use hci_can_send_acl_packet_now instead of hci_can_send_packet_now_using_packet_buffer, hci_can_send_prepared_acl_packet_now instead of hci_can_send_packet_now - providing handle if available

use hci_can_send_command_packet_now instead of hci_can_send_packet_now_using_packet_buffer(HCI_COMMAND_DATA_PACKET)

prevent use after free when daemon client connection is closed, fixes issue #402

emit L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST and L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE

replace all manual list iteration with linked_list_iterator functions in l2cap

stop l2cap_rx_timer before free'ing l2cap_channel_t, fixes issue #404

replace hci_send_acl_packet(data,size) with hci_send_acl_packet_buffer(size) to document that ACL packet have to be prepared in the hci packet buffer

use non-flushable packet boundary flag if supported - fixed unspecified behavior sending LE ACL packets

forward HCI Events to att and sm packet handlers, too

track Bluetooth Device Address Type in hci_connection_t struct

added hci_release_packet_buffer() and l2cap_release_packet_buffer()

rename hci_get_outgoing_acl_packet_buffer into hci_get_outgoing_packet_buffer

add asserts to check if buffer was reserved before calling send prepared

add l2cap_can_send_connectionless_packet_now

rename l2cap_can_send_packet_now_using_buffer to l2cap_can_send_packet_now

reserve l2cap packet buffer before using it

reserve hci packet buffer before using it

add flag to track if hci packet buffer is reserved

reject any LE Signaling commands

prepare for sending command_reject on le signaling channel

execute l2cap_run() also for incoming events

don't reject incoming SDP connection, see #378

added l2cap_require_security_level_2_for_outgoing_sdp

update state before calling function that might read it

init l2cap->required_security_level to LEVEL_0 for outgoing connections