How to reset USB port or USB modem?

[Pila]

As my router (56) gets confused after external WAN IP address change and shuts down outbound communication, I need a way to:

a) make my USB modem hung up and/or redial

b) shut down my USB port and restart it (modem will redial automatically)

from a script. Can someone help me as I am unable to do so?

 

[L&LD]

What router do you have? What firmware version? What USB modem? What ISP?

I hope others can help answer your question(s), but the missing information makes me think they won't be able to.

 

[Pila]

What router do you have? What firmware version? What USB modem? What ISP?

I did not put that info here originaly as it is irellevant. This is a pure Linux script question dependant on Linux implementation at Asus routers. Same as a reboot of my router whcih I want to avoid: type reboot in any case.

For modem hang and dial: ath and atd are the same as they were 50+ years ago, but I see / know of no way to issue them directly. Killing and restarting an USB port must be the same procedure regardles of what is connected to it - i was just not able to do it properly for Asus router.

But: Asuswrt-Merlin RT-AC56U_380.59_0
Modems: 3g Huawei E3131 (currently used, single NAT) and 4g Huawei K5150 Vodafone (double NAT). ISP VIPnet Croatia.

 

[Nerre]

No it is not a pure Linux script question, it is a matter of controlling hardware from a script and that is very far from just being a script matter. There is AFAIK no generic Linux command to turn on or off an USB port. I looked around a lot for this before because an USB cell modem I used for sending SMS needed to be reconnected once or twice a week.

 

[Pila]

OK, true. I can kill my active USB modem link link several wways: unbind / bind, echo 0 > authorized or usb_modeswitch -v 12d1 -p 1506 -R

But: I do not know how to make it dial as after reset it does auttomatically. Where is the dialer?

 

[Pila]

What I meant, I do not need someone to walk me throught every step. I just need to know which command I need to dial the USB modem from a script.

But, judging from many replies, I can only use Raspberry to kill the power in the modem USB cable

 

[Nerre]

OK, true. I can kill my active USB modem link link several wways: unbind / bind, echo 0 > authorized or usb_modeswitch -v 12d1 -p 1506 -R

For me, those tricks didn't work. I still had to remove the modem from the port.

I think the dialing is performed by pppd (if it uses regular dialup). If the modem emulates a network interface the dialup should be performed by the modem itself.

 

[Pila]

For me, those tricks didn't work. I still had to remove the modem from the port.

Me to. Or reboot entire router which is not exactly alegant solution.

I think the dialing is performed by pppd (if it uses regular dialup). If the modem emulates a network interface the dialup should be performed by the modem itself.

My modem does not dial after any of the commands I mentioned before. Only after it gets disconected from power. Or maybe Router dials, I do not know. I will try looking for this pppd.

 

[Pila]

Why the commands:

> sh -c 'echo 2-2 > /sys/bus/usb/drivers/usb/unbind'

> sh -c 'echo 2-2 > /sys/bus/usb/drivers/usb/bind'

do not turn USB modem off and back on?

 

[john9527]

Not sure if it will work, but you might try

/sbin/hotplug2