I have this doubt. For example, I have a Smart Wrist Band (measures pulse, body temp), a Smart Gear/Watch (to display text alerts, control calls) and a Bluetooth headset. I need all the three to communicate with my mobile phone at the same given instant. 

Is it possible to achieve the same ?

What are the challenges involved if I need to develop an application on my own if I had to achieve the above possibilities ?

Your help is highly appreciated.

Note:
 - BLE has star-based network topology and maximum devices per Piconet is 8 including the Master
 - Please help me in understanding/visualizing the above theory that I learnt.

Thanks.