NG_UBT(4)

✨ NG_UBT ✨

okay bestie, welcome to ng_ubt — it's the ng_ubt Netgraph node type that is also a driver for Bluetooth USB devices 💖 yes it's doing two jobs, main character energy fr.

this page lives in the Kernel Interfaces Manual, section 4. iykyk 🎀

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🌸 NAME 🌸

ng_ubt — Netgraph node type that is also a driver for Bluetooth USB devices

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🦋 SYNOPSIS 🦋

#include <sys/types.h>
#include <netgraph/bluetooth/include/ng_ubt.h>

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💅 DESCRIPTION 💅

so the ubt node type is both a persistent Netgraph node type and a driver for Bluetooth USB devices. no cap. it implements a Bluetooth USB transport layer as per chapter H2 of the Bluetooth Specification Book v1.1. and the way it just ✨appears✨ — a new node is created when a supported USB device is plugged in. plug and play but make it netgraph 🫶

the node has a single hook called hook. incoming bytes received on the device are re-assembled into HCI frames (according to the length). full HCI frames are sent out on the hook. the node will add a HCI frame indicator if the device did not send it. HCI frames received on hook are transmitted out. and the node will drop the HCI frame indicator unless the device requires it to be present. literally handling the vibes of both directions 😌

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🎀 HARDWARE 🎀

the ng_ubt driver supports all Bluetooth USB devices that conform with the Bluetooth specification v1.1, including:

• 3Com 3CREB96
• AIPTEK BR0R02
• EPoX BT-DG02
• Mitsumi Bluetooth USB adapter
• MSI MS-6967
• TDK Bluetooth USB adapter
• Broadcom Bluetooth USB adapter

look at that roster 🔥 iconic lineup honestly.

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🧚 HOOKS 🧚

this node type supports the following hooks:

• hook — single HCI frame contained in a single mbuf structure.

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👑 CONTROL MESSAGES 👑

this node type supports the generic control messages, plus the following:

• NGM_UBT_NODE_GET_DEBUG (get_debug) — returns an integer containing the current debug level for the node. nosy but make it useful 💜
• NGM_UBT_NODE_SET_DEBUG (set_debug) — this command takes an integer argument and sets the current debug level for the node.
• NGM_UBT_NODE_GET_QLEN (get_qlen) — this command takes a parameter that specifies the queue number and returns the current maximal length of the queue for the node.
• NGM_UBT_NODE_SET_QLEN (set_qlen) — this command takes two parameters that specify the queue number and the maximum length of the queue and sets the maximal length of the queue for the node.
• NGM_UBT_NODE_GET_STAT (get_stat) — returns various statistic information for the node, such as: number of bytes (frames) sent, number of bytes (frames) received and number of input (output) errors. the receipts, literally 📊
• NGM_UBT_NODE_RESET_STAT (reset_stat) — reset all statistic counters to zero. fresh start, clean slate, slay 💅

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💀 SHUTDOWN 💀

this node shuts down when the corresponding USB device is un-plugged. it's giving "you left, so i left" 😭

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🌈 SEE ALSO 🌈

netgraph(4), ugen(4), usb(4), ngctl(8)

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⭐ HISTORY ⭐

the ubt node type was implemented in FreeBSD 5.0. throwback fr fr 🕰️

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🫶 AUTHORS 🫶

Maksim Yevmenkin <m_evmenkin@yahoo.com>

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🙈 BUGS 🙈

Isochronous USB transfers are broken. This means that the USB device will not be able to transfer SCO data (voice). USB interrupt transfers are implemented as bulk-in transfers (not really a bug).

so yeah — the SCO/voice thing is genuinely broken, not a vibe issue, it's just broken 💀 the bulk-in thing though? not really a bug, we're chill about it.

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and that's the whole page, bestie!! this came from the Debian manual, dated December 26, 2012 — yes it's a vintage drop, we love her anyway 🎀✨ bye mwah 💖