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[OpenMCT Tutorial] Using only Realtime (no historical data) telemetry issue #44

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AcidLeroy opened this issue Jan 18, 2021 · 2 comments
Open

[OpenMCT Tutorial] Using only Realtime (no historical data) telemetry issue #44

AcidLeroy opened this issue Jan 18, 2021 · 2 comments

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@AcidLeroy
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I'm looking into using OpenMCT for a project of mine, however I do not need historical telemetry data. In order to see if OpenMCT was going to be the tool I could use, followed the getting started tutorial and slightly modified the index.html to only include the realtime plugin. My changes to the tutorial are below:

diff --git a/index.html b/index.html
index 8b9cdf3..7c772af 100644
--- a/index.html
+++ b/index.html
@@ -5,7 +5,7 @@
     <script src="node_modules/openmct/dist/openmct.js"></script>
     <script src="lib/http.js"></script>
     <script src="dictionary-plugin.js"></script>
-    <script src="historical-telemetry-plugin.js"></script>
+    <!-- script src="historical-telemetry-plugin.js"></script>-->
     <script src="realtime-telemetry-plugin.js"></script>
 </head>
 <body>
@@ -19,7 +19,7 @@
         openmct.install(openmct.plugins.Espresso());
 
         openmct.install(DictionaryPlugin());
-        openmct.install(HistoricalTelemetryPlugin());
+        // openmct.install(HistoricalTelemetryPlugin());
         openmct.install(RealtimeTelemetryPlugin());
 
         openmct.start();

After running this code, everything seems to work until I attempted to click something like the "Fuel" telemetry object (or any object within the spacecraft top level). When I did that, I get the following exception:
image

My question is this: Does OpenMCT support using only realtime data, and if it does, why does the tutorial barf when not including the historical data? What changes would I need to make to the tutorial code to prove that this feature is available?

Thanks for your time!
@evanfitzgerald
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evanfitzgerald commented Jul 26, 2021 •
edited
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@AcidLeroy Yes, openMCT supports only realtime data. The problem may be stemming from the example-server, where it is still attempting to use historical data (see server.js). If you comment that out, then the error should be resolved.

@jvigliotta
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Thanks @evanfitzgerald ! Another option would be to return false here:

openmct-tutorial/historical-telemetry-plugin.js

Line 9 in 123775a

return domainObject.type === 'example.telemetry';
some views will request both realtime and historical, but if you have a historical provider that returns false for "supportsRequest" then it shouldn't make those calls.

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3 participants
@AcidLeroy @jvigliotta @evanfitzgerald