best directory to lte ndis startup script?

[eMdzeJ]

I recently migrated from pfsense. My WAN connection is LTE Huawei E3372 in stick mode with disabled CD-ROM and SD card modes.

In pfsense I have startup script to set APN in NDIS mode - You can't do that from GUI. It's very simple script, just 2 lines (set APN)

#/bin/sh
echo 'AT^NDISDUP=1,1,"internet"' > /dev/cuaU0.1

of course I set +x on it and assigned ue0 as WAN interface.

In pfense i used shellcmd pkg as earlyshell.

In opnsense I made script in os level in /usr/local/etc/rc.syshook.d/early

When opnsense boots up I see that stick is connected (led is solid green) for about 5 seconds and goes to blink. After about 2 minutes everything is again connected and after that works ok. I tried another priority (file name starting with 01,20,50 and 99), also I moved script to "start" folder. Nothing changed except it blinks all the time for almost 2 minutes and after that works ok.

Also my test pc don't get dhcp address until lte stick is full connected.

So, in pfsense my firewall boots up in 10-15 seconds. In opnsense almost 3 minutes :/

Maybe I did something wrong? But it is very simple config. Should I place my script somewhere else?