I was working in a manufacturing facility where I had hundreds of industrial computers and printers that were between 0 and 20 years old. They were running on their own clean network so that someone has to be in the manufacturing network to access them. The boss announced that the executives will be pushing a “zero trust” security model because they need IoT devices. I told him “A computer running Windows 98 can’t be on the same VLAN as office computers. We can’t harden most of the systems or patch the vulnerabilities. We also can’t reprogram all of the devices to communicate using TLS or encrypt communications.“ Executives got offended that I would even question the decision and be so vocal about it. They hired a team to remove the network hardware and told me that I was overreacting. All of our system support was contracted to India so I was going to be the on-site support person.

They moved all the manufacturing devices to the office network. Then the attacks started. Printers dumped thousands of pages of memes. Ransomware shut down manufacturing computers. Our central database had someone change a serial number for a product to “hello world” and that device got shipped to a customer. SharePoint was attacked in many many ways. VNC servers were running on most computers and occasionally I would see someone remotely poking around and I knew it wasn’t from our team because we were all there.

I bought a case of cheap consumer routers and used them in manufacturing cells to block port traffic. I used Kali on an old computer to scan and patch network vulnerabilities daily.

The worst part was executives didn’t “believe” that there were security incidents. You don’t believe in what you don’t understand right?

After 8 months of responding to security incident after security incident I quit to avoid burning out. This is a company that manufactures and sells devices to big companies like apple and google to install in their network. This isn’t an insignificant company. Security negligence on a level I get angry thinking about.

Just talked to a guy who codes microcontrolers in assembler. He wants to use a raspberry pi as an interface device between TCP and Serial port. He asked me how fast that would run over internet and I told him that it depends on the connection an other things it takes at least some milli secs to transmit.
He is like:
What the fuck do you mean milli secs?
I poll data on my 20 mhz controler every like micro sec or so and that Pi got 1Ghz.

Me like: Yea go fucking code that shit on your own with ASM.

!rant
I'm developing an OS. I tried running it on the laptop that's on the ground. Everything works fine except text mode. There is no output when running it in text mode(not the high resolution one shown on image). Since the OS sends all data that is printed to the first serial port I might as well read the output from the serial ports. Since the laptop I use for development doesn't have any serial ports I had to use the older Windows 98 PC. For unknown reasons I could not get any output from the serial ports so I gave up.
tl;dr I wasted some time trying to debug my OS.
Image of my debugging setup(taken with the latest potato).

I had two teachers in school, who even after finishing the class, continued to program with interested students. For example programming a robot or communicating over the serial port of a computer using Java.

*packing for a school-hosted graduation celebration with friends*
let's see, first rule of packing for a trip, count on every slim chance happening...

List of things now in backpack:
3 changes of clothes (1-night trip for an all night party in <100-MILE-AWAY MAJOR CITY>)
Laptop
3DS
3x 4-port USB Hubs
10-port power strip (not fully in bag, but mostly so.)
Extra pair of shoes
3.5" external floppy drive
First aid kit
SAK
precision driver set
soldering set
multitool
pliers (1x farmer's, 1x bent needlenose)
multimeter
empty laptop HDD (250GB)
magnet in Altoids tin (can't have it trashing the HDD!)
VGA to RGB (Composite ends) adapter
Composite/S-VIDEO USB capture card
Portable USB chargers (1x 30k mAh 2-port, 1x superslim 3k mAh 1-port)
Enough phone chargers to replace all chargers within 30 miles
Smelling salts
2x 16GB thumbdrives
Boot disc set
$200
School IDs (for bag's ID slot)
3 pairs of decent earbuds (no el cheapo $1 ones because they break trying to get them out of the package)
Serial to USB adapter
Rehydration salts
Magnesium fire striker
Plenty of pens and pencils
Emergency radio locator beacon
Emergency cellular locator beacon
SD/eMMC/CF/TF/MCP(D) USB reader
external HDD reader (2.5" IDE/3.5" IDE/SATA, external power)

am i missing anything?

The fastest way to a woman’s heart is through her serial port. 😁😁😁

Last completed (so not something which is still going on) project i have learned a lot was for "digital- and microcontroller technology" classes.
I designed a tower which fits on a pc fan. In this tower there is a tabletennis ball and on top of it is a infrared sensor. With a Potentiometer you can set the height at which the ball shall float.
As microcontroller i took an arduino uno. For visualization i used SerialComInstruments.
Learned lots of microcontroller programming, pid controls and how the fuck a serial port communication really works.

Frustration Rant!

Because old hardware means learning the hard way sometimes, I've had to purchase more goodies.

On my last update, I installed the rs232 shield which may have inadvertently been wired backwards for Tx/Rx from what im used to. I assume it is backwards to most db9 serial ports because most Arduino or other projects you would do with a pi have serial "in" connections like old routers and devices that would be "controlled" rather than the other way around. Anyway, according to a video on youtube showing a guy turning an old machine into an IRC client via raspberry pi, this shield may be swapped. That means that instead of interfacing with the old machine via a null modem crossover cable, I need a straight cable with male db9 on both ends. I unfortunately tried using the null modem crossover cable which was reversing the reversed pins all over again. I hope these next few days are more fruitful now that I've bought a straight cable and db9/25 adapter.

The good thing is that I managed to get the pi to recognize its new serial port. I also dusted off my DOS skills and my serial card in the 5150 seems to work.

I literally banged my head after nothing worked. Im hoping that the tx/ Rx is solved soon.

Oh and that AT to PS/2 adapter will allow me to use by IBM original Model M Keyboarf rather than the fun model F.

I remember learning VB for the first time and then using it to write a software to control a robot via a serial port. I couldn't debug few errors! So I changed the message text in the alert boxes to things like - 'Please press OK to let robot know that you're ready.' 'Robot is thinking. OK to continue'. 😂😆 And my friends still loved me!

PROBLEM:
We need to log out phone calls in and outlet of the company

How we wanted to do it:
Use node.js to read the serial port from the phone system then store the data into the MsSQL database

Eventual solution:
1) Read serial port
2) store in local MySQL database
3) every 3 minutes create a CSV file containing the last 3 minutes of calls and store on a Windows shared directory
4) have a access 2000 programme collect these files every 30 minutes
5) insert into MsSQL database

Talking to a vendor in China to source some hardware modules. The engineers don't speak any English, and the sales rep doesn't know a serial port from a monkey's ass. Shortest game of Chinese whispers 😥

due to some error on GCP, my and friend got locked out of a prod server over ssh.

And the fucking admin was not giving us privileges to do it through serial port, why you ask cause submitting keys from dashboard was not working.

Later, found out google runs a startup script from startup-script metadata tag.

It felt like showing a middle finger to the admin and google

More network/hardware than dev but anyway: I use OPNsense as a firewall at home on an embedded system. Had everything set up nicely and appearing to be working fine, quite a lot of things set up (static leases, VLANs with various firewall rules etc. - a fair bit of stuff involved). I noticed my remote system was failing to back up to my local one. Turned out port forwarding wasn't fully working (initial packet got through but nothing else). I noticed this at midnight.

Ran an update to see if that helped - nope. Reboot time then! It made its shutdown noises and I waited 15 minutes before giving up (no noises, no ping response). Took SD card out. Copied a fresh install onto it, thus wiping all settings. Booted up fine, set up my internet connection, all good. Proceeded to configure it. Noticed I couldn't access the internet from my PC, but could from the firewall itself. Rebooted the firewall. It didn't come back up. Argh!

Reinstalled AGAIN. Attached a serial cable and it was complaining about something which sounded like it couldn't read the SD card. Tried another. Nope. Looked online (using phone): known issue to do with boot delays.

Gave up and went to bed at this point (4am).

Next day: Installed it in a VM instead. Still no internet from my PC! Another known issue to do with default gateway not being the PPPoE interface. Got into shell, manually changed the default route. Was then able to update to the latest version which fixes the gateway issue. Rebooted the VM. All good.

Put all my settings back in, this time taking a backup afterward.

Only to discover....

....port forwarding wasn't working properly. Back to square 1.

Poked around with some NAT settings (outbound ones), made no difference, undid those changes and suddenly it started working.

WTF? /waves arms in the air

OPNsense folk were very helpful, producing a new build for me to try within a couple of hours of me asking about the problem.

But days like that, I start to question whether I really enjoy technology as much as I thought I did...

Is there any good linux application to send FUCKING RAW data to a serial port?

Port in question: /dev/ttyACM0
Baud (nice if configurable): 9600

I want to send specific binary data. I want to send 0b00110011 or something like that to it, not some character or a hex value.

Well, my first project was to replicate something I saw somewhere: connect a pen to a potentiometer and to the serial port of an Apple II in such a way that you could replicate the movement of the pen on screen and also draw.

Apple II . Mouse, touch screens, tablet, etc didn't exist.
It worked.

However, a part from feeling old, I feel also stupid now, because I didn't understand at all the potentiality of such a tool nor what was going to happen in few years.

I could have invented a mouse. Or the concept of GUI. It was just in front of me.

Instead, I think I just draw some tits an some dick.

So I'm here.
Wondering, what is there now in front of my eyes, that I don't see?

So weird stuff is I can't make my modem make a call (ATD command). It keeps saying no carrier. Wtf!