This issue is under investigation and appears to only affect Mac users. Current theory is that it is due to some problems during upgrade.
By saying below you mean end of June INTEL XDK IDE will stop to work COMPLETELLY? Or INTEL XDK IDE WILL continue to work but building using Adobe CORDOVA servers or equivalent?
Intel® IoT Gateways: Publishing Data to an MQTT Broker Using Python* de Intel® IoT Gateways: Publishing Data to an MQTT Broker Using Python*
These instructions guide you through the steps to publish data from an Intel® IoT Gateway to an MQTT broker (server) using a Python* Script.