Create your second flow

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1. Validate and scale

   Convert the numeric input, reject blank or non-finite values, then set temperature to raw / 10 and unit to °C.

2. Choose the branch

   Configure Switch to test msg.payload.temperature: greater than or equal to the number 30, then otherwise.

3. Observe both outcomes

   Connect the outputs to named High and Normal Debug nodes. Deploy and test 255, then 305.

4. Test invalid input

   Try the string invalid. Expect the Function node to report an error to Catch and emit no normal or high result.

const raw = Number(msg.payload);
if (String(msg.payload).trim() === "" || !Number.isFinite(raw)) {
  node.error("Invalid raw value", msg);
  return null;
}
msg.payload = { temperature: raw / 10, unit: "°C" };
return msg;