Identify the device
Physical Devices
In general, the West Connectivity supports any kind of devices which can be a client of building a secure Http/Mqtt connection to platform, refer TLS reference for more detailed.
You should make sure the devices has been installed the proper firmware/application and they are able to run as Http/Mqtt client.
Simulator
If you don't have a physical device, we suggest you use the Postman as the Http client, for Mqtt, the Mqtt explorer is recommended
Next: You can provision your device