While adding a device, you need to provide following parameters:
Password for Your Device
Name of Your Device
Category for Your Device
Access control topic with pub, sub or pubsub options
Entered Device Key will be the Username for MQTT Connection. It always starts with the User's Account ID.
Entered password will be considered as password for MQTT Connection.
User can give a name for a device. Later user can search device by its name.
User can assign a Category for device. It will be helpful for sorting devices by their category.
Entered client ID will get used for MQTT Connection.
Case 1: User can provide fixed client ID.
Case 2: If user is dynamically generating client Id in his code, then he can provide client ID as *.
Case 3: If single MQTT client is used by many devices then user has to keep it as "*".