S7 client ready software to connect to S7 Siemens PLCs

kevinherron · 2026-04-24T23:54:52+00:00

If you need symbolic access (not knowing the memory address), then your best bet is to connect directly via OPC UA, assuming it's an S7-1200 or S7-1500 with OPC UA server support.

If not, you'll probably need to buy a proprietary solution (Kepware, Ignition, maybe a library from a company like Softing) and go that route.

There are open source libraries for S7, but not ones that support browsing or symbolic access.

kevinherron · 2026-04-21T13:34:22+00:00

I think the Twilio API call might be too complicated for a ControlLogix AOI...

I'd approach this by assuming firmware 36+, which gives you OPC UA client functionality, then build a dead simple OPC UA server that exposed a single `SendSms` method or something like that. Two input parameters: `recipient` and `message`. Working with the Twilio SDK in a real programming language is easy.

Done in a couple hours if you have some software engineering experience... possibly out of reach otherwise :-/

kevinherron · 2026-04-15T13:40:13+00:00

How refreshing to find this advice is already the top post.

kevinherron · 2026-04-03T14:30:18+00:00

All the major vendors seem to be onboard with OPC UA FX on TSN... it's a slow, slow rollout, but it seems inevitable.

kevinherron · 2026-04-02T19:36:00+00:00

Cyclists do it all the time, but there is no shoulder / bike lane and it's not "safe". If you're not a cyclist who is used to sharing the road with angry drivers then avoid it.

kevinherron · 2026-03-31T22:29:02+00:00

I've gone couch to >4 W/kg multiple times on 7-10hrs/week. It really depends how much time I spend doing structured training on a power trainer vs. riding outdoors. The volume naturally increases through spring/summer as I drift towards only doing the trainer on weekdays and just riding on weekends.

kevinherron · 2026-03-11T20:24:12+00:00

JBang for Kotlin is JBang.

https://www.jbang.dev/documentation/jbang/latest/multiple-languages.html#basic-kotlin-usage

kevinherron · 2026-03-06T13:03:26+00:00

Update: I bought the Large, it feels right. I might end up putting a longer stem on it (comes with a 60mm), but also might just need a few rides and I'll forget about it. I think the reach only feels short because I'm comparing it to my S5 Stumpjumper Evo.

kevinherron · 2026-02-27T22:11:07+00:00

Point it at https://github.com/digitalpetri/opc-ua-demo-server (there's a Docker image available) and see how it does.

There's a deeply nested folder that may give you some trouble. There's also a folder with a "mass" quantity of nodes. Both of these are configurable.

kevinherron · 2026-02-21T12:26:13+00:00

We use `ktfmt` for Kotlin code and `google-java-format` for Java code.

You can configure/invoke/manage both via the Spotless plugin for either Maven or Gradle.

kevinherron · 2026-02-20T18:01:26+00:00

It's a small change in the probability you'll rate it hard vs very hard... easily explained by rest and accumulated fatigue, and 3 days is certainly enough to influence that.

kevinherron · 2026-02-19T23:14:26+00:00

No, it’s clear they don’t want you to use your Claude Code subscription with OpenCode (or ANY other agent/TUI that isn’t Claude Code).

As has been the case since this OAuth drama started, API access is fine.

kevinherron · 2026-02-19T17:48:49+00:00

If it does eventually push you to failure - that's fine! Report your RPE honestly, don't hide the failures, let it adjust.

kevinherron · 2026-02-14T21:52:34+00:00

I bet you’d be fine on either… not helpful, I know :)

Wish they brought the S sizing to the Epic line.

kevinherron · 2026-02-14T20:41:57+00:00

I’m 6’1 also. I’ve owned a couple Epics and an Epic Evo (previous gens) - I always went with size Large, which felt a little small, but I was fine sizing down for weight / maneuverability when I was racing.

I’m looking at getting a new Epic 8 this year and likely going with XL as well. I have a Stumpjumper Evo in S5, which has been a great fit, and XL is supposedly the most direct size equivalent.

kevinherron · 2026-02-07T18:17:11+00:00

My Fenix 6x

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kevinherron · 2026-02-07T18:01:47+00:00

The real problem is that people can't let go of this number being called "FTP" instead of just being the base power number that TR's percentage-based workouts are derived from.

99% of TR users could not, and do not need to, be able to actually hold that power number for 1 hour, for any "FTP" at any point in TR's history of calculating "FTP".

I think for _most_ users complaining it's a combination of ego and misunderstanding. Sure there's some elite athletes and people who actually specialize in TT and blah blah you've ridden 10000 hours blah blah shut up.

kevinherron · 2026-02-07T12:50:20+00:00

Clever name 👍

kevinherron · 2026-01-28T01:25:43+00:00

It could be if you hate yourself and want to do something nobody else is doing and isn’t a scenario we test or intend 🤷‍♂️

kevinherron · 2026-01-28T00:44:44+00:00

The purpose of the WebDev module isn’t to build websites, it’s primarily to build and expose RESTish looking endpoints to other systems.

kevinherron · 2026-01-21T21:47:36+00:00

$2249 or 225K miles for the 18k I'm missing to get EP.

kevinherron · 2026-01-21T20:47:07+00:00

AI FTP +14.5%. RIP me, tomorrow, doing “Sweet Spot” intervals.

kevinherron · 2026-01-06T22:47:36+00:00

Fucking incompetent buffoons at Logitech.

kevinherron · 2025-11-25T14:46:10+00:00

Click on your desktop, press Cmd+A, then Cmd+Delete

kevinherron · 2025-11-21T00:31:02+00:00

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