[Commotion-dev] ubiquiti auto-reset

[Josh King]

Thanks Danny! I noticed at the end of the thread that someone made their
own custom inline reset switch using Flemming's schematics:

http://community.ubnt.com/t5/airMax-General-Discussion/Remote-hardware-reset-circuitry-of-NanoStation-M/td-p/58320/page/3

Also Flemming's response to the Ubiquiti engineer about the lack of
specs is pretty hilarious. :-)

Let me know if you give it a try. We intend to try it out here as soon
as we get a spare moment. Seems like it should be pretty easy.

On 01/30/2014 04:42 PM, Danny Iland wrote:
> A guy named Flemming Frandsen posted some information about simulating
> the PoE injector's reset button on the Ubiquiti forums, and his own site.
> 
> Here's the discussion
> <http://community.ubnt.com/t5/airMax-General-Discussion/Remote-hardware-reset-circuitry-of-NanoStation-M/td-p/58320> and circuit
> diagram <http://dren.dk/mreset.html> with more detail.
> 
> "Bottom line is that to press the reset button on the M-series hardware
> remotely all you need to do is to put +15 to +24V on the center tap of
> the ethernet transformer at the remote end, with respect to the power
> supply ground. I haven't tried it but it ought to be possible to simply
> put + on any one of the 4 wires."
> 
> If you want to use an Arduino connected directly to the radio instead of
> the ethernet cable, there's a COLD_RST pin on the JTAG header, or you
> could connect to the TTY serial port and perform a software restart.
> See the openwrt wiki
> <http://wiki.openwrt.org/toh/ubiquiti/nanostation> or Ubiquiti's page
> <http://wiki.ubnt.com/index.php/NanoStation2_RS232_Connection> for
> details. Any 3.3V arduino would work for this, or any arduino with a
> level converter. 
> 
> Anyone have experience with this? If not, I might give it try pretty soon.
> 
> Danny Iland
> 
> 
> 
> On Thu, Jan 30, 2014 at 1:25 PM, Josh King <jking at opentechinstitute.org
> <mailto:jking at opentechinstitute.org>> wrote:
> 
>     Hi all,
> 
>     I was speculating today about how we might be able to more smoothly
>     automate testing on our various testbed networks. Particularly, I was
>     thinking about how CONFINE uses a recovery device as a "parent" to power
>     cycle a stuck node (http://wiki.confine-project.eu/hw:recovery-device).
>     This made me think about how some Ubiquiti POEs have a reset button that
>     is able to send a signal over the wire to flip a node into TFTP mode in
>     the same way as the reset button on the node itself. I was wondering if
>     anyone was familiar with how that process actually worked (I assume
>     through sending some hi/low signal on one of the ethernet pins that the
>     chipset in the node recognizes), and if it was possible to simulate it
>     using an Arduino or similar. It would be great to be able to pair
>     testbed nodes with something like a raspberry pi that could remotely
>     reset and TFTP nodes with new firmware and run network tests independent
>     of the nodes themselves.
>     --
>     Josh King
>     Lead Technologist
>     The Open Technology Institute
> 
> 
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> 
> 

-- 
Josh King
Lead Technologist
The Open Technology Institute

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