The IBM Watson IoT Platform is a fully managed, cloud-hosted service that makes it simple to derive value from Internet of Things (IoT) devices.
The following link is the first step to walk you through the aformentioned service:
https://cloud.ibm.com/catalog/services/internet-of-things-platform
Then it is needed to add the device, write down the auth-method and auth-token for later connection to messaging.internetofthings.ibmcloud.com