How to Plot line chart of real time data

General
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Here is another thread where you can find how to use highcharts library and present it inside ui_template node. Plot a time series using highcharts

Examine the code inside the ui_template node first and see the difference with your code. Adjust your code to get the library correctly working and if there will be no errors in browser console, you are ready to go to adjust the incoming messages to match the needs for the chart library to be able to show what you are trying to plot.