CONFIG_BT_RX_BUF_LEN

Maximum data size for each HCI RX buffer. This size includes everything starting with the ACL or HCI event headers. Note that buffer sizes are always rounded up to the nearest multiple of 4, so if this Kconfig value is something else then there will be some wasted space. The minimum of 73 has been taken for LE SC which has an L2CAP MTU of 65 bytes. On top of this there’s the L2CAP header (4 bytes) and the ACL header (also 4 bytes) which yields 73 bytes.

Symbol:

BT_RX_BUF_LEN

Type:

int

Value:

“73”

User value:

(no user value)

Visibility:

“n”

Is choice item:

false

Is defined:

true

Is from env.:

false

Is special:

false

Ranges:

• [73, 2000]

Prompts:

• “Maximum supported HCI RX buffer length”

Default values:

• 76 (value: “n”)
• Condition: (none)
• 77 (value: “n”)
• Condition: BT_MESH_PROXY (value: “n”)
• 264 (value: “n”)
• Condition: BT_BREDR (value: “n”)

Selects:

(no selects)

Reverse (select-related) dependencies:  

(no reverse dependencies)

Additional dependencies from enclosing menus and ifs:  

BT_HCI && BT (value: “n”)

Locations:

• ../subsys/bluetooth/host/Kconfig:35