Central

The role of Central can be understood as a role of master in a master-slave architecture. It is capable of making a connection to the peer. A central can connect to multiple peers at the same time. A central can be a smartphone/tablet which can initiate a session by connecting to various BLE peer. A smartphone has the capability to connect to the Bluetooth headphones and Bluetooth smartwatch both at the same time. Central is also the originator of the connection request which means that no other role can start the connection request.