Bluetooth framework summary

1
Communication is bilateral , To create and maintain a BLE Communication connection , Quoted in Bluetooth “ role ” Concept . One BLE The device is either the master role or the slave role .
The definition of role is determined by who initiated the connection .
The initiator of the connection of the host company , And the slave is always connected .
The whole access and connection process is in the general access specification （Generic Access Profile,GAP） Implemented
2
By figure heel 1 guess
GAP It's before Bluetooth builds the chain Protocol used
L2CAP After Bluetooth builds the chain Protocol used