[Bluez-devel] First HCI command sent to a device

[Marcel Holtmann <marcel@holtmann.org>]

Hi Folks,

while debugging the i-Tec dongle with Broadcom HID proxy support I saw
that this dongle expects that the first command is a HCI_Reset. I can't
remember any time where BlueZ has used this command. Our command
sequence on initialization can be found in hci_core.c:hci_init_req() and
it looks like this:

/* Mandatory initialization */

        /* Read Local Supported Features */
        hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_LOCAL_FEATURES, 0, NULL);

        /* Read Buffer Size (ACL mtu, max pkt, etc.) */
        hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BUFFER_SIZE, 0, NULL);

        /* Read BD Address */
        hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BD_ADDR, 0, NULL);

        /* Read Voice Setting */
        hci_send_cmd(hdev, OGF_HOST_CTL, OCF_READ_VOICE_SETTING, 0, NULL);

/* Optional initialization */

        /* Clear Event Filters */
        cp.flt_type  = HCI_FLT_CLEAR_ALL;
        hci_send_cmd(hdev, OGF_HOST_CTL, OCF_SET_EVENT_FLT, sizeof(cp), &cp);

        /* Page timeout ~20 secs */
        param = __cpu_to_le16(0x8000);
        hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_PG_TIMEOUT, 2, &param);

        /* Connection accept timeout ~20 secs */
        param = __cpu_to_le16(0x7d00);
        hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_CA_TIMEOUT, 2, &param);

Until the i-Tec dongle this worked perfect, but now my question is what
is the prefered init sequence? How do other stacks do it? Acutally how
do Microsoft or Widcomm init a device? Will adding a HCI_Reset break any
other Bluetooth adapter? Feedback from everyone is welcome before I am
going to make a decission on adding HCI_Reset or not.

Regards

Marcel




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