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CONFIG_BT_RX_BUF_LEN
¶
Maximum supported HCI RX buffer length
Type: int
Help¶
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.
Defaults¶
264 if
BT_BREDR
258 if
BT_EXT_ADV
77 if
BT_MESH_PROXY
76
Kconfig definition¶
At <Zephyr>/subsys/bluetooth/host/Kconfig:34
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:34
→ <Zephyr>/subsys/Kconfig:8
→ <Zephyr>/subsys/bluetooth/Kconfig:239
Menu path: (Top) → Sub Systems and OS Services → Bluetooth
config BT_RX_BUF_LEN int "Maximum supported HCI RX buffer length" range 73 2000 default 264 ifBT_BREDR
default 258 ifBT_EXT_ADV
default 77 ifBT_MESH_PROXY
default 76 depends onBT_HCI
&&BT
help 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.
(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)