---
name: "hcid"
section: "8"
platform: "linux"
package: "bluez-utils"
version: "3.36-3"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/hcid"
---

# hcid(8)

Bluetooth Host Controller Interface Daemon

## NAME

hcid - Bluetooth Host Controller Interface Daemon

## SYNOPSIS

**hcid** \[ **-n** \] \[ **-f** *config-file* \]

## DESCRIPTION

This manual page documents briefly the **hcid** daemon, which manages all the Bluetooth devices.  **hcid** itself does not accept many command-line options, as most of its configuration is done in the  **hcid.conf** file, which has its own man page. **hcid** can also provide a number of services via the D-BUS message bus system.

## OPTIONS

- **-n**

  Don't fork to run daemon in background.

- **-d**

  Enable debug information output.

- **-s**

  Enable internal SDP server.

- **-m mtu-size**

  Use specific MTU size for SDP server.

- **-f config-file**

  Use alternate configuration file instead of /etc/bluetooth/hcid.conf

## FILES

- */etc/bluetooth/hcid.conf*

  Default location of the global configuration file.

- */var/lib/bluetooth/nn:nn:nn:nn:nn:nn/linkkeys*

  Default location for link keys of paired devices. The directory *nn***:***nn***:***nn***:***nn***:***nn***:***nn* is the address of the local device. The file is line separated, with the following columns separated by whitespace:

  *nn***:***nn***:***nn***:***nn***:***nn***:***nn* Remote device address.

  *nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn* Link key.

  *n* Link type integer.

- */var/lib/bluetooth/nn:nn:nn:nn:nn:nn/names*

  Default location for the device name cache. The directory *nn***:***nn***:***nn***:***nn***:***nn***:***nn* is the address of the local device. The file is line separated, with the following columns separated by whitespace:

  *nn***:***nn***:***nn***:***nn***:***nn***:***nn* Remote device address.

  *name* Remote device name, terminated with newline.

- */var/lib/bluetooth/nn:nn:nn:nn:nn:nn/features*

  Default location for the features cache. The directory *nn***:***nn***:***nn***:***nn***:***nn***:***nn* is the address of the local device. The file is line separated, with the following columns separated by whitespace:

  *nn***:***nn***:***nn***:***nn***:***nn***:***nn* Remote device address.

  *nnnnnnnnnnnnnnnn* Remote device LMP features coded as an 8 byte bitfield.

- */var/lib/bluetooth/nn:nn:nn:nn:nn:nn/manufacturers*

  Default location for the manufacturers cache. The directory *nn***:***nn***:***nn***:***nn***:***nn***:***nn* is the address of the local device. The file is line separated, with the following columns separated by whitespace:

  *nn***:***nn***:***nn***:***nn***:***nn***:***nn* Remote device address.

  *n* Remote device manufacturer integer.

  *n* Remote device LMP version integer.

  *n* Remote device LMP sub-version integer.

## SEE ALSO

[**hcid.conf**(5)](/hcid.conf/5.md)

## AUTHOR

This manual page was written by Philipp Matthias Hahn and Fredrik Noring.