Raspberry Pi Forums

davef

That did it, thanks.

davef

Re-writing some Bash scripts in Python, the following Bash script: echo "test" >> /dev/tty1 displays on the console when run manually in /home AND when the Bash script is called by sudo crontab. However, if I use this Python script: #!/usr/bin/python3 import sys sys.stdout.write("test...

davef

JumpZero, Thanks for posting this. I was doing another stuff at 00:00 and after the logrotate the system either unsuccessfully didn't make a WiFi connection or stopped doing my main cron job. Tried to find where one could change the time unsuccessfully, so followed the suggestion of moving /etc/cron...

davef

I can't see how it is the Pi either, but was hoping that someone here may have experienced a similar problem.

Cheers,
Dave

davef

I run a Pi with a Huawei E8231 3g dongle. Once a day, at a specific time I connect to the internet, send a100KB data file and then disconnect. It will go for weeks using about 100kB a day on a 500MB/month data plan. Then one day 500MB of data disappears during the 24 hour off-internet period. Lookin...

davef

RaTTus, I am guessing you mean sudo service cron status With the system running normally this is what I get: ● cron.service - Regular background program processing daemon Loaded: loaded (/lib/systemd/system/cron.service; enabled) Active: active (running) since Sun 2019-09-22 15:18:27 NZST; 5 days ag...

davef

As I have never heard of systemd-cron Google led me to this HowTo: https://www.putorius.net/using-systemd-timers.html What I couldn't determine was why using systemd-timers might be better in my situation. Is it more robust? Also, I would need to work out how to stop multiple instances of this timer...

davef

Thank you for the suggestions ... will have to wait until the weekend as the devices are at a remote location. I recall looking into syslog and still see that cron apparently runs every minute, but the bash script that cron calls does not get executed. Perhaps should mention that cron is a one line ...

davef

I run a cron job every minute. As I have two Model 3B+ and only one HDMI monitor I have noticed that when I swap the monitor and/or USB keyboard between units that the Pi running Jessie sometimes stops running. Maybe, 1 in 10 swap-overs. sudo service --status-all shows a [+] against cron but it just...

davef

I am NOT about to bin ALL the work I have done getting to this stage. The only logical conclusion to your brief statement, that I can see, is that maybe Stretch has to go and I revert to Jessie on both units. However, I am quite keen to figure out what is actually not working on the Stretch install....

davef

I have two Pi B+, one running Jessie and the other Stretch. They both have 3G USB dongles attached which I use for remote data collection. Once a day I bring up an internet connection, send 50-100KB worth of data and then take down the internet connection. The unit running Jessie has worked well for...

davef

I use the ADS1115 and one thing I had to do was keep the I2C lines quite short, ie 25-50mm. Also, the ADSD1115 breakout board I used had some pull-up resistors, which I had to remove. Just to clarify 31,345V - 32,542 V, 31456 V, 32,567 I assume you mean: 31.345V, 32.542 V, 31456 V, 32.567, ie no min...

davef

If I recall correctly, doing this years ago, that in /sys/bus/i2c/devices/i2c-1/new_device or /sys/bus/i2c/devices/i2c-1/ there should be a list of parameters that you are allowed to change. Again, I think something like echo some number to that location How you might add new ones I never tried.

davef

I get <502 Bad Gateway> when I try to look at the file.

davef

Don't know if this will be of much help, but I see similarities with a problem I was having. https://www.raspberrypi.org/forums/viewtopic.php?f=36&t=229968&p=1413254&hilit=static+dhcpcd#p1413254 Are you using Stretch or Jessie? Since I got rid of dchpcd and using a static interface on on...

davef

I would suggest going to https://community.hologram.io/ and searching through their forum. Many guys there seem to use at AT commands to talk to their modems, IE Huawei E3531 etc. I just use one of their Python scripts.

Good luck,
Dave

davef

Maybe this helps:
https://www.raspberrypi.org/forums/view ... hp?t=49283

davef

Thanks Dougie. Looks like after the last session of removing dhcpcd5/dhcpcd I didn't reboot.

Now, all that remains is:

Code: Select all

./etc/systemd/system/dhcpcd.service.d/wait.conf
./etc/dhcpcd.secret
./etc/dhcpcd.duid

and it doesn't run. Gr8

Dave

davef

I will try that and report back in about a week. The Pi is in a remote location.

Thanks,
Dave

davef

Pretty sure I rebooted several times, but will try again.

Thanks,
Dave

davef

Even though I have done a: sudo apt-get purge dhcpcd I still get a lot of dhcpcd-related entries in syslog. Doing a : sudo find -name dhcpcd* -print The following files still remain: ./etc/systemd/system/dhcpcd.service.d/wait.conf ./etc/dhcpcd.secret ./etc/dhcpcd.duid ./run/dhcpcd ./run/dhcpcd.unpri...

davef

bzt, Had a look at "sysctl -a" and thought I don't want to mess around at this level. The suggestion of using "watch 1 ip addr sh" ... at the moment I don't know how to run the 2nd terminal on my hardware. I hope it would give similar clues as looking at syslog. epoch1970, Using ...

davef

Thanks both for further suggestions. I will digest the comments, there is quite a bit of new content in them that I have to get my head around. Progress after the dhcpcd.conf timeout to 1 second suggestion by epoch 1970: Changed timeout in dhcpcd.conf to 1 second. All I can tell at this stage is tha...

davef

Hi epoch 1970, 1) Jessie latest upgrades applied 2) Yes 3) Yes 4) Yes, that is my understanding 5) I guess so, I am not confident how this part works. I won't be back at the remote site for a few days to try your suggestion, regarding timeout in dhcpcd.conf I will also read this page carefully: http...

davef

No apologies necessary. As I do not understand the dhcp/dhcpcd network acquisition process I will likely post incorrect clues to help solving it! Maybe some more information on the ESP8266. My understanding it is operating in "beacon mode" and is operating "open" key_management.....

Search found 64 matches

Re: Running Python script from crontab doesn't display

Running Python script from crontab doesn't display

Re: buster: logrotate is now driven by systemd

Re: 3B+, Buster and 3G dongle unwanted data usage

3B+, Buster and 3G dongle unwanted data usage

Re: Cron stops on swapping HDMI or keyboard

Re: Cron stops on swapping HDMI or keyboard

Re: Cron stops on swapping HDMI or keyboard

Cron stops on swapping HDMI or keyboard

Re: Internet data usage, Jessie versus Stretch

Internet data usage, Jessie versus Stretch

Re: I2C ignorating decimal points. MPPT solar

Re: Adding an I2C device via sysfs -- how to specify parameters?

Re: Losing connection after setting up hotspot and connecting back to wifi

Re: Losing connection after setting up hotspot and connecting back to wifi

Re: Huawei GSM dongle used both as network adapter AND GSM

Re: Connect Raspi to two different wifi networks with two wifi adapters

Re: Some dhcpcd stuff still runs after a purge

Re: Some dhcpcd stuff still runs after a purge

Re: Some dhcpcd stuff still runs after a purge

Some dhcpcd stuff still runs after a purge

Re: Switching wlan0 connections takes a long time

Re: Switching wlan0 connections takes a long time

Re: Switching wlan0 connections takes a long time

Re: Switching wlan0 connections takes a long time