Ubiquiti EdgeRouter X (erx) - Enable PoE pass through

Talk about Documentation
1

I enabled POE pass throught like explained in https://openwrt.org/toh/ubiquiti/ubiquiti_edgerouter_x_er-x_ka#poe_out_on_edgerouter_x

$echo 0 > /sys/class/gpio/export
$echo out > /sys/class/gpio/gpio0/direction
$echo 1 > /sys/class/gpio/gpio0/value

This works only when the device is powered by the included 12V adapter. When powered with 24V on eht0/PoE IN (or both) the device rejects the new value. From my understanding this is caused by an active driver in kernelspace, rejecting a tranfer to userspace.

$echo 1 > /sys/class/gpio/gpio0/value 
-ash: write error: Operation not permitted

The activation of eth4/PoE OUT is not permanent and reverted after a reboot.
Is it resonable to cusomize the solution from Edge Router X-SFP with i2c-gpio-custom to make this change permanent or am I missing something?

2

Did you try adding those commands to /etc/rc.local? That file is run at the very end of a Linux startup sequence.

3

Works with and without the 12V power adapter.
Thanks for the hint. I should add this to the Wiki. The different possibilities of powering the device should also be in there.

4

Maybe you can add, that that file can be edited via LUCI: System/Startup at the very bottom of the page.

5

Yea, that sounds foolproof. Just copy the lines into that page, save & reboot.

6

Hi, in the stock rom it's possible to the voltage and current of connected PoE devices, ideas how to get this working here?

7

The device only supports passive PoE (no 802.3af), Supported Voltage Range is 9 to 26VDC

8

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