DISCONNECTION
To close a channel, one L2CAP entity must send a disconnection request to the other. If an entity receives a disconnect request from the upper-level protocol, it passes the request onto the remote device, and the local entity enters the W4_L2CAP_ DISCONNECT_RSP state to await a response. If the local entity receives an indication that the remote device is requesting disconnection, it sends a disconnection request to the upper layer and then enters the W4_L2CA_DISCONNECT_RSP state to await a response. In either case, when the
expected response is received, the local device enters the CLOSED state.