Windows Developer Day, Oct 10th, Vienna: Mixed Reality, Xamarin & more!

Mobile Developer After-Work

The Windows 10 Fall Creators Update brings an impressive array of new features for developers. At the Windows Developer Day, the Microsoft engineering teams will introduce the latest news for developers.

One of the most exciting is Windows Mixed Reality as a feature of the base operating system, bringing Virtual Reality to the masses with reasonably priced VR headsets. Additional topics include Xamarin, .NET Standard 2.0 and the XBox Live Creators Program.

MVPs (Microsoft Most Valuable Professionals) around the globe organize viewing parties. Through the Austrian mobility.builders mobile developer community and together with fellow MVP Helmut Krämer, I have the honor of hosting the local streaming party in Vienna. Continue reading “Windows Developer Day, Oct 10th, Vienna: Mixed Reality, Xamarin & more!”

Basics of Web Technology: HTML5, CSS, JavaScript, Accessibility & WordPress

Basics of Web Technologies

It’s important to know the basics of how the web works. In one of the introductionary lectures at Digital Healthcare, we take a look at HTML5, CSS, JavaScript & more. Understanding basic web technology is required to ensure that web sites have excellent usability as well as accessibility.

This includes how to make sure navigating the page works with screen readers, as well as that the design works well for people with e.g., (color) vision deficiency. Accessibility is especially important for websites and mobile apps of public sector bodies, based on a new directive of the EU that will come into effect in all member states soon. Continue reading “Basics of Web Technology: HTML5, CSS, JavaScript, Accessibility & WordPress”

Cross-Platform Universal Bluetooth Beacon Library Evolves

Universal Bluetooth Beacon Library

Thanks to the help of the new collaborator Chris Tacke, the Universal Bluetooth Beacon Library has evolved to its next level. Based on a modularized architecture, the library is now based on .NET Standard 1.3. Extensions provide the glue to the Bluetooth APIs of various platforms.

Currently, Windows 10 (UWP) and Android (Xamarin) are supported. The core library also works fine on iOS, Mac and Linux. Continue reading “Cross-Platform Universal Bluetooth Beacon Library Evolves”

Porting the NFC / NDEF Library to .NET Standard

NdefDemo App of the NFC Library, now based on .NET Standard

With around 20,000 downloads, the “NFC / NDEF Library for Proximity APIs” is the most popular NFC library for C#. The library has initially been released in 2012 and has since been extended to cover many standardized as well as common NDEF use cases – also thanks to the support of the netidee open innovation platform.

Lately, the underlying platforms have evolved, and now the library has adapted. The main NFC library has now been ported to .NET Standard, which is a common baseline that makes the library compatible to even more different platforms. The new version 4.1.0 is now available under the open source LGPL license on GitHub, as well as on NuGet.

In addition to running on Windows, the library now fully supports all platforms that support .NET Core (like Linux and Mac), as well as Xamarin for Android and iOS. This makes it significantly easier to provide NFC functionality across different platforms – especially now that the iPhone also finally supports the open NDEF standard within NFC through the Apple Core NFC framework. Continue reading “Porting the NFC / NDEF Library to .NET Standard”

.NET Standard Libraries and NuGet Package Wizard

Generating NuGet Packages from Visual Studio 2017

A few days ago, Microsoft has released  .NET Standard 2.0, which is the new dreams-come-true platform for libraries. Additionally, Portable Class Libraries (PCL) have since also been deprecated. Therefore, it’s about time to port my existing libraries.

In addition, also Visual Studio 2017 Version 15.3 with full support for .NET Standard 2.0 was released, as well as the latest Windows 10 Fall Creators Update Preview SDK. So, let’s get started!

.NET Standard vs. UWP

However, it turns out that UWP doesn’t yet support .NET Standard 2.0. For the UWP platform, the latest supported .NET Standard version is still 1.4, which is considerably less powerful.

Attempting to reference a .NET Standard 2.0 library from an UWP app leads to errors, including the following that gives it away:

Upgrading the UWP project to the latest SDK Preview for the Windows 10 Fall Creators Update Build 16257 doesn’t change anything; both the SDK and the new Visual Studio 2017 version 15.3 can not yet use .NET Standard 2.0 in conjunction with UWP. According to Microsoft, that will be coming soon with the next UWP version. Continue reading “.NET Standard Libraries and NuGet Package Wizard”

Using Netgear Arlo Security-Cameras for Periodic Recording

Automating Arlo Camera Recording

The Arlo security camera by Netgear is one of the few cameras that doesn’t need a power supply, so is easier to use outdoors. The cameras have motion-sensing integrated and upload a short video sequence around the motion event to the Netgear backend. Great about the Arlo ecosystem is that this is possible with the free plan as well; you can access the recordings of the last 7 days already with the free basic plan.

For my use case, I wanted to also take periodic pictures / recordings. These can then later be stitched together for a time-lapse. Continue reading “Using Netgear Arlo Security-Cameras for Periodic Recording”

How to Read the Battery Level of Bluetooth LE Devices

Microsoft Surface Dial

At the Microsoft Build Tour in Vienna, I had the opportunity to present an enhanced version of the Bluetooth Beacon talk. With the Windows 10 Creators Update, Microsoft released a massive update to the Bluetooth LE capabilities of the OS. This finally allows developers to use the full potential of modern Bluetooth scenarios, including sensors, wearables and beacons.

At Build 2017, Microsoft released three new sessions explaining the capabilities of the new APIs:

  1. Intro to Bluetooth LE Explorer
  2. Unpaired Bluetooth LE Device Connectivity
  3. Bluetooth GATT Server

Even though the sessions reference example code and blog posts that should have been released together with the session recordings, still none of that is available so far. That gave me the opportunity to explore the new APIs based on the short documentation overview page and the videos. Continue reading “How to Read the Battery Level of Bluetooth LE Devices”

Event: Mobile Developer After-Work #15: Next Generation Apps

Mobile Developer After-Work #14

Mobile Apps are no longer simple tools and games. They have grown to amazingly complex systems. Which ingredients are necessary to successfully develop a next generation app?

You will need Artificial Intelligence / Machine Learning. Only the best performance will satisfy your customers – or do you want to wait more than a few seconds in a mobile app? How can you visualize your user interface with HoloLens?

At the #mdaw15, you will learn how to develop and plan such apps with modern frameworks. Join the next After-Work event in St. Pölten for free at https://mobility.builders/

What is a Mobile Developer After-Work Event?

#mdaw events are mixtures of conferences with more casual meet-ups. Different expert speakers approach an overall topic from diverse perspectives. Afterwards, there’s plenty of time for networking and discussion amongst attendees – with snacks and drinks, of course.

The events target mobile developers and decision makers. The goal is to dive deeper into relevant and already known topic areas, as well as to keep up to date with the constantly evolving and changing toolset of the mobile world.

In the meantime, we can look back to 14 previous #mdaw events. Topics so far included business apps, digital healthcare, Xamarin, user experience or a Refugee Hackathon. We’re organizing the events with technology partners like Microsoft, Oracle, IBM, the City of Vienna and many others.

The community has grown to around 500 attendees, and we continue to get more and more developers on board with each event!

Together with Helmut Krämer, I’ve founded the community in 2013 and am proud that it’s still around. We’ve had a tremendous impact on the Austrian developer community so far. With the upcoming #mdaw15, we’re extending the reach geographically and host our first event outside of Vienna, to reach even more developers!

Video: Everything You Need To Know About Bluetooth 5 & Beacons

Bluetooth Beacon Session by Andreas Jakl

With the first Bluetooth 5 devices just released (first and foremost the Samsung Galaxy S8), Bluetooth Beacons like Apple iBeacon and Eddystone by Google gain a lot of potential. Increased range means future beacons will cover a much larger area, without increased power consumption. With the payload increase of beacon advertisement frames from 31 bytes to 255 bytes, the amount of information transmitted by beacons can substantially increase.

In my session about Bluetooth Beacons at the Mobile Developer After-Work #14: Creating Immersive Environments, I provided a short update about the latest news. Unfortunately, recording of the live session at the event failed. Therefore, I’ve re-recorded it – you will miss the live experience, but I did have a little more time for more detailed explanations of some important facts, so it’s well worth watching again even if you have been at the #mdaw14 Event!

The 45 min recording is now available on YouTube.

Continue reading “Video: Everything You Need To Know About Bluetooth 5 & Beacons”