ESP8266; MQTT; DNS Not Working?

[blastoff]

I'm using the GatewayESP8266MQTTClient sketch and trying to use the #define MY_CONTROLLER_URL_ADDRESS macro that was committed a few months ago.

If I type in an IP address in quotes it works as expected, however, if I type in a DNS name it does not. Am I doing something wrong?

I'm using the latest commit from the development branch.

// Works
#define MY_CONTROLLER_URL_ADDRESS "192.168.1.52"

// Does not work
#define MY_CONTROLLER_URL_ADDRESS "mosquitto.home"

// Also does not work
#define MY_CONTROLLER_URL_ADDRESS "test.mosquitto.org"