Make the AWS_MQTT_PORT configurable for CI.
* @note Port 443 requires use of the ALPN TLS extension with the ALPN protocol
* name. When using port 8883, ALPN is not required.
*/
+#ifndef AWS_MQTT_PORT
#define AWS_MQTT_PORT ( 8883 )
+#endif
/**
* @brief Path of the file containing the server's root CA certificate.
