>> How can my bluetooth iphone "talk" to my car and my bluetooth fitbit watch at the same time??
Because Bluetooth uses profiles to control and setup connections. Connection to your car is probably using something like Handsfree Profile and for audio streaming A2DP. Could even be using rSAP (SIM Access Profile) to use the phone SIM in the car. But probably one or two BT profiles in use for the car connection.
The Fitbit will use something else. Maybe Generic Attribute Profile (GATT)?
So yes BT supports multiple connections but one profile can connect to one device at a time (in general).
Think of AD2P as being a replacement to headphone socket for example. It connects point to point. And plug in real headphones and it probably overrides the BT connection.
Last edited by: rtj70 on Sun 25 Jun 17 at 22:54
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