mqtt/Mqtt/MQTT.Broker/release/appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "localhost",
  "MqttOption": {
    "UserName": "admin",
    "Password": "admin123456"
  }
  
}