How to disgard NaN messages

A readout of my energy Smart meter gives me different values. Sometimes it gives a NaN value and sometimes the real value of the Gas-meter. How do I change my fow to disguard the NaN values and only let the real values pass.

flows.json (2.2 KB)

Thanks for a reply.

A quick easy solution is to use isNaN in a function node...

if(isNaN(msg.payload)) {
  return null; //halt flow
}
return msg;

Note, isNaN expects a number.

Thank you Steve, it works just fine.:+1:

Does using a Switch node to test for is of type Number reject NaN? I can't test it at the moment. If so then that could be used to pass only good numbers.
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That does not work because NaN is also of type number. The sollution Steve gave does work.

I did wonder whether that would be the case. So NaN is a Number and is Not a Number at the same time!

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