Question 190898 in Javascript Question posted in
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Javascript – – Error -Function tried to send a message of type String

I am publishing a random temperature with topic:Test/Temperature.

I want a chart that displays this temperature using the topic.

I am getting this error: Function tried to send a message of type string

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I tried to remove the function or change the code inside the function, but it wouldn’t work.

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Answers


  1. Chosen as BEST ANSWER
    0

    @hardillb Very Helpful! I want the publisher and the subscriber to see the following values "temp" , "id" , "status"

    But could the chart show only the temperature value? python code , publish , chart


  2. 0

    Function nodes must ALWAYS return and object.

    By returning just the msg.topic you have returned a string, which the error is correctly pointing out.

    The correct version of the function would be:

    msg.topic = 'Test/Temperature'
return msg

    (But you can remove the whole function node and just set the topic and the payload in the inject node)

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