Problems with USB GSM modem and devd

[ogogon]

Colleagues, could you please tell me what I'm doing wrong?
I have a Huawei E1550 USB GSM modem. When turned on, it creates three COM ports. I want the names of the special files to be unique and not change their order when connecting other USB-serial adapters.

Here it is:
ogogon@devel:/usr/local/etc/devd# lsusb
Bus /dev/usb Device /dev/ugen3.4: ID 12d1:1001 Huawei Technologies Co., Ltd. E161/E169/E620/E800 HSDPA Modem

I created a description for devd. Here it is:

#
# Example devd configuration file for USB printers.
# Uncomment the notify rule below to enable.
#
# Huawei Technologies Co., Ltd. E1550 HSDPA Modem

# Rules for modem Huawei E1550 (Interface 0)
attach 100 {
match "vendor" "0x12d1";
match "product" "0x1001";
match "interface" "0x00";
action "/bin/ln -sf /dev/$device-name /dev/modem_huawei_0";
};

detach 100 {
match "vendor" "0x12d1";
match "product" "0x1001";
match "interface" "0x00";
action "/bin/rm -f /dev/modem_huawei_0";
};

# Rules for modem Huawei E1550 (Interface 1)
attach 101 {
match "vendor" "0x12d1";
match "product" "0x1001";
match "interface" "0x01";
action "/bin/ln -sf /dev/$device-name /dev/modem_huawei_1";
};

detach 101 {
match "vendor" "0x12d1";
match "product" "0x1001";
match "interface" "0x01";
action "/bin/rm -f /dev/modem_huawei_1";
};

# Rules for modem Huawei E1550 (Interface 2)
attach 102 {
match "vendor" "0x12d1";
match "product" "0x1001";
match "interface" "0x02";
action "/bin/ln -sf /dev/$device-name /dev/modem_huawei_2";
};

detach 102 {
match "vendor" "0x12d1";
match "product" "0x1001";
match "interface" "0x02";
action "/bin/rm -f /dev/modem_huawei_2";
};

Unfortunately, the regular special files are created, but the links are not.
I ran devd -d. It outputs a lot of output, but I don't see any attempts to run ln.

What am I doing wrong? How can I solve my problem?

Thank you for your advice,
Ogogon.