Can I set this sensor parameters via MQTT callback?

Projects Programming
1

Hi,

The sensor in question is the Sensiron SCD30 CO2 sensor, I am using the Adafruit library. Here is a link to the sketch to avoid an overly long post:

My question is, should it be fine to set a sensor parameter via a MQTT callback function, or any function in fact, that is normally set in setup?

e.g.

void MQTTcallback()
{
Some topic filtering code here....
Save incoming to variable `value`

   if (!scd30.forceRecalibrationWithReference(value)){
     Serial.println("Failed to force recalibration with reference");
     while(1) { delay(10); }
   }
  Serial.print("Forced Recalibration reference: ");
  Serial.print(scd30.getForcedCalibrationReference());
  Serial.println(" ppm");
}

Thanks for any advice!

2

I would not have other operations in the MQTT callback run. The only code processing to be done in the callback is receive payload, receive topic, signal main that a message has arrived for parsing.

Serial.prints in the callback mess with interrupts. Delay in an interrupt is all kinds of whacked out.

But, yes I can pass sensor setting s in the MQTT payload and send those parameters to a sensor.

1 Like
3

Ah thanks, I do normally pass to a function but for simplicity did show it this way, did not know it was an issue though.

So in principle it should be fine, good news.
Thanks!

4

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