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by RDPUser
Sat Apr 11, 2020 1:12 pm
Forum: Other programming languages
Topic: Reset 1-wire Bus - DS18B20
Replies: 21
Views: 18599

Re: Reset 1-wire Bus - DS18B20

I had the same problem, but only with DS18B20 sensors from China. Most DS18B20 sensors are counterfeit, please check https://github.com/cpetrich/counterfeit_DS18B20 to identify fake sensors. You need an arduino. Didn't mangage to run the code directly on RPI. In fact even a lot of big sellers sell n...
by RDPUser
Sat Apr 11, 2020 8:51 am
Forum: Troubleshooting
Topic: Cross boot compatibility: Boot card from PI4 also in Pi Zero (currently hanging on "Avahi mDNS/DNS-SD Stack"
Replies: 4
Views: 162

Cross boot compatibility: Boot card from PI4 also in Pi Zero (currently hanging on "Avahi mDNS/DNS-SD Stack"

When you download raspbian and flash the card, you can put it in and PI from Zero to Zero 4. How I have a card using in PI4 and I like to use in Pi Zero W. However when booting it hangs at Avahi mDNS/DNS-SD Stack and no further progress is shown. What must be done to make the card bootable in the PI...
by RDPUser
Thu Apr 09, 2020 7:06 pm
Forum: Troubleshooting
Topic: Accessing CIFS mount hangs after target server reboots
Replies: 7
Views: 2523

Re: Accessing CIFS mount hangs after target server reboots

I have the same problem. Server with OpenMediavault on Raspbian crashed while RPi was writing. Now unmount is stuck and the writing process. So the same problem occurs when mounting a share on linux.
by RDPUser
Mon Mar 30, 2020 5:35 pm
Forum: Troubleshooting
Topic: Bug in package bluez 5.50-1.2~deb10u1 massive bluetooth range loss
Replies: 10
Views: 408

Re: Bug in package bluez 5.50-1.2~deb10u1 massive bluetooth range loss

There were a couple of days when the Bluez update from upstream was not compatible with our stuff, this should now be fixed. Please apt update/apt full-upgrade to check if the problem is still present. UnatendedUpgrades downloaded the bad version on most of my Raspberry Pis. Will it also fix it now...
by RDPUser
Sat Mar 28, 2020 10:26 pm
Forum: Troubleshooting
Topic: Bug in package bluez 5.50-1.2~deb10u1 massive bluetooth range loss
Replies: 10
Views: 408

Re: Bug in package bluez 5.50-1.2~deb10u1 massive bluetooth range loss

@RPi-Team: So many problems in such short time. Can somebody take a closer look? I'd write a PM to get faster in contact, but this feature has been disabled du to some strange regulations...
by RDPUser
Fri Mar 27, 2020 4:55 pm
Forum: Troubleshooting
Topic: Bug in package bluez 5.50-1.2~deb10u1 massive bluetooth range loss
Replies: 10
Views: 408

Bug in package bluez 5.50-1.2~deb10u1 massive bluetooth range loss

I've discovered a very strange issue. I use Xiamoi Aqara Bluetooth sensors to read out temperature values. The are about 15 Meters away, through 2 massive stone walls. With raspberry PI ZeroW no problem. Today I've upgraded via apt update und apt ugprade (I'm on buster). After that all sensors weren...
by RDPUser
Sat Feb 22, 2020 11:05 pm
Forum: Advanced users
Topic: Warning don't install 'cpufrequtils' when overlocking
Replies: 1
Views: 227

Re: Warning don't install 'cpufrequtils' when overlocking

Very strange. After uninstalling cpufrequtils openmediavault didn't work anymore. Thus I've setup a new buster (latest Februar release, as also before) and now 2000 MHz works. Very strange. I've made overclocking experiments with another image and there it ran stable with 2000 MHz and overvoltage of...
by RDPUser
Sat Feb 22, 2020 10:18 pm
Forum: Advanced users
Topic: Warning don't install 'cpufrequtils' when overlocking
Replies: 1
Views: 227

Warning don't install 'cpufrequtils' when overlocking

I've installed openmediavault on a RPI 4 and wanted to overclock with arm_freq=2000 over_voltage=4 but after that maximum CPU frequency was 1333 MHz and performance was reduced of course. I knew it worked because on a fresh buster lite it worked. Strange thing was arm_freq=2147 over_voltage=6 worked...
by RDPUser
Sun Jan 26, 2020 5:06 pm
Forum: Advanced users
Topic: [Tutorial] Encrypt Raspberry-PI on Debian Buster with remote unlock
Replies: 10
Views: 5111

Re: [Tutorial] Encrypt Raspberry-PI on Debian Buster with remote unlock

Could be possible, but what you plan to do gives fake security.
Key space of serial is too limited to provide security. You could see the unlock code retriving the serial number. Sorry, I can't support you implementing unsecure encryption.
by RDPUser
Mon Dec 30, 2019 1:56 am
Forum: Troubleshooting
Topic: Raspberry PI4 very short Bluetooth range, increasing trasmit power?
Replies: 2
Views: 484

Raspberry PI4 very short Bluetooth range, increasing trasmit power?

I have a PI 4 and a PI Zero W. Sending Bluetooth packets with the PI 4 I've noticed quite a short range. So I've made a test between a RPI 4 and a Zero W. Each sending bluetooth Pakets and measuring the received signal strength. I know the signal strength may be calculated differently on both device...
by RDPUser
Sun Dec 29, 2019 11:46 am
Forum: Troubleshooting
Topic: PI Zero W: SSH Login hangs after password [solved]
Replies: 0
Views: 121

PI Zero W: SSH Login hangs after password [solved]

I have a PI Zero W, last update was from Juli 2019. A few days ago I did apt update and apt upgrade and rebootet. I've logged in and everyting seemed to work fine. Now today I wanted to connect again. I instantly get the login prompt via putty. But after entering the password it hangs. Sometimes I s...
by RDPUser
Sun Aug 25, 2019 9:07 pm
Forum: Advanced users
Topic: [Tutorial] Hardening/Securing RPi against cold boot attacks
Replies: 11
Views: 2047

Re: [Tutorial] Hardening/Securing RPi against cold boot attacks

@scruss
You can use the method explained here https://www.raspberrypi.org/forums/view ... 9&t=246996
Just do this in an initramfs with as little as running possible to recover most of the memory. Of course you also could compile your own kernel with a smaller memory footprint.
by RDPUser
Sun Aug 25, 2019 9:03 pm
Forum: Advanced users
Topic: [Tutorial] Encrypt Raspberry-PI on Debian Buster with remote unlock
Replies: 10
Views: 5111

Re: [Tutorial] Encrypt Raspberry-PI on Debian Buster with remote unlock

@asimiklit Thank you very much for explaining how to use password authentikcation with dropbear. One more point with luks 2. I received an error while I was trying to mount it: Did you create it on another machine with more memory? The linked article says that this happends when the other machine ha...
by RDPUser
Wed Aug 07, 2019 1:06 am
Forum: Advanced users
Topic: [Tutorial] Encrypt Raspberry-PI on Debian Buster with remote unlock
Replies: 10
Views: 5111

[Tutorial] Encrypt Raspberry-PI on Debian Buster with remote unlock

Warning: Make backup before you try this with your system. I suggest beginning with a fresh installation of Raspian Buster. These commands suppose you have cryptsetupv2. This comes with Buster only. So update to Buster before when you try to encrypt on old system. You need an external USB storage m...
by RDPUser
Mon Aug 05, 2019 9:44 am
Forum: Advanced users
Topic: [Tutorial] Hardening/Securing RPi against cold boot attacks
Replies: 11
Views: 2047

[Tutorial] Hardening/Securing RPi against cold boot attacks

Perhaps you remember, that we discussed there https://www.raspberrypi.org/forums/viewtopic.php?t=231085 whether Raspberry-PI is cold boot protected. There was a link to this thread https://www.raspberrypi.org/forums/viewtopic.php?t=199047 where it was proof that RAM content remains even after a shor...
by RDPUser
Fri Aug 02, 2019 12:21 am
Forum: Troubleshooting
Topic: Samba on Raspi copy large files gives error 0x8007003B solution so far: don't use ExFAT or FAT32
Replies: 11
Views: 3877

Re: Samba on Raspi copy large files gives error 0x8007003B solution so far: don't use ExFAT or FAT32

Update: As the ntfs-3g driver has very poor performance, I suggest to use ext4 as filesystem. You can read the files within windows with Linux-Reader (Freeware) https://www.diskinternals.com/linux-reader/ If you need "live acces" there is a solution from paragon, 10 days free, after that, still free...
by RDPUser
Thu Aug 01, 2019 12:38 am
Forum: Advanced users
Topic: Adding second static IP address
Replies: 1
Views: 658

Re: Adding second static IP address

Found the solution with help of this post https://www.raspberrypi.org/forums/viewtopic.php?t=191678 Hope this answer is helpful for all others. Just create /etc/network/interfaces.d/eth0_0 with this content and everything will work fine. Strange behaviour since /etc/network/interfaces explicitly inc...
by RDPUser
Thu Aug 01, 2019 12:29 am
Forum: Advanced users
Topic: Adding second static IP address
Replies: 1
Views: 658

Adding second static IP address

How can a second static ip address be configured on buster? I've tried sudo cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Please note that this file is written to be used with dhcpcd # For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf' # Include files fr...
by RDPUser
Sun Jul 28, 2019 7:58 am
Forum: Advanced users
Topic: Raspberry PI4 cold boot protected. By design?
Replies: 4
Views: 755

Re: Raspberry PI4 cold boot protected. By design?

I am not sure what you are asking here, or what you refer to when asking if it is by design or by accident; zeroing or not zeroing ? Sorry for misunderstanding. I wanted to know if the RAM content is just gone because of the short poweroutage of the RAM chip or is there code that clears the RAM. Bu...
by RDPUser
Sat Jul 27, 2019 8:51 am
Forum: Advanced users
Topic: Raspberry PI4 cold boot protected. By design?
Replies: 4
Views: 755

Raspberry PI4 cold boot protected. By design?

Perhaps you remember, that we discussed there https://www.raspberrypi.org/forums/viewtopic.php?t=231085 whether Raspberry-PI is cold boot protected. There was a link to this thread https://www.raspberrypi.org/forums/viewtopic.php?t=199047 where it was proof that RAM content remains even after a shor...
by RDPUser
Sat Jul 20, 2019 1:18 pm
Forum: Device Tree
Topic: Using ramoops/pstore to capture kernel panics
Replies: 2
Views: 7239

Re: Using ramoops/pstore to capture kernel panics

Hi notro,

can you explain what you to with the dt-Overlay? I'm not firm with this. Do you have to compile it? If so, how? And then? Put it to /boot?
by RDPUser
Fri Jul 19, 2019 8:05 am
Forum: Advanced users
Topic: tune2fs Last write time 5 month in the past, any change to refresh values?
Replies: 7
Views: 920

Re: tune2fs Last write time 5 month in the past, any change to refresh values?

rpdom wrote:
Wed Jul 17, 2019 7:13 am
trejan said to unmount it by rebooting. Not unmount it while it is running.
Yeah I know. And as I said, sometimes poweroutages happen and thus the writecount is lost. Thats why I asked for a possibility to update without rebooting.
by RDPUser
Wed Jul 17, 2019 5:52 am
Forum: Troubleshooting
Topic: [Solved] USB HDD resets on Pi Zero W
Replies: 8
Views: 675

Re: USB HDD resets on Pi Zero W

I've changed the USB-Cable from PSU to RPi Zero W and now no resets occur anymore. So it was a power issue. So note RPi Zero W doesn't record (any?) undervoltages with vcgencmd get_throttled in this case.
by RDPUser
Wed Jul 17, 2019 5:49 am
Forum: Advanced users
Topic: tune2fs Last write time 5 month in the past, any change to refresh values?
Replies: 7
Views: 920

Re: tune2fs Last write time 5 month in the past, any change to refresh values?

Unmounting rootfs is probably not a good idea :)
Is there a way to update it without unmouting? In case of a poweroutage writtenbyte count would be lost.

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