Scott Hanselman

Diabetes Technology: Dexcom G5 CGM Review - So much wasted potential

October 13, '15 Comments [43] Posted in Diabetes
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Dexcom G5 for iPhoneAs you may know, I'm a Type 1 Diabetic and have been for well over 20 years. I wear a Medtronic Insulin Pump 24 hours a day and use a Dexcom CGM (Continuous Glucose Meter) to monitor my blood sugar, also 24 hours a day.

This post won't explain how diabetes works to you, so check these posts out (or this video) first if you're not familiar.

Moving from a Dexcom G4 to a Dexcom G5

A CGM (Continuous Glucose Meter) doesn't keep you from pricking your fingers. You'll still do finger sticks in order to calibrate a CGM, at least twice a day.

The Dexcom G4 "with Share" worked like this. There was a small transmitter that is attached to me, and it talks a proprietary RF wireless format to a Receiver and then the Receiver talks Bluetooth LE to your iPhone, like this picture below.

Once the sugar number got to my iPhone it's then optionally uploaded to  the Dexcom Share Cloud. My wife can install the Dexcom Follow application on her iPhone and see my sugar on her phone. She also gets the same notifications and warnings I get.

How the Dexcom G4 system works

When you "upgrade" to the G5 from the G4, you'll likely do what I did. I called Dexcom support to see if I was eligible. They had a US$199 upgrade fee which I paid, and the G5 transmitter showed up a week later. I then called them back to get an "upgrade code" which was a 12 digit unique number (GUID) that I had to enter into their Dexcom Studio application on my Windows machine. I plugged in my Dexcom G4 with Share Receiver to my Windows machine using Microsoft USB and ran the upgrader. I needed that upgrade key. Then about 20 minutes later the G4 receiver (remember it talked RF to the G4 transmitter) is now a G5 and only speaks Bluetooth directly to the Bluetooth-enabled G5 transmitter. That means it works like this now:

How the Dexcom G5 system works

The G5 software that runs on the iPhone can also upload to the same Dexcom Cloud which means my wife's Dexcom Follow app *works unchanged*. This was a relief.

The Good

  • If I forget my Receiver device at home I can still see my sugars on my phone. This is huge if you're someone who didn't want to get a Dexcom CGM simply because you didn't want another device in your pocket. That is no longer a blocker.
    • You can carry and use either or both of them. However, if a family member is "Following" you and needs to see your numbers, only the phone is uploading them.
    • You can calibrate on either device and they'll both stay in sync. This was a nice touch as I was concerned I'd have to treat the iPhone as a "Virtual Receiver" and calibrate on both devices twice. Just calibrate on either device and the other sees it.


The Bad

First I want to say that I REALLY appreciate Dexcom, the company, the product, and the people, and I appreciate what you've done for myself and for Diabetics everywhere. The Dexcom sensor technology is unparalleled and a fundamental life changer. I can't imagine living without my CGM and I wholly and completely recommend a Dexcom CGM for ANY and ALL Type 1 Diabetics who want to get a real clear view of what's happening inside your body.

That said, I'm going to be very honest here, so if you work for Dexcom, please take my feedback as what it is. It's firm, crisp, actionable feedback. You should fix these things. They are bad and wrong.

There's no gap filling.

With the G4, if I had the receiver in my pocket but my phone was elsewhere, the phone would "fill the gaps" and load in missed readings that might have happened while the phone and receiver were apart. This doesn't happen anymore and it sucks. Sometimes the phone misses readings and sometimes the receiver misses them and I don't get a complete smooth curve even though the data seems to be available in the ether. As a techie, I'm assuming this means that the new Transmitter has no memory and just yells out the last reading over Bluetooth until a new reading shows up. IMHO it should remember maybe 5 to 10 and sync up gaps when possible. And if the receiver has records the phone doesn't or vice versus, for goodness sake, close the gaps.


The phone just isn't a reliable receiver.

Remember when I said that having the G5 means you don't need the phone with you all the time? Well, kind of. I'm not sure that's 100% true. Here's 3+ hours of data that was completely missed this morning. The phone was 3 feet from my transmitter at all times, sitting on my night stand. My physical receiver was under my pillow and picked up the whole nights numbers, but the fact is, numbers were missed.

Yes, Bluetooth is a troublesome thing, but my Tile BT devices NEVER lose a connection. My Apple Watch never loses connection. My Microsoft Band doesn't lose connections. My car doesn't lose connections. You get the idea. I don't trust the Dexcom G5 software to use only my phone to view my data. I just can't avoid a lost hour.

Also, it's unclear to me how this data gets over the the iPhone from a software perspective. Is it a background task? Can the Dexcom software get ejected from memory when playing high memory pressure games? I need these answers.

I'd like to have a Dexcom engineer tell me/us that this is a transmitter/phone/software/hardware/radio/whatever problem, but who knows. They must know it's not as reliable as the physical device.


The Missed Opportunities

Please, Dexcom Engineer who must be reading this post, read these and explain.

  • There's no Watch app? The Dexcom G4 has an Apple Watch app, but this "upgrade" doesn't include one. Not cool. Don't remove functionality. I don't want to  pick up my iPhone and run an app every time I want to see my sugar. Glance-able data, people. 
    • complications_explained_2xWatch OS2 has the idea of "complications" which are AMAZING. Dexcom needs to let me put my sugar in an active area on my watch screen. To not to do this hurts. It hurts every day as I glance at my numbers hundreds of times a  day.
  • There's a HUGE amount of wasted whitespace in the chart. Huge. Notice that my goal area (the gray area) is less than 10% of my screen space. The area that I'm NOT supposed to be in (from 150 and up is huge). Please let us change the Y-Axis. Please. 300 to 400 mg/dl is far too much Y-axis for many folks. Give us a logarithmic scale. Let me change it to 200 or 250 until I get higher.
  • The app scales on iPhone 6+. If you want to play in the Apple App Store then play correctly. Make nice scalable graphics, and make it look pleasant everywhere.
  • No interactive graph until I landscape the device. The main screen is static. I can't change the axes (Y or X!) and I can't touch existing records. This is a dumb app on a pocket super-computer. Not being able to explore my data is unacceptable.
    • That said, I can flip the device into landscape and look at up to 24 hours in the past, and run my fingers over the results. Why not portrait?
  • No "iOS widgets." iOS has the notion of Widgets. Little active areas of contact for data like my calendar or the weather. I need to see my Glucose here. Again, this is a huge missed opportunity. Huge. Do it now.

Net net, was it a good upgrade? I'm not sure yet. The sensor tech is amazing. The accuracy remains amazing. I like having the option to not take my receiver with me, but the fact that I can't trust the phone not to disconnect when it's in my pocket on the same side the transmitter is remains a serious concern. Buy the G5 if you like Tech and new Stuff, but know that the G4 is still a great device, it's just one you have to carry with you no matter what.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Moving beyond Beginner when 3D Printing and becoming a Handy Person

October 9, '15 Comments [11] Posted in
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OK, let's just say it. I'm not that handy and I'll never be handy. I'm consistently impressed with all my friends and family members who put up pictures of their amazing dining room tables made from scratch. "Ya, I raised this tree from a sapling, cut it down, and made this table with tools from the 1700s. #diy."

Every time I pick up a saw or a drill I feel like I'm faking it. But I try.

The most important thing when making, I think, is to identify your comfort zone and then push past it a little bit.

I've been doing some 3D Printing lately. In fact I'm being teased by people at work who say the printer is always going whenever they call. I say, if I'm going to make a big purchase like this, it needs to be used all the time or non-technical spouse will tell me that buying it was a mistake.

Here's some of my 3D Printing posts so far:

I'm still a beginner, but I think I'm quickly moving into intermediate skills when printing things on a 3D Printer.  Here's some lessons I've learned.

Making a Minecraft Chess Set

3D Printers are marketed wrong.

Listen up, 3D Printer makers, you're selling these things wrong. I was over at Home Depot recently, it's a lumber/tools/fixit shop here in the states (where Handy People go to cut wood, I guess) and they had a Dremel 3D Printer on the end of the aisle. I have a Dremel, so asked a few questions and pretended to be a new customer. They had setup a bunch of little colorful plastic toys. You've seen these demonstrations, right? It's all the little crap like Yoda heads and stuff. It has its place, but at some point you're like "OK, but what can I make that I can use?"

It's a Home Improvement Store where Handy People go, not a Hobby Shop. Show me stuff I can make that will fix my house!

3D Printed stuff and a yoda head

The first thing I printed was a wall bracket for my Dyson Handheld Vacuum. (Again, the goal here is to have non-technical spouse appreciate that I, too, am a Handy Person.)

Making a dyson vaccum bracket

3D Printer manufacturers should showcase all the cool utilitarian stuff you can make. Which leads me to...

Material/Filament - There's more than just vanilla PLA and ABS

When you print, you use filament which are spools of plastic spaghetti. There's lots of materials but the first one we all use is PLA, which is a plant-based biodegradable plastic. Later folks move on to ABS Plastic, which is what LEGO bricks are made of. I haven't gotten that far yet and have only printed PLA...however.

There is a company called Proto-Pasta that makes and sells "exotic filaments" including PLAs that include Carbon Fiber, Magnetic Iron, like a Conductive PLA, or High Temp PLA. The High Temp PLA can be head treated (put them in the oven) and they'll then become very heat resistant AND a lot stiffer and stronger.

On the left in this pic is a clear High Temp PLA print of a bracket I wanted. Then I put it in the Oven for 20 min at 230F. The one on the right has crystalized and changed from translucent to opaque and it's VERY STRONG.

Proto Pasta's High Temp PLA

I mention this because discovering and using this High Temp PLA opened up a whole world to me. Now I can try printing simple circuit boards with Conductive PLA! The point is, I was playing it safe, but now my possibilities have multiplied. 

Software - Way more important than I thought

As I mentioned in my post on The Basics of 3D Printing in 2015 there is a lot of great open source software that you can use to 3D Print with. In fact, you can make your own 3D printer using off the shelf parts and open source design, so there's no real need for you to spend any money on software.

But. I was talking with a 3D Printing expert at a MakerFaire and they gushed about Simplify3D. It's an all in one 3D Printing software that can take in 3D models, arrange them, slice them (slicing means turn the 3D model into x-y-z movements for the printer) and so much more.

Before I was using multiple apps, constantly tinkering, fighting with the built-in software, moving files from app to app in a disjoint workflow. With Simplify3D not only is it easier, but the parts are better. How? It is just that much smarter software, IMHO.

Simplify3D is amazing

I love this view below. I've got a bracket I'm going to print, and the have colored the "moves" of the print head intelligently showing how many mm per min (mm/min) the print head will move. See how the software is smart about the speed of the supports versus the walls versus the parts that stick up?

Simplify3D made the Minecraft Chess set possible when other systems were creating weird supports or moving too fast and tipping over the fragile parts.

Simplify3D is amazing

Seriously, if you're moving to intermediate like I am, pay the money and buy Simplify3D. I don't say that lightly. I'm just scratching the surface and learning what it can do, but so far it's already been worth the money. I have no relationship with the company and there's no affiliate code on the link.

Fear - I was still afraid of the device...until I took it apart

For the most part I've been using my Dremel and Printrbot 3D Printers without issue or incident. However after a few hundred hours of successful printing a snag in the filament spool as it unraveled somehow caused a clog in the Dremel. I was kind of freaking out. 3D Printers are somewhat persnickety and when you have one well-calibrated you don't usually want to mess with it. I thought.  

Taking apart a Dremel

I called Dremel Tech Support and let me tell you, someone give Adrian Malone at Dremel Consumer Services a raise. I called them up and Adrian was in the middle of a print. First, I love that, folks that use their products. He say he had over 1000 hours on that machine (the machines keep track) and he talked my courage up until I felt prepared to take about the whole head and unclog it. His instructions were crystal clear, he was patient and kind. All the things Tech Support should be. Gave me his extension but told me anyone could help...and I have a feeling they could. I've heard tales of Dremel Tech Support being amazing for these printers before this cemented it.

Keep Printing - If you're not using it, you're not learning

My 7 year old and I are printing a quadcopter from places called "CrossFire 2" as a (many) weekend project. We printed a money clip for his allowance last week. We just finished the Minecraft Chess Set today. We're always making, but more importantly, we're always learning. \

3D printing a Quadcopter

Are you 3D Printing? What kinds of stuff do you make? What tips did I miss? Sound off in the comments.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Penny Pinching in the Cloud: Your web app doesn't need 64-bit

October 6, '15 Comments [21] Posted in Azure
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Often times I hear folks say that they need (or want) 64-bit support when they deploy to the cloud. They'll deploy their modest application to Azure, for example, as a Web Application, then immediately go to the settings and set it to 64-bit. So many years later and it's "do I need 64-bit" is still confusing to a lot of people.

Change your Azure bitness settings here

I made basic Hello World ASP.NET app and deployed it. Now, I go to that Web Apps "blade" in the Azure Portal, click Tools, then Process Explorer (after exercising the app a little.) I'm running 32-bit here. The K is the Kudu "sidecar" deployment site (for things like Git deploy and diagnostics), and the other icon is the production site.

30 meg working set for IIS in 32 bit mode

Now, I'll swap it to 64-bit and exercise the web app again. Remember, this app is just a super basic app.

102 meg working set in IIS in 64-bit mode

See how the working set (memory) jump? It's a little extreme in a hello world example, but it's always going to be bigger than 32-bit. Always. 64-bit'll do that. Does your site need to address more than 4 gigabytes of memory from any single process? No? Then your web app probably doesn't need to be 64-bit. Don't believe me? Test it for yourself.

I'll go even further. Most web apps don't need 64-bit, but here's the real reason. If you stay 32-bit when putting your Web Application in the cloud you can fit more applications into a limited space. Maybe your Medium App Service Plan can actually be a Small and save you money.

Until 64-bit only is the default in things like Nano Server, today you can fit more Web Apps into limited memory if you stick with 32-bit.

I personally have 18 web apps in a Standard Small App Service in my personal Microsoft Azure account. They are sites like my podcast Hanselminutes and they get decent traffic. But most never get over 300-600 megs of memory and there's literally no reason for them to be 64-bit today. As such, I can fit more in the Small App Service Plan I've chosen.

18 web apps in a single app service plan

Remember that the Azure Pricing Calculator isn't totally obvious when it comes to Web Applications. It's not ~$55 per Basic Web Site. There's a Virtual Machine under there, they call the whole thing an "App Service Plan" and your Web Apps sit on top of that plan/VM. It's really $55 for a plan that supports as many web applications you can comfortably fit in there.

The cloud is a great deal when you're smart about the resources you've been given. If you're using Azure and you're not using most of the the resources in your service plan, you're possibly wasting money.

What Penny Pinching in the Cloud tips do you have? Disagree with this advice? Sound off in the comments.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Introducing ASP.NET WebHooks Receivers - WebHooks made easy.

October 2, '15 Comments [16] Posted in ASP.NET | Open Source
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ASP.NET Web Hooks Receivers general architectureThere's been a lot of enthusiasm lately about the direction that ASP.NET is going lately, and rightfully so.

However, while ASP.NET 5 is cool and exciting, it's also not yet released (at the time of this writing, Beta 8 is being worked on). There are very cool things happening around ASP.NET 4.6 which is released and ready to go live today. Something else that's VERY cool that I want to explore today is ASP.NET WebHooks, which just came out as a preview and is being actively worked on.

Just as there's Web Forms, MVC, SignalR, Web API and they are all components within ASP.NET, you can think of Web Hooks as another member of the ASP.NET family of technologies. When you want it, it's there to plug in. If you don't use it, it costs you nothing in weight or runtime.

What are WebHooks?

Let's start with the What Are They part of the conversation. WebHooks are a convention. They are HTTP callbacks. Moreover, they are "user-defined HTTP callbacks." You and/or your app signs up for notification when something happens and your URL endpoint will get an HTTP POST when that thing happens. WebHooks can and should be RESTful as well. That means if you have a nice RESTful Web API then adding WebHooks to your application should not only be easy, it should a natural and clean extension.

So what? Why do we need a library for this?

Technically you don't, of course. You could theoretically implement the WebHooks pattern with an HttpHandler if you felt you had something to prove. You could more reasonably do it with ASP.NET Web API, but the general thinking is that if there's a clear and common pattern for doing something then it should be made easier and codified for correctness.

Even more, since WebHooks is such a common pattern and it's being used by folks like Dropbox, GitHub,MailChimp, PayPal, Pusher, Salesforce, Slack, Stripe, Trello, and WordPress then it'd be nice if ASP.NET came with support for these right out of the box. And it does. Support for receiving all of these and more is included.

There is also a need for easy ways for your applications to send events as WebHooks. In order to do that you need to manage and store subscriptions, and when the time comes to correctly make the callbacks to the right set of subscribers.

ASP.NET WebHooks

ASP.NET WebHooks is open source, being actively developed on GitHub and is targeting ASP.NET Web API 2 and ASP.NET MVC 5 today. It helps deal with the administrivia involved in dealing with WebHooks. It was announced on the Microsoft WebDev blog (you should subscribe) a few weeks back.

There's some great docs already being written but the most interesting bits are in the many examples.

When you install ASP.NET WebHooks you get a WebHook Handler that is the receiver to accept WebHook requests from services. Using a GitHub WebHook as an example, you can easily make a new project then publish it to Azure WebSites. GitHub WebHooks are required to use SSL for their transport which could be a barrier, but Azure WebSites using the * domain get SSL for free. This will make your first WebHook and testing easier.

A good starter WebHook to try creating is one that gets called when an event happens on GitHub. For example, you might want a notification when someone comments on a GitHub issue as a first step in creating a GitHub bot.

The default routing structure is https://<host>/api/webhooks/incoming/<receiver> which you'll put in your GitHub repository's settings, along with a SHA256 hash or some other big secret. The secret is then put in a config setting called MS_WebHookReceiverSecret_GitHub in this example.

public class GitHubHandler : WebHookHandler
public override Task ExecuteAsync(string receiver, WebHookHandlerContext context)
string action = context.Actions.First();
JObject data = context.GetDataOrDefault<JObject>();

return Task.FromResult(true);

In this tiny example, the "action" string will contain "issues" if someone comments on an issue (meaning it's an event coming from the "issues" source).

Once you've been triggered by a WebHook callback, you can decide what to do about it. You might want to simply respond, log something, or start a more sophisticated process. There's even a way to trigger an Azure WebJob with this new extension.

More WebHooks

Sending WebHooks is similarly simple and there's already a great post on how to get started here. Finally there's even some skunkworks tooling by Brady Gaster that plugs into Visual Studio 2015 and makes things even easier.

What a lovely dialog box for making ASP.NET WebHooks even easier!

Go check out ASP.NET Web Hooks and give your feedback in the GitHub issues or directly to Henrik or Brady on Twitter!

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Review: TP-Link AC3200 (Archer C3200) Wireless Router

September 29, '15 Comments [49] Posted in Reviews
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TP-Link AC3200 (Archer C3200) I've always been a Linksys or NetGear router person. I loved the legendary Linksys WRT54G and ran DD-WRT on it for years. A while back I updated my router to the Linksys WRT1900AC. This router was supposed to be the second coming of the WRT54G and promised enthusiastic support for alternate firmware. For about a year I ran the WRT1900AC with the stock firmware as there was a bit of controversy as to what that support would look like. Fast-forward a bit and it appears that Linksys and Marvel have been working together to solve some technical issues and have reached out to the OpenWRT and DD-WRT folks but unfortunately there is still no release place for DD-WRT for the WRT1900AC. I am tired of waiting and some recent instability in the stock firmware has got me shopping around.

I did some research and decided on the TP-Link AC3200 (Archer C3200). Now, before you say it, I will. This is a prosumer router. It's not cheap. But so far, it's been brilliant. I've tired $50 routers and they tip over with what I throw at them. I've got a minimum of about 20 devices on the network at a time, and often as many as 35-45. I want to be able to manage them differently, apply QoS (Quality of Service) rules, as well as segment my network. However, I am not a network engineer and I don't feel like being one. I've also had issues with range in the past but I don't feel like having two routers and one SSID. So far, it appears that this TP-Link Archer C3200 router can handle everything I throw at it.

TP-Link AC3200 (Archer C3200) 

First, let me say that this router looks like a UFO. It's a very dramatic design, but it's for a functional reason. Those are six folding antennas on the top.


Installation in my home took about 30 min from the moment it left the box until the whole house and every device was set up. I personally found the web interface to be simpler and more organized than any other router I've ever used, and I've used them all.

In this screenshot you can see that there are currently 18 devices connected and there are three wifi networks. I really like this feature. I've setup my own 5GHz SSID for my office, while the family gets their own 2.4GHz WiFi Network, and Netflix/Streaming/XBox devices get their own 5GHz SSID. It's nicely compartmentalized. Even more, I could optionally turn on one or more Guest Networks when folks visit from out of town. This gives guests internet, but keeps them off from seeing internal devices.

TP-Link AC3200 (Archer C3200) Wireless Router UI

If the idea of three SSIDs is too much for you, they also have a feature called "Smart Connect" which basically collapses a 2GHz and two 5GHz SSIDs and associated channels into a single Smart SSID that will abstract 802.11bgn across many channels. You get one SSID (Wireless Network Name) and the router handles the rest, automatically putting your devices on the right network given their capabilities.

There's also great Parental Controls built in, where you can set a Time Schedule per device. For example, you could make it so your child's iPad could only access the internet during certain times of the day. You would need turn off iOS Mac Address Randomization for this to work, I believe.

This TP-Link AC3200 (Archer C3200 also has some light NAS (Network Attached Storage) features that allow you to access disks via FTP, DLNA, or SMB (meaning you can talk to it via \\ROUTER\share for example). You could also even expose a disk over FTP externally if you wanted to. The router can also be a print server and make any USB printer a wireless/network attached printer which could be helpful if you've got a home office.

For the tech enthusiast/prosumer user the only nit I would say could use improvement is the Bandwidth Control (QoS) panel. It could be a little friendlier. For example, I can certainly figure out the IP Range and Port Range for Xbox Live or Netflix and set the Bandwidth rules, but since those are already pretty well understood it would be nice if there was just a dropdown or set of smart defaults. For example, we would ALL want to be able to check a box that says "make sure Netflix doesn't get slow when my spouse checks email." This dialog could be simpler.

Aside: My spouse asked me why Netflix gets slow sometimes when other people are streaming or pushing the network. I said that it's the same reason that the shower water changes temperature when someone flushes the toilet elsewhere in the house.

TP-Link AC3200 (Archer C3200) Wireless Router UI

So far I've been VERY happy with this router. Set up was a breeze, perf has been fantastic, and there hasn't been a single hiccup. I'll report back later.

Do you have this router? Or do you recommend another router? Sound off in the comments below.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.