Collectd-mod-exec script to retrieve DSL values from ZyXEL VMG1312 modem

[takimata]

@mes

any thoughts on making a repo for this?

No. That would involve creating a dedicated collecd plugin and upstreaming it, which is entirely out of the scope of this exercise, at least for me.

maybe figure out a way to avoid having credentials in plain text

That is not possible, the credentials are needed in plain text to authenticate the telnet connection.

[mes]

gotcha. no worries.

[takimata]

@takimata

xdslctl stats --show still gives a sensible "available seconds" (AS) value, but I'm not sure how closely it relates to the actual line uptime

After some time (after all it took another 50+ days to get to the point where I would care to look into it again) and observation, the "AS" value is indeed correctly reporting the line uptime. I switched the script to directly using that value now, without any workarounds and re-parsing. The Gist is updated.

Update: I sacrificed my 55+ day line uptime and confirmed that the "AS" value is properly reset when the line resyncs. I'm happy with this update.

[moeller0]

@takimata

a) the ZyXEL appears not to speak any of the ciphers OpenWrt's own dropbear-ssh client comes with (it bombs out with No matching algo enc c->s)
b) the shell opened by ssh is actually more restricted than the shell opened by telnet, and some weird rights issue prevents the execution of xdslctl

So

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 -c 3des-cbc admin@192.168.10.1

works with open-ssh, and running sh first to start busybox gives a shell that seems to execute xdslctl.
I would not be amazed if the Zyxel actually would be overtaxed with doing ssh, and I do not want to imply ssh should be used instead of netcat; but it might be relevant information for readers of this topic.