Thank you for contacting us.
First, we want to apologize for the late reply.
About your issue, well we are not experienced with this sensor and cloud, but I found a lot of information that can be helpful for you, if you need more help about the SensorTag CC2650, you can check the user guide: http://processors.wiki.ti.com/index.php/CC2650_SensorTag_User's_Guide
Now, about using the SensorTag with the Intel Edison, there are some examples in this repository: https://github.com/burrsutter/ti_sensortag_node, so you can use them as reference.
(Check these links too: https://www.youtube.com/watch?v=NrFXfcFn5TQ , https://software.intel.com/en-us/java-for-bluetooth-le-apps)
Regarding the cloud HiveMQ, I think you need to use the library MQTT.js, I recommend you to visit this site: http://www.hivemq.com/blog/mqtt-client-library-mqtt-js
I hope you find this information useful.
Have a nice day.