callback was not declared in this scope

[itkindaworks]

callback was not declared in this scope

[Harvsch]

You need to add the "callback function header" before the line that first calls it. I copied the header along with surrounding code for you to see. This information is in the example code for the pubsubclient library.

char* lightTopic = "/test/light1";

// Callback function header
void callback(char* topic, byte* payload, unsigned int length);

WiFiClient wifiClient;
PubSubClient client(MQTT_SERVER, 1883, callback, wifiClient);

void setup() {

[malebuffy]

Thanks..
that worked

[brekl]

Estou com esse problema na ide callback not declaret script ,,
Oque devo fazer