'illegal instruction' on raspberry pi 0w while installing cloudflared

Adding `raspberry pi zero w` as tunnel to cloudflared zero trust

Considering the fact that you have installed Debian on `raspberry pi 0w`,
While setting up cloudflared tunnel on `raspberry pi 0w` we get following error

illegal instruction

workaround for fixing this issue:

Groundwork before execution

1. First we make sources.list modifyable

  
chmod 777 /etc/apt/sources.list

2. Add following entry in sources.list

deb [arch=arm signed-by=/usr/share/keyrings/cloudflare-main.gpg] https://pkg.cloudflare.com/cloudflared buster main

3. Add arm architecture to the system

dpkg --add-architecture arm

The execution

4. Install ARM version of cloudflared on your `raspberry pi 0w` as shown in above screenshot

curl -L --output cloudflared.deb https://github.com/cloudflare/cloudflared/releases/latest/download/cloudflared-linux-arm.deb
sudo dpkg -i cloudflared.deb
sudo cloudflared service install <connector-token>

Whenever two people talk, there are seven opinions

When two people talk, there are seven opinions

- P1's opinion about P2
- P2's opinion about P1
- T's opinion about P1
- T's opinion about P2
- P1's own opinion about himself
- P2's own opinion about himself
- T's opinion about both P1 & P2

PS: P1 & P2 are the two people and T is third person

Busyness contributes to happiness

Researchers found that those who'd spent 15 minutes walking ended up significantly happier than those who’d spent 15 minutes waiting.
Busyness contributes to happiness even when you think you’d prefer to be idle.
A recent study has suggested that there really is such a thing as too much free time
– and that our subjective well being actually begins to drop if we have more than five hours of it in a day.
As a dev if you feel I dont know what to do, you don't even realize that idleness is killing your mental state & making you unhappy

Conclusion

To recap, the universe has been fundamentally altered by this revelation.
So dont stay idle for longer time,
Dont stay longer in dark places for longer time
Avoid procrastination
Otherwise your happiness will drop to 0

Linux is the underdog that's gonna steal the show

Nowdays Linux can be easily installed on
1. Windows -> WSL
2. Android Mobile -> Termux, proot-distro
3. Cloud -> Google cloud shell
4. VM -> virtualbox

Too much procrastination because idleness?? dont want to choose either options??
Go investigate the mysterious device lurking in the corner,
hint: it has blinking lights, and check if it supports OpenWrt and install it.

Most devs will go to random OTT/YT or keep on scrolling those shorts/reels
that is also killing your mental state & you dont even realize it is continuously disturbing you.
Technology is saving you from profound levels of boredom and its a problem
devs should keep themselves idle for sometime but no longer than 5 hours,
software development is 80% thinking and 20% summoning those digital spirits with your keyboard prowess

Don't keep yourself busy watching that ott or listening to that music
Just do nothing for sometime, just breathe, live in present,
understand your surrounding in detailed manner,
After sometime your mind will be filled with void
Let it happen, dont label it as boredom.


after random interval your mind will wakeup from deep sleep state and you will feel productive
and when you are at that state you can do the impossible. go do that impossible thing now!


PS: The author is not a software engineer, he is computer scientist

own home-lab on-premise micro cloud on Android

Aim

At the end of this article you will be running your own small scale on-premise cloud on Android

Requirements

1. Android device
2. Cloudflare account
3. Domain name
4. Knowledge of Linux (optional)

TLDR;

1. Install termux on your Android device
2. Create Cloudflare account
3. Get your domain name and point nameservers to Cloudflare
4. Install any proot-distro on Android using Termux
5. Point domain to your Linux using Cloudflare zero trust

The Method

--TODO--

Conclusion

Unlimited possibilities when you run linux on your mobile phone and point cloud to your linux running on mobile

Recommended Hardware

--TODO--

References

--TODO--

Mobile first css media queries

Mobile first css media queries to adjust UI controls for various resolutions:

@media (min-width:320px) { /* smartphones, portrait iPhone, portrait 480x320 phones (Android) */ }
@media (min-width:480px) { /* smartphones, Android phones, landscape iPhone */ }
@media (min-width:600px) { /* portrait tablets, portrait iPad, e-readers (Nook/Kindle), landscape 800x480 phones (Android) */ }
@media (min-width:801px) { /* tablet, landscape iPad, lo-res laptops ands desktops */ }
@media (min-width:1025px) { /* big landscape tablets, laptops, and desktops */ }
@media (min-width:1281px) { /* hi-res laptops and desktops */ }

Installing .NET on Android

This runs .NET natively
not in a vm
not in a container
no need to have root access or jailbreaking your android
.NET runs natively on android in user space

Install Termux apk on android

pkg install proot
pkg install proot-distro

proot-distro allows to install linux which runs along with android os. This is not a vm so we get native performance.

proot-distro commands:

    proot-distro list - show the supported distributions and their status.
    proot-distro install - install a distribution.
    proot-distro login - start a root shell for the distribution.
    proot-distro remove - uninstall the distribution.
    proot-distro reset - reinstall the distribution.

Following linux flavours are supported:

1. Alpine Linux (edge)
2. Arch Linux / Arch Linux 32 / Arch Linux ARM
3. Debian (stable)
4. Fedora 35
5. Manjaro AArch64
6. OpenSUSE (Tumbleweed)
7. Ubuntu (22.04)
8. Void Linux

Following are the steps for Ubuntu

proot-distro install ubuntu
proot-distro login ubuntu  --termux-home 
su
apt install wget -y
apt install ssh -y
apt-get install -y net-tools

Manual installation of .NET: https://learn.microsoft.com/en-us/dotnet/core/install/linux-scripted-manual#scripted-install

wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh

cd ~/.dotnet
echo 'export DOTNET_ROOT=$HOME/.dotnet' >> ~/.bashrc
echo 'export PATH=$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools' >> ~/.bashrc
source ~/.bashrc

Now the dotnet CLI can be used, more on this: https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet

--REMOTE TERMUX--
https://gist.github.com/mjnaderi/b933fe940cd47b09d5cfc14875e77d67
https://glow.li/posts/run-an-ssh-server-on-your-android-with-termux/
Detailed video coming soon

Applications:
1. You can install cloudflared (Cloudflare zero trust) and then can host asp.net site on your android device
2. Run FTP server
3. Share the files without uploading anywhere

Amplifieing analog audio output from 3.5mm audio jack with PAM8403 amplifier

Aim

In this post we will develop an amplifier which amplifies 3.5mm analog audio output, You can use the circuit as a speaker for PC.

Introduction

Required Electronic Components:
1. PAM8403 Class D 3W amplifier
2. 3.3V 5.5V FT232RL FTDI USB to TTL Serial Adapter Module
3. 5V 3A USB power supply
4. USB Cable, A-Male to Mini-B Cord USB cable
5. 3W Speaker
6. Jumper Wires
7. AUX Cable

Detailed video here: https://youtu.be/CaUC_d9g3oc

C#: Convert any time to time in any timezone

You can use this to convert any server time to india time or any other time zone
here's possible list of all zone IDs which can be used in this method: https://nodatime.org/TimeZones

First add reference to NodaTime nuget package which is built by the ultimate Jon Skeet

Pun intended

/*
1. Jon Skeet can divide by zero.
2. When Jon Skeet's code fails to compile the compiler apologises.
3. If Jon-Skeet's program fails to compile they fix the compiler.
4. Jon Skeet coded his last project entirely in Microsoft Paint, just for the challenge.
5. Jon Skeet keeps a daily backup of the Internet on his USB pendrive.
*/

Jon Skeet handles all my exceptions

try
{
    insert.code.here();
}
catch(Exception ex)
{
  JonSkeet(ex);
}

here's the method

public DateTime ConvertToTimeZoneFromUtc(DateTime utcDateTime, string timezone)
{
    var easternTimeZone = DateTimeZoneProviders.Tzdb[timezone];
    return Instant.FromDateTimeUtc(utcDateTime)
                    .InZone(easternTimeZone)
                    .ToDateTimeUnspecified();
}

usage:

string zoneID = "Asia/Kolkata";
var date = ConvertToTimeZoneFromUtc(DateTime.Now.ToUniversalTime(), zoneID);

SkeetOverflow link: https://stackoverflow.com/questions/75580559/hot-to-change-the-default-datetime-date-of-app-hosted-on-cloud-server-side-to-m/75581290

Many times, we store dates in our database by passing DateTime as a parameter value or by using GETDATE() in SQL Server. In both the cases, the time of the current machine is passed as the value. It is OK in case of Desktop applications however, when we move to Web applications, the current computer is the server where the website/app is hosted. This means if you’re in India and the website is hosted in a server in the US, the time stored in the database will be US time and not your local time. The correct way is to store the time in the local timezone. In this post we will see how to convert a DateTime object into specific TimeZone in C#. To do this, we will use the FindSystemTimeZoneById() of TimeZoneInfo class. This function takes Id as a parameter to return the equivalent time in timezone passed. In the example below, we are taking the current system time and converting it into “Central Standard Time”. DateTime currentTime = TimeZoneInfo.ConvertTime(DateTime.Now, TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time")); Let me know via comments if you are aware of about other ways to perform this action.