Category : arduino-ide

I want to use the mac address of my system as a topic name. I want something like : project/00:1B:44:11:3A:B7/temperature/status I tried in this way: #define TEMP_STATUS_TOPIC "project/" + WiFi.macAddress() + "temperature/status" #define TEMP_CONTROL_TOPIC "project/temperature/control" But I get this error: no matching function for call to ‘MQTTClient::publish(StringSumHelper&, char [128], size_t&)’ Any tip will be greatly ..

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