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if (topic == "TEST") [message #1848524]

Tue, 07 December 2021 01:41

Erik doedel

Messages: 1
Registered: December 2021

Junior Member

Hello all,

I have a sensor that posts it value to a MQTT topic with a sub topic.
Mean topic is SCD
sub topic is temperature

Now how do i wright dis down in the following part."

 if (topic == "TEST")

Wen i have

void callback(char* topic, byte* payload, unsigned int length) {

  Serial.print("Message arrived in topic: ");
  Serial.println(topic);
  Serial.print("Message:");

  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }

  if (topic == "SCD/temperature") {
    Serial.println("Received"));
  }

}

I do receive this in the monitor:
23:27:31.092 -> Ambient = 20.47C Object = 20.05C

But its not posting "Received"

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