WebGL Island Ball

Developed using CopperCube…

TCP home server test client

With the previous post setup I’ve written a very basic example of how to test the server. At the moment, there are no back and forth communications, just a simple send of a 4 byte header.

Run the server program first, and then run the test. These can actually be run in the same order from Eclipse.

The good news is, this also works over the internet. The ‘Global’ in the code hold a string of my web server address and also the port that my router has open.

So, all working as expected.

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The output from the server will be:

WLGfx Home Server - Starting up
Shutdown hook attached
TCP Server thread started...
TCP Incoming socket handler
Got header: HEAD

Java server test 1 [UPDATED]

My first test for Java as a console daemon. There’s not much here at the moment and the project is in Eclipse IDE.

From Eclipse, right click on the project and select export and then export as a runnable jar. Then in the terminal just type:

java -jar myexportedjar.jar

The JVM will continue to run as long as there are non daemon threads still running as in the below code. Also note that the hook handler allows catching of CTRL+C and other errors.

UPDATE:

I’ve now added the actually tcp server code which has a timeout on the server socket to allow for the thread to shut down safely. And a thread to handle each incoming connection.

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(I’m currently not well at the moment but I’m plodding on with some studies.)

Testing out TCP server over the web (my IoT stuff)

So I have this idea where I can take photos on my phone or save images from the web and then send them directly to my PC.

I’m currently using a Sky router in which I have enabled a port redirect to my PC. That’s all working. And I’ve got an external web address which re-routes to my PC also. That’s all working as I can host a website on my PC and access from outside.

The first pitfall was I started a console application in Qt to be a TCP server, but, deploying Qt applications to anywhere can be a huge pain in the butt.

So now I’ve decided to pick between a Java server or a C/C++ server. The issue I will have with a standard C/C++ server is image handling when it comes to working with them in the future, whereas Java has built in Bitmap libraries. Although I could add a 3rd party library to get around this, Java has lots of other libraries.

The other issue is speed. C/C++ has raw speed and that it. But because its a server, speed shouldn’t really be an issue for most things.

I’ve already successfully got the address of my PC over the internet and in the past had a basic TCP communication test working. This time it’s for real.

Okay, I’ll try out a Java project and see how it goes.

My current stack development

Linux headless server

Once everything is deployed, the linux distribution will have the desktop stripped and left to run headless.

UDP server

General broadcasting of the servers location on the network along with the current time 4 times a second as the end point devices have no internet connection and no time.

TCP server

Used for communication between the server and devices. Content is managed through TCP instead of FTP as it is more secure.

C/C++

The software manages the servers UDP and TCP communication and also handles other commands when necessary from the web server. UDP is used for streaming DVB-T data across the network. Continually running daemon in linux.

Apache Tomcat 7

The Java based web server.

Google Web Toolkit (GWT)

The web framework for both front and back end web server. Used to manage user logins and session authentication. Manages the devices deployment. Mainly in Java. The web server is a large project.

Android Studio and Qt 5.7

Used to write the software for the end point devices.

GWT IFrame DialogBox example

In GWT, being able to load external pages comes in extremely handy when you want to pass on a lot of the design work to another team. This can be achieved by loading an external page elsewhere on the web server into an IFrame and wrapping the existing widgets.

Most GWT widgets can be wrapped, buttons, DIV’s, check boxes, etc.

Unfortunately I’ve not found a way of wrapping a HTML table. The only way around that is to have the table on the existing HTML page in a DIV, clear the DIV and programmatically add the new table which can be styled using the pages CSS. However, another problem arises with CSS which is you cannot use table header and footers CSS.

Anyway, below is a quick and simple way of loading an external page into a DialogBox using an IFrame and wrapping the buttons. You might notice that I’ve cleared the DialogBox CSS style.

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More stuff August 2016

Very rarely do I update my website. That’s because I work all day and get very little time at home to actually work on my own stuff. However, I can update on a few things.

My knowledge of Java has improved vastly that now it’s rare I use google to solve my problems for me. Personally I wouldn’t use it for my own projects, except for the web server I will eventually start work on. Lots of people still say that there is now speed difference between Java and C++, but there is when you are running constant loops in code.
Google Web Toolkit or GWT. I’ve used this extensively for over a year now and I do actually like it more and more as the months go by. More recently, I’ve figured out how to manage logged in users and session management. I usually have a tomcat user assigned in Linux which the back-end can use, away from the web server to do it’s storage and data crunching. LibGDX also uses GWT and with the experience I’ve had, I’ve got a few things up my sleeve.
Qt… What more can I say. Every new version that comes out it gets more and more support. Recently I have figured how to call Java functions from Qt’s C++ on the Android platform which can be used for lots of missing features from native.
I still haven’t got round to playing around more with Python which I really want to do. As a scripting language it looks great. And for it’s mega bloated support for everything and anything (API’s etc), there’s no end to what it can do. Ideally once I get to getting good at it I want to be able to quickly prototype stuff to be redone in C++ or Java.

For the time being that’s it.

My plan for the very near future is to get some more stuff done on my website using the GWT back-end.

Work ‘Smarter’ not ‘Harder’ as a programmer

I’ve just come across a question posted on Quora which I tend to peruse through daily out of interest, and I can across the question:

What are some uncommon ways to work smarter instead of harder?

One person gave a list of answers which were very interesting and tickled my fancy. In short before I explain my personal experiences, here they are:

Learn to say “No.”
Sleep at least 8-9 hours
Don’t be a night Owl. Work in between 5am-10pm not from 10pm-5am
Stop multitasking.
Take more breaks: respect your natural attention spans
Spend time in nature
Move around and work in blocks
Limit your to-do list
Measure your results, not your time
Build “getting ready to work” routines
Track what you’re wasting time on
Exercise daily even if you think you have no time
Believe that you can do it

And being employed now for a while as a professional programmer after a lifetime of being a hobbyist here’s my thoughts on those points…

Learn to say “No.”

This is probably one of my failings because I’m quick to tell others they ought to ‘learn to say no’, it’s hard to actually do it yourself. There are times when I need some wind down time and I’m needed elsewhere at other times which doesn’t help me get that proper chill time at the weekends especially.

Sleep at least 8-9 hours

On average I get about 7 hours. Usually at the weekends, I fight the urge to sleep during the day in order to keep my sleep pattern regular.

Don’t be a night Owl. Work in between 5am-10pm not from 10pm-5am

Going from a hobbyist programmer to an employed programmer has seen a huge change in the hours I code. Years ago I would work through the night until the sun came back up. Now, I get home and just read stuff online and do no coding in my spare time.

Stop multitasking.

A programmer needs to focus on the project they are working on. Ask them to do something that doesn’t relate will throw them miles off track. Just just distractions can take them right out of the zone just for saying ‘hi’ to them.

Take more breaks: respect your natural attention spans

I’ve found that taking breaks regular helps immensely. I used to often find myself getting stuck at points and clock watching before I left the screen. That was counter productive to progress. Now when I get so far and need to give my thoughts and brain a rest, I get up and go for a quick wonder around.

Spend time in nature

Oh… Errr… Maybe I’ll plan for this one.

Move around and work in blocks

With working on large projects, I now tend to break it up into many smaller chunks and work through each piece.

Limit your to-do list

Just like the above, but when it comes to planning, I never set too many targets for the next days worth of coding. It’s usually just about two things I plan to get through and if I do manage more then it makes me feel better for it.

Measure your results, not your time

This is learning patience too. Working on large project is extremely time consuming. As I mentioned above, by breaking the project down into many smaller parts, it makes it easier to see progress being made.

Build “getting ready to work” routines

I do… I get to work… Make a brew… Read some interesting stuff for at least half an hour… Then within an hour after work starts, I am getting into the zone. Sometimes I get quickly zapped out of it when other members of staff start having loud conversations.

Track what you’re wasting time on

This is definitely another matter that I’ve learnt over the past couple of years. There’s been times when I’ve tried out something and dumped all the code only to start again a few times. Now I make small unit tests to make sure I know what I am doing before it gets implemented into the project. So much time can be wasted by having to backtrack a shed load of junk code.

Exercise daily even if you think you have no time

I don’t have time… I really need to but I haven’t yet got around to it. I will do as soon as I possibly can.

Believe that you can do it

This is not an issue with me. When I first started at the position I’m in now, I was thrown in the deep end and I had to create my own paddles and floats. Nowadays, it seems that after a few unit tests per awkward section, anything is possible.

…

As you can see, I’m not perfect, but I still very much enjoy day to day coding…

wlgfx@home

My PC at home does actually host a website for testing purpose which you may be interested in seeing. A lot more content will be provided over time.

wlgfx@home Link updated (2017 Jul 31)

This only works when my home PC is on.

Hosting a website from your home PC is possible by using NOIP.com which my Sky router updates each time it is rebooted by sending noip.com my IP address. From there I added a setting on my router which redirects a port to a static IP which my PC is set at.

And that folks, is how I host stuff from my PC.

I only use Apache Tomcat 7, I’m not interested in PHP or SQL.

I’ve also tested out opening a specific port on the router and redirecting to my PC and having a TCP listener. The listener will accept 4 bytes (a command code). If the 4 bytes do not match any valid commands, the connection is closed. Otherwise it will send data back to the client. This project was an interesting test and is not currently running as I do not want to leave open ports on the internet for too long.

New online profile begins here

With the loss of the content from my old website, I am forced to start over again. In one sense that’s a good thing, but there was quite a bit that I really did want to keep.

With an insight into what I want out of my future, I am rebuilding my online profile.

Here, over time, there will be showcase examples of my programming skills as well as topics covering various experiences over the time that I’ve been a programmer. There are two simple examples so far, and I will post the code to that, hopefully, later.

Keep an eye out because I have a lot to write about…

Eclipse IDE

I use the Eclipse IDE quite extensively. For C/C++, Java and more recently web projects. It has it’s faults, but it is damn good.

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