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Nick Craver @Nick_Craver
, 4 tweets, 2 min read Read on Twitter
Shout out to @mstum for reminding me 1Gb PoE USB splitters are completely viable for Raspberry Pis - now running a few off my UniFi PoE switches and using just 1 outlet on the UPS: amazon.com/gp/product/B07… Less wiring and if the network's up, the Pis are up, e.g. Pi-hole & Z-wave.
@mstum I dismissed them early because I thought "APs are pulling 5-6 watts max...not nearly enough power", since a Pi can eat ~2.4A a 5V or 12 watts. But that's nonsense, the UniFi switches can generally do 24-36 watts per port...the APs just don't need that. Sanity check appreciated!
@mstum The reason this model is so appealing to me is I have:
- PoE switches
- CloudKey
- Pis
- APs
- USG
- Modem
...all on 3 outlets to a UPS. With a chunky UPS, all of that can stay online 24+ hours after power is out. Plus, much less power wiring and mess.
@mstum A note to others: there is a slightly cheaper version of these, yes, but one is 100Mb and my link was 1Gb. If you have a Pi 3B+, they have 1Gb Ethernet so you'll really just want to spend the extra 4 bucks and have one that works with any model.
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Production is very, very rarely debugged in a debugger.
This warrants some explanation. Let me elaborate. When debugging something, you generally use a few approaches:
- Attach a debugger
- Artifacts from an event (e.g. an error log)
- A quick high-level debug dump of a running process (e.g. stack trace)
- Full memory dump
- Guessing
When you attach a debugger, you have to:
- Have said debugger installed
- Setup production around a debugger to some extent, e.g. GUI on the running machine
- Be willing to stall the process (e.g. timing out requests)

While 1 and 2 may be doable, number 3 is a hard no at scale.
Read 11 tweets
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Well hello there memory leak...let's see what you are.
It's times when I type !dumpheap without an argument that call for a Snickers.
Alrighty, let's see what these little guys are:
Read 25 tweets
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@StackStatus We are now stable and are digging into the contributing factors. The outage was ultimately caused by saturating the 20Gb network connection from our SQL Servers but the query generation differences in EF Core were the underlying cause. We're getting to the bottom of it now.
@StackStatus This query was being filtered client-side in EF Core (not SQL-side as it was with Linq2Sql). The .Where(...) was being applied client side after bringing back 52 million posts from SQL Server. This brought us offline. Still digging into why this happens.
@StackStatus While I will dig to investigate what happened here...we're just replacing it with Dapper instead. It's drastically simpler in this case.
Read 6 tweets

Related threads

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1/Assume I figured this completely out. It's like a crypto Rosetta Stone.
github.com/ufasoft/coin/b…
2/ and this IX ABC
github.com/ixcoin123/elec…
3/ this beertokens, iXcoin, Litecoin, and ABE
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1\n #Amazon has done much more for building and deploying #IoT devices in a secure and robust manner than any other ecosystem organization. Their focus? Help build and deploy more connected devices. If you are building connected devices, this summary report is for you:
2\n Both their arms #Alexa and #AWS offer solutions at both the ends: the device (h/w and s/w dev kits) and the cloud. So how does it help you, the device maker? Let's find out. Every tweet below is an Amazon solution. Let's start with Alexa first.
3\n Control via #Alexa 1: If you've built a cloud connected device, use the Alexa SmartHome Skill to link it to Alexa. Then users can asks Alexa to ctrl your device, which goes to Alexa cloud, then to your skill, then your cloud and finally to your device. developer.amazon.com/docs/smarthome…
Read 15 tweets
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I have been asked to recommend some non-mediocre books. I know many of you are very young, so here are

10 BOOKS YOU SHOULD READ BEFORE YOU'RE 30

Preferably, much earlier than that. If you're not this young... what are you waiting for to read these books??
1) To be anything, you need to create value, and for that you need skills.

This is the best book I know on how to engineer a career path that feeds you total domination on the skill front and gives you freedom.

Not an accident I put it first.

amazon.com/gp/product/145…
2) To be effective in the world, you need to understand how the world works - especially how it's trying to kill you ALL THE TIME.

You will re-read this book many times as you discover more of its hidden implications. Great investment.

amazon.com/gp/product/081…
Read 13 tweets
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Now that my book, Rulers, Religion & Riches, has been out over a year, I thought I would share its figures and tables. To the extent possible in 280 characters, I will place each of them in the context of the broader arguments made in the book.

amazon.com/gp/product/B01…

(THREAD}
Table 1.1 is a motivating table, meant to show that the contemporary Middle East is poorer, has worse governance, and is more subject to conflict than the "West".

The question is, given the Middle East's vast head start (by, say, 1000), how did we get to this point?
Figures 1.1-1.4 are also meant as motivation. They show the transition of densely populated areas from 800-1800. Urban population is our best metric for economic growth in the pre-modern economy. The transition from the "Islamic world" to W. Europe is clear.
Read 19 tweets
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Amazon Alexa secretly recorded private conversations and sent the recordings to random contacts - all without notifying users. 😱

fox13memphis.com/news/trending-… ht @sapna
Amazon rep: “This was an extremely rare occurrence.“

So we’ll just take your word for it then?

This is why we need transparency and accountability on privacy. Esp for tech cos like Amazon that are omnipresent in consumer lives AND also supply tech/services to gov/military/LE.
Many large tech companies (inc. Amazon, Google, Facebook, Microsoft) sell tech/services to gov, military, law enforcement, and political campaigns. There are NO guarantees that the data collected from consumer devices will not be used for those buyers.

wired.com/story/the-line…
Read 4 tweets

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