nodMCU how to alternate between 2 topic

[PC]

Hello,
I have a nodeMCU (with an LCD display) which I would like to alternate the reading of 2 MQTT topic.
I have a flag (dependent on the state of a digital entry) which works, but I do not see the change of topic on reading.

Thank you for your help

code :

void reconnect() {
  while (!client.connected()) {
    Serial.println("Connection au serveur MQTT ...");
    if (client.connect("LectureXYZ_1")) {
      Serial.println("MQTT connecté");
    }
    else {
      Serial.print("echec, code erreur= ");
      Serial.println(client.state());
      Serial.println("nouvel essai dans 1.5 s");
      delay(1500);
    }
  }
   if (flagTfa) {
    client.subscribe("TFA");
  } else {
    client.subscribe("CPT");
  }
}

[PC]

me again,
I have an idea to me: should I disconnect to the change of flag?
And in this case, how to do it?
thanks again

[Greg Troxel]

As I understand it, this list is more or less a protocol working group:

This group brings together discussions of the protocol and different
implementations. Other discussion media exist (for example, individual
software implementations may have their own project resources) but this
group is for discussion of the protocol and MQTT ecosystem as a
whole. Off-topic debates, discussion around alternative protocols,
etc. do not belong in this group.

rather than a help forum for programming.

[Blaise Cacramp]

Merci pour votre aide, comment dire ... constructive !

Le 26-08-22 à 18:34, Greg Troxel a écrit :