Ssh command help please

[shoei600]

Dear forum, please help.

I am trying to send an ssh command from Home Assistant (terminal) to a Teltonika network switch to turn PoE on/off. I have everything working perfectly in two stages such that if I start an ssh session, a connection is made without delay, rsa keys are already shared on both devices, etc. I can then enter the command and everything works. If I send the command as one whole string, it does not. I either get syntax error, a "quote" prompt or > cursor only.

First part: ssh -i /config/.ssh root@192.168.1.2

Second part: ubus call poeman set '{“port”:“lan2”,“enable”:TRUE}’

One string: ssh -i /config/.ssh root@192.168.1.2 ‘ubus call poeman set '{“port”:“lan2”,“enable”:TRUE}’

I'm sure this is all about single and double quotes but I'm at a loss and desperate to solve this quickly.

Many thanks.

[ncompact]

Do you have the possibility to insert the commands on the device that must execute them in a script?

example on switch:
cat lan2_enable

#!/bin/sh
ubus call poeman set '{“port”:“lan2”,“enable”:TRUE}'

[greem]

Why is the username@address wrapped in square brackets?

Remove them and I suspect you'll be good to go.

EDIT no you won't; there's definitely some escaping needed here. Give me a minute or two!

[greem]

ssh -i /config/.ssh root@192.168.1.2 ‘ubus call poeman set \\'{“port”:“lan2”,“enable”:TRUE}\\'’

[NPeca75]

@shoei600

ssh -i /config/.ssh [root@192.168.1.2] ‘ubus call poeman set '{“port”:“lan2”,“enable”:TRUE}’

looks like missing ‘ char
it need to be ‘’ on the end

it is opened with " '{ " but on the end only " } "

[shoei600]

Thanks for responding so quickly. I'll try your commands. Square bracket was an error from copy/paste from notepad - removed.

Interesting idea about commands being local. I'm sure that's possible although I'm not certain how. Their RUT241 device has a package manger and I've added MQTT among other things but their network switch has OPKG but relies on a much deeper level of programming to do things, and doesnt support MQTT unless its specifically add and then scripted to interface, which is not something I would be able to do.

I'll try the suggestions shortly.

[shoei600]

The 'docker exec' command I believe puts the terminal into the home assistant shell. Both of the first commands (from green) reported 'ubus not found', the next was the quotes (NPeca75).

Thank you.

[iplaywithtoys]

Does the PoE control have to be SSH? Is SNMP an option for your scenario?

[shoei600]

This is an option and I did look at it but I found it got very confusing trying to find the relevant OIDs for the device. SNMP may be a better option so I can track the status of each PoE too.

The device is: https://teltonika-networks.com/products/ethernet-switches/tsw202

Home assistant SNMP here: https://www.home-assistant.io/integrations/snmp/

I think I had to use an OID explorer which had 1000s of parameters. Any idea how I should go about this please or am I on the wrong track?

Thanks.

[iplaywithtoys]

The "S" in "SNMP" is a bit of a misnomer, it's true. The protocol itself may be simple, but the data structures it supports are anything but simple.

You might find https://wiki.teltonika-networks.com/view/TSW202_SNMP and https://wiki.teltonika-networks.com/view/SNMP_configuration_example to be useful for narrowing down the specific OIDs you may need.

[shoei600]

Thought I was getting somewhere with the MIB explorer and IfaceStatus then came across this: Teltonika TSW202 PoE

I will lobby the manufacturer for my vote too. It's in the device GUI it really should be in the commands, we know it's in the ubus side of things.

[shoei600]

Just a thought, perhaps I can enable/disable the ports using snap and this too would kill poe. I don't need the port functional, it's to save power when I need to.

[iplaywithtoys]

Well, that's unfortunate. I'm at a loss to explain Teltonika's reasoning for that profoundly unhelpful response.

"[...] there are no plans for it [...] However, we [...] will consider it [...]"

Well, which is it? No plans, or up for consideration? Honestly, I despair sometimes.

So, looks like SNMP is a non-starter. Sorry for pointing you in a wrong direction.

[shoei600]

Ffs! SNMP can't set anything either.

[shoei600]

The device also has LLDP and OPC UA options if either of those could help me. The LLDP looks like it is designed to enable/disable ports but no idea if they are supported in Home Assistant.

[shoei600]

[shoei600]

Success.

Following the idea from ncompact, I have created a 'config' directory and added files for each on and off for each port I need, so it would be 16 for all 8 ports. I'm sure there will be a better way than this using IF statements but this will do for now.

After creating each sh file, I ran chmod 777 to enable it. I can now call a simple string from a terminal such as: "sh -i /config/.ssh root@192.168.1.2 ‘./config/lan1_off.sh"

My hope is that the config directory will remain beyond firmware updates which I'll confirm with Teltonika this week.

Thank you all for your help.

[spence]

@shoei600

My hope is that the config directory will remain beyond firmware updates

In addition to this it may be good to keep copies on your PC and on your file backup system.

[iplaywithtoys]

Now that is a neat approach. A shame you have to take that approach, thanks to the manufacturer's outright refusal to do the sensible thing and support SNMP, but it is a very neat approach. I like it.

And as @spence notes above, make sure you keep discrete backups.