer3Cmd {mqtt=">[mosquitto:/esp/dimmer03/sub:command:*:Dimmer\\:${command}]"}

// When the UI slider & its value change, this rule converts the value to an integer & sends it to the actual dimming device.

rule Dimmer3Correct
    when
        Item ESP03Slider changed // slider on UI changed
    then
        var Number prcnt = ESP03Slider.state // value from UI slider
        var Number forESP03 = prcnt * 100 // convert value to integer
        Dimmer3Cmd.sendCommand( forESP03 ) // send converted value to the ESP03 Dimmer

        logInfo("ESP03", "****Slider Percent = " + prcnt)  // debugging info for the log
        logInfo("ESP03", "****forESP03 = " + forESP03)
end

[Joshua]

Got it!... Thanks for the direction. I'll update the build post to include the result.

ITEMS

//ESP Dimmer 1 Switch
Switch ESP01Switch "Josh's Light" <light> (All,Random_Switches) { channel="mqtt:topic:2c214008:ESP01Switch" }

//ESP Dimmer 1 Dimmer
Dimmer ESP01DimmerProx "Josh's Dimmer" <slider> (All,Quick_Access,Random_Dimmers,Morning,BedTime)
Number ESP01Dimmer "Josh's Dimmer" { channel="mqtt:topic:2c214008:ESP01Dimmer" }


RULES

rule "Set ESP Dimmer to 99 from 100"
when
Item ESP01Dimmer changed to 100
then
sendCommand(ESP01Slider, 99)
end

// When the UI slider & its value change, this rule converts the value to an integer & sends it to the actual dimming device.
rule "Dimmer1Correct"
when
Item ESP01DimmerProx changed // slider on UI changed
then
var Number prcnt = ESP01DimmerProx.state // value from UI slider
var Number forESP01 = prcnt // convert value to integer
ESP01Dimmer.sendCommand( forESP01 ) // send converted value to the ESP01 Dimmer
//logInfo("ESP01", "****Slider Percent = " + prcnt) // debugging info for the log
//logInfo("ESP01", "****forESP03 = " + forESP01)
end

[papa]

You are welcome, Joshua. I'm glad if I helped.

    Some questions...

        In the last, largest rule you posted above:

var Number prcnt = ESP01DimmerProx.state // value from UI slider
var Number forESP01 = prcnt // convert value to integer
ESP01Dimmer.sendCommand( forESP01 ) // send converted value to the ESP01 Dimmer

Would that not mean that the value from the UI slider would be sent to dimmer WITH NO CHANGE?

        Do you not need to multiply prcnt by 100 as I did in this line?

var Number forESP01 = prcnt * 100 // convert value to integer

[Joshua]

There's some voodoo doing on down stream. I added a channel for the proxy Dimmer for you to see the MQTT payload. I worked it out by trial and error. Different types of channel combinations with different types of things. I believe the difference is worked out by one item being a dimmer and the other a number. 

//ESP Dimmer 1 Dimmer
Dimmer ESP01DimmerProx "Josh's Dimmer" <slider> (All,Quick_Access,Random_Dimmers,Morning,BedTime) { channel="mqtt:topic:2c214008:ESP01DimmerProx" }
Number ESP01Dimmer "Josh's Dimmer" { channel="mqtt:topic:2c214008:ESP01Dimmer" }

The top payload is from ESP01DimmerProx  and the bottom is ESP01Dimmer

[papa]

OK so the Dimmer item sends a percentage/decimal and (via the rule) the Number item sends an integer.  Interesting.

        /ESP Dimmer 1 Dimmer
Dimmer ESP01DimmerProx "Josh's Dimmer" <slider> (All,Quick_Access,Random_Dimmers,Morning,BedTime) { channel="mqtt:topic:2c214008:ESP01DimmerProx" }
Number ESP01Dimmer "Josh's Dimmer" { channel="mqtt:topic:2c214008:ESP01Dimmer" }

So the longer rule above does not need to multiply prcnt times 100 to get an integer.

    That may mean the rule could be shortened some:

// When the UI slider & its value change, this rule makes sure an integer is sent to the actual dimming device.
rule "Dimmer1Correct"
    when
        Item ESP01DimmerProx changed //     slider on UI changed state
    then
        var Number forESP01 prcnt = ESP01DimmerProx.state // value from UI slider,   ?? already an integer ??
                //  var Number forESP01 = prcnt // convert value to integer                        <<  ?? disable/delete this line ??
        ESP01Dimmer.sendCommand( forESP01 ) // send integer value to the ESP01 Dimmer
                //logInfo("ESP01", "****Slider Percent = " + prcnt) // debugging info for the log   << ?? delete this line ??
        //logInfo("ESP01", "****forESP03 = " + forESP01)
end

[Joshua]

Here are the leaner rules. I had to update the "Set ESP Dimmer to 99 from 100" to include the new items.

rule "Set ESP Dimmer to 99 from 100"
when  
Item ESP01DimmerProx changed to 100
then  
sendCommand(ESP01DimmerProx, 99)
end

rule "Dimmer1Correct"
   when
       Item ESP01DimmerProx changed //     slider on UI changed state
   then
       var Number forESP01 = ESP01DimmerProx.state // value from UI slider,   ?? already an integer ??
ESP01Dimmer.sendCommand( forESP01 ) // send integer value to the ESP01 Dimmer
end

[papa]

        Leaner rules are progressing, Joshua.     How about one rule?

rule "Dimmer1Correct"
    when
         Item ESP01DimmerProx changed // slider on UI changed state
    then
        var Number forESP01 = ESP01DimmerProx.state // value from UI slider, already an integer

        if ( forESP01 == 100 ) forESP01 = 99 // catch & correct out-of-bounds value

        ESP01Dimmer.sendCommand( forESP01 ) // send integer value to the ESP01 Dimmer
end

[Joshua]

The new rule works.. Thank you for taking your time to help out.

papa: You are welcome, Joshua. So much enjoyment to work it out together.