RE: hcitool commands on firmware level

Susheel Nuguru — Tue, 27 Jan 2026 09:01:07 GMT

[quote user=""]I want to mimic the behaviour of hcitool command right on the firmware level of Zephyr and activate,what hcitool activates,directly in firmware, not on OS Linux level.[/quote]

Not in a compliant HCI‑controller design. The HCI USB sample exposes raw HCI (CONFIG_BT_HCI_RAW=y), and by definition it waits for the host to send commands. There is no host stack in the firmware to issue HCI commands on its own.

If I am not mistaken hcitool cmd 0x08 31 00 04 04 is LE Set Default PHY . That command only sets the default connection PHY preference. It does not enable coded scanning. Coded advertising discovery is controlled by LE Set Extended Scan Parameters followed by LE Set Extended Scan Enable , and those commands must come from the BlueZ host in your case.

The hci_usb sample is a controller‑only build. By design it does not issue HCI commands to itself; it waits for the host to send them. So there isn’t a supported way to force coded scanning purely in the controller firmware without breaking HCI behavior.

I think you can try to keep HCI USB, but make the host send the proper extended scan commands (0x2041/0x2042) with Coded PHY enabled. I do not have a Linux machine but I read somewhere that on standard Linux you can do this via btmgmt/btmon or a custom script. On Home Assistant OS, you might need an add‑on or integration that can send those HCI commands. I am also no expert in that area.