SkillsC, Java, Python; Hardware & Embedded stuff
Joined devRant on 1/23/2019
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The moment you realize the .net Framework's String.TrimEnd() method will actually modify your String prior to returning it, and there seems to be no convenient way of getting a copy without declaring a new variable...
Just wanted to get rid of excess empty lines in the log caused by trailing <CR><LF> when receiving lines of serial data:
Console.WriteLine(DateTime.Now.ToString("H:m:s.fff") + " - serial data received on " + com_port + ": " + serial_data.TrimEnd())
But suddenly the parser could not find its termination characters anymore...
Resulting in probably the most disgusting parentheses I had ever added to any code:
Console.WriteLine(DateTime.Now.ToString("H:m:s.fff") + " - serial data received on " + com_port + (": " + serial_data).TrimEnd())
Yes, I feel bad about it, but then again is VB .net and it kinda "works for me". I promise I will (try to remember to) remove these as soon as debugging is done...4
It all started with an undelivereable e-mail.
New manager (soon-to-be boss) walks into admin guy's office and complains about an e-mail he sent to a customer being rejected by the recipient's mail server. I can hear parts of the conversation from my office across the floor.
Recipient uses the spamcop.net blacklist and our mail was rejected since it came from an IP address known to be sending mails to their spamtrap.
Admin guy wants to verify the claim by trying to find out our static public IPv4 address, to compare it to the blacklisted one from the notification.
For half an hour boss and him are trying to find the correct login credentials for the telco's customer-self-care web interface.
Eventually they call telco's support to get new credentials, it turned out during the VoIP migration about six months ago we got new credentials that were apparently not noted anywhere.
Eventually admin guy can log in, and wonders why he can't see any static IP address listed there, calls support again. Turns out we were not even using a static IP address anymore since the VoIP change. Now it's not like we would be hosting any services that need to be publicly accessible, nor would all users send their e-mail via a local server (at least my machine is already configured to talk directly to the telco's smtp, but this was supposedly different in the good ol' days, so I'm not sure whether it still applies to some users).
In any case, the e-mail issue seems completely forgotten by now: Admin guy wants his static ip address back, negotiates with telco support.
The change will require new PPPoE credentials for the VDSL line, he apparently received them over the phone(?) and should update them in the CPE after they had disabled the login for the dynamic address. Obviously something went wrong, admin guy meanwhile having to use his private phone to call support, claims the credentials would be reverted immediately when he changed them in the CPE Web UI.
Now I'm not exactly sure why, there's two scenarios I could imagine:
- Maybe telco would use TR-069/CWMP to remotely provision the credentials which are not updated in their system, thus overwriting CPE to the old ones and don't allow for manual changes, or
- Maybe just a browser issue. The CPE's login page is not even rendered correctly in my browser, but then again I'm the only one at the company using Firefox Private Mode with Ghostery, so it can't be reproduced on another machine. At least viewing the login/status page works with IE11 though, no idea how badly-written the config stuff itself might be.
Many hours pass, I enjoy not being annoyed by incoming phone calls for the rest of the day. Boss is slightly less happy, no internet and no incoming calls.
Next morning, windows would ask me to classify this new network as public/work/private - apparently someone tried factory-resetting the CPE. Or did they even get a replacement!? Still no internet though.
Hours later, everything finally back to normal, no idea what exactly happened - but we have our old static IPv4 address back, still wondering what we need it for.
Oh, and the blacklisted IP address was just the telco's mail server, of course. They end up on the spamcop list every once in a while.
tl;dr: if you're running a business in Germany that needs e-mail, just don't send it via the big magenta monopoly - you would end up sharing the same mail servers with tons of small businesses that might not employ the most qualified people for securing their stuff, so they will naturally be pwned and abused for spam every once in a while, having your mailservers blacklisted.
I'm waiting for the day when the next e-mail will be blocked and manager / boss eventually wonder how the 24-hours-outage did not even fix aynything in the end...
Customer requested the implementation of a "Master PIN" Code for accessing their appliances, to be used by field technicians when the users forgot their PIN.
Actually they could also read or reset it via USB using the config utility, but then again it's much more convenient not having to carry a laptop all the time...
Our only contact person at that company - the guy we got all the requirements from, let's call him Mr. L - wouldn't talk only positive about the company and managers, but we never worried as the project was making good progress.
In the final phase of the project, Mr. L was often hard to reach, always seemed to be busy even when we just needed a prototype approved to start production.
He always claimed to be waiting for approval from his supervisors and engineers, still discussing minor things with them.
When he left the company about three months later, it turned out he was pretty much the only person knowing about the details of the project, and his successor would start asking us very basic questions about the appliance,
wondering why we had implemented certain things the way they were.
(Well, how about we implemented everything just as requested by a former co-worker of yours?!)
Somewhere in the preliminary specs previously exchanged with Mr. L, there is even a hint of a "Master PIN", but the value is never specified anywhere on paper.
Today, we are not sure if anyone except for him even knew about it.
Maybe we should ask them whether they are now selling a product that has a 4-digit backdoor PIN nobody at the company is aware of?
Obviously, it is the birth year of Mr. L.2
Company is about to get certified to ISO 9001:
Kick-off meeting with consultant announced weeks ago, mandatory for all employees.
Everyone is kind of joking about it, but also looking forward to certain workflows maybe changing to the better.
Two hours before meeting, told by CTO not to attend.
Some code I hadn't touched for half a year needs urgent patching to make the equipment pass EMC test (doing so within a few hours would help us save the lab cost for another day of testing).
When they applied RF noise to the bus lines, the CAN peripheral would glitch and need reset, this should happen covertly the first few times without raising any error to the user, so they could just finish the testing without being disturbed by the error - and the EMC lab will not test the functionality of the device after all.
The irony when you were actually supposed to learn about quality that day...