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With a week later than the expected output, I finally released in Beta an MQTT broker completely developed in C# that can run on .NET Framework and .NET Compact Framework 3.9 (on systems with Windows Embedded Compact 2013) his name is ... GnatMQ ! It has the M2Mqtt library “core” with which it shares the features of MQTT protocol about the part of the connection to the clients and the messages management. Obviously, it is completely open source and available on CodePlex but is currently in Beta version (aspect numerous reports on your part!). Main features included in the current release : All three Quality of Service (QoS) Levels (at most once, at least once, exactly once); Clean session; Retained messages; Will message (QoS, topic and message); Username/Password via a User Access Control; Subscription to topics with wildcards; Publish and subscribe handle using inf ...
Today is "born" a new dedicated website by Microsoft on the Internet of Things that talks about the Internet of Your Things and highlights that the IoT can be achieved by each of us with his own "things" that can interconnect with each other through the Cloud. On the website you can find all the information about this new (or already mature ?) project on which Microsoft is focusing its business using what is already good for the embedded world (all operating systems of the Windows Embedded family to which I would add the .NET Micro Framework) and joining it to the powerful of the Cloud (Microsoft Azure is well known). It's true what the new CEO Satya Nadella said with intention to want "a cloud for everyone , on every device" for which the #cloud4device can be understood in its most general main, not only smartphones and tablets but also devices and "things" that connect to the big network ! You can subscribe to a newsletter that will begin on July 1st, but ... maybe from that date ... we'll see ...
If using 3.1.0.0 version you realize that Connect and Disconnect events are not raised ... it is correct ... they are not handled in the client and you need to update the library or ignore them !
I released an update M2Mqtt library (version 3.2.0.0) that lays out this oversight.
Following the code merge between the M2Mqtt client library and the future GnatMQ broker I made the mistake of including the SUBSCRIBE, UNSUBSCRIBE, CONNECT and DISCONNECT messages handling also in the client (of course without any sense) with the corresponding events.
The update is available as always on Nuget and I proceeded to update the corresponding M2Mqtt4CE component for Windows Embedded Compact 2013.
Also this time an update arrives on time for my M2Mqtt library now reached to version 3.1.0.0 ! The main updates concerning better management of QoS Level 2 , some client properties exposed to the outside but especially the fact that it assessed and added some requests that I received by users that obviously thank you ! Also, in some parts of the source code you will see a compilation directive that is conditional on the definition of the symbol BROKER ... why ? I standardized the library code of M2Mqtt with the code of a MQTT broker that I am developing and which will shortly be released in beta version. Its name is GnatMQ and the project is already published online on CodePlex and then open source. Please note that currently it is still a version in development and not completely stable but the release is imminent ! In addition to updating the project on CodePlex , I updated its package on Nuget ( which has now passed 1000 downloads ! ), the code in the Microsoft Gallery and the project M2Mqtt4CE to in ...
In this post, I talked about a bug in the current release of Windows Embedded Compact 2013 to which the build system was no longer able to recognize the .Net Framework after the update from 4.5 to 4.5.1 version. In the same post I also described a possible workaround to be able to continue to use Platform Builder with no problems waiting for an official patch from Microsoft.
With the January 2014 update that you can download here ... the bug has been fixed!
If you have used my workaround, you should restore everything as it was before starting from the sources.ce file in C:\WINCE800\public\common\oak\misc (removing the variable _DOTNET40ROOT) and restore the system PATH variable.
After this recovery step ... perform the update and everything will work as always!
My M2Mqtt open source library has finally come to version 3.0 with two important news ! In the first place, the operations of publish, subscribe and unsubscribe have become completely asynchronous. Until the previous version , the corresponding methods were synchronous even if the library raised related events on published message and subscription / unsubscription occurred. In particular , in the Publish() method the exchange of messages with the broker was run to ensure the required QoS ( PUBACK for QoS 1 , PUBREC , PUBREL and PUBCOMP for QoS2 ) while in the Subscribe() and Unsubscribe() methods handled the acknowledge ( SUBACK and UNSUBACK ). Now , these methods not bother to put a message in a queue and immediately return the message id itself , which is why there is a "breaking change" on the Subscribe() method that does not return the array with the "granted" QoS level. This array is still provided at the end of the asynchronous operation in the event args object of the corresponding event. I tal ...
On Saturday 15th of February was staged the second edition of Microsoft Embedded Conference which was held at the Holiday Inn in Naples and organized by the DotNetCampania community (I am a member of it), TinyCLR.it and Embedded101, this community that is a reference on Windows Embedded of which, I’m a "board of directors" member since November 2013. Also this year there was a good turnout of attendees even though it was Saturday, because the main topic was the Internet of Things and M2M Communication of which we hear persistently in the last period as the business of the future for the big network. At 8:00, the team was ready for the preparations and organization in order to accommodate very well the attendees and ensure that the event will start on time. As with all events, we started with the keynote of our president Michele Aponte, who presented the community and to whom I have given ...
This time Creg Duncan had to give more than usual explanations to justify the very first constant presence on the Coding4Fun blog!
“Today's Hardware Friday post is another project from our Friend of the Blog, Paolo Patierno (yeah, yeah, I know, it seems like I'm posting his stuff all the time, but hey, it's cool stuff) !”
I'm glad that my "small" open source projects had quite successful and this is the time of uNFC library that implements support for the NXP PN532 NFC chip for all Windows Embedded platforms (from. NET Micro Framework to Windows Embedded 8 passing Windows Embedded Compact).
About this library ... tomorrow it will be featured at the Microsoft Embedded Conference in Naples in a demo on Smart Home & Smart Factory System!
As always .... it is a pleasure to be there!
Today, preparing a Windows Embedded Compact 2013 image for an eBox 3310A and for the demo at Microsoft Embedded Conference in February 2014, the Windows 7 operating system (a virtual machine) decides to upgrade the version of .Net Framework from 4.5 to 4.5.1. Reboot the system and resume the job ... but the build system for Visual Studio 2012 has gone mad and the next attempt to build fails! A warning indicates that the .Net Framework 4.5 is not installed on the system and an obvious fatal error indicates that the compilation can not be done! I have found no official news from Microsoft to fix this problem but I have circumvented the problem in the following way .... First I open the file indicated by the fatal error, ie sources.ce in the path C: \ WINCE800 \ public \ common \ oak \ misc, which reports the error in case the environment variable _DOTNET40ROOT is empty. !IF "$(_DOTNET40ROOT)" == "" ! ERROR Error: Microsoft.NET Framework v4.x must be installed on your machine. ...
After the previous two articles describing the SPI and I2C buses and their use with the .Net Micro Framework, it is now finally time to see a practical application with my latest project available on CodePlex : uNFC – NFC library for .Net platforms ! Introduction : software and hardware support This library allows to use NFC integrated circuit connected to your PC (via serial) or to embedded system based on Windows Embedded Compact or .Net Micro Framework. It supports all three types of .Net Framework : .Net Framework 4.0 for PC based on Windows 7 / 8 or embedded systems based on Windows Embedded Standard 7 and Windows Embedded 8 Standard; .Net Compact Framework 3.5 / 3.9 for embedded systems based on Windows Embedded Compact 7 and Windows Embedded Compact 2013; .Net Micro Framework 4.2 and 4.3 for embedded systems like Netduino boards and .Net Gadgeteed boards; The library supports NXP PN532 chip but it also defines a little framework so that y ...
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