What could I have done wrong when updating Complications from my App?

When do you publish?  Must the widget be open and running?  For my weather ones, I have a background service that runs every "X" (configurable) minutes.

If you run your widget in the sim. and look under simulation>complications, you'll see what you publish and the current value.

Publishing is a bit tricky, in that the XML for complications used can only be included on devices with complications.  What does your xml for this look like?

I have the following XML:

<complications> 
    <complication id="0" access="public" 
                  longLabel="@Strings.tempecowitt" 
                  shortLabel="@Strings.temp" 
                  glancePreview="true" 
                  icon = "@Drawables.ThermometerIcon"> 
        <faceIt defaultText="EcowittTemperatur" /> 
        <range> 
        </range> 
    </complication> 
    <complication id="1" access="public" 
                  longLabel="@Strings.windecowitt" 
                  shortLabel="@Strings.wind" 
                  glancePreview="false" 
                  icon = "@Drawables.WindIcon"> 
        <faceIt defaultText="EcowittWind" /> 
        <range> 
        </range> 
    </complication> 
</complications>

I publish it once, when the widget is loaded.

My device is a Venu2, it is capable of using Complications....

what do you see in the sim when you run your widget under simulation>complications?

Here's what I see with one of mine that publishes 4

And if I select one, I see what's published for it

I see two Complications with the names I set, the Icons I set but instead of the values I published, I see "--" but the code that would publish "--" was never executed because it has a print statement before it, and I do not see the output of that print....

Sound like you're not publishing when you think you are.  Add some println calls in your widget, run it in the sim, and see what it's doing/not doing

Requiring the user to run your widget so the watch face updates can be improved with a background service.

By the way, the weather station I'm showing in the sim is actually an ecowitt one.  It uploads data to WU.

My app uses the Ecowitt API directly instead of WU. Once the publishing works, I'll also implement a background service, but I first need to get it to work in foreground....

I added print calls and they were executed properly....

That is a bit strange....

Try a different target device just in case.  Mine works fine for me on a venu2

Induce a typo in your xml for complications, so you can make sure it's being used.

Here's how I publish temperature if it's not null

I have the following code for publishing the Complications:

var oTempNum=outdoor["temperature"]["value"].toNumber();
System.print("Temp.: ");
System.println(oTempNum);
Complications.updateComplication(
0,
{
  "value" => oTempNum,
  "units" => Complications.UNIT_TEMPERATURE,
}
);
var wSpNum=wind["wind_gust"]["value"].toNumber()/3.6;
System.print("Wind: ");
System.println(wSpNum);
Complications.updateComplication(
1,
{
  "value" => wSpNum,
  "units" => Complications.UNIT_SPEED,
}
);

I tried inducing a typo into the XML and it threw an error when building, so it is definitely being used.

The XML file is named complications.xml and I placed it in the resources folder. It has the following content:

<complications>
    <complication id="0" access="public"
                  longLabel="@Strings.tempecowitt"
                  shortLabel="@Strings.temp"
                  glancePreview="true"
                  icon = "@Drawables.ThermometerIcon">
        <faceIt defaultText="EcowittTemperatur" />
        <range>
        </range>
    </complication>
    <complication id="1" access="public"
                  longLabel="@Strings.windecowitt"
                  shortLabel="@Strings.wind"
                  glancePreview="false"
                  icon = "@Drawables.WindIcon">
        <faceIt defaultText="EcowittWind" />
        <range>
        </range>
    </complication>
</complications>

I also tried building for a Venu3 and running that in the simulator but it was the same (see screenshots):

I just tried your publisher app, and it worked, at least on the Forerunner 965...

I also tried adding the Venu 2 and running it on that, which does not work (the option "complications" in the sim is greyed out and not cklickable...

When I ran my app on that Forerunner 965 (now without units and publishing Strings), it doesn't work at all and shows "--" for one and "-" for the other complication. I searched for "-" and "--" in all my app files and they were not found anywhere that had to do with complications...

I don't really know what to do now...