P1 meter suddenly stopped working

[balosa]

Hi all,

I've got a strange problem, at 13-04-2024 01:53:16 the P1 meter suddenly stopper working, I am not receiving data from the meter anymore, there were no changes or other problems during that time that I know of.

Is there a way to pinpoint the problem, I want to know if it's a hardware problem (cable/connector/USB stick) or a software problem (domoticz, pi)

- I checked the cable, everything seems fine
- I tried another USB port on the PI => didn't work
- I restarted the PI => didn't work
- I shutdown the PI and restarted => didn't work
- updated the PI and domoticz (to v2024.4) => didn't work
- log doesn't show any problems
- I loaded an older database version when the P1 meter still worked => didn't work
- I removed the P1 meter in domoticz and re-installed it => didn't work

Hope to hear some suggestions.

Thanks in advance.

P1meter_1.jpg (380.28 KiB) Viewed 1511 times

[HansieNL]

I've set the Data Timeout to 1 minute. If there's no data received for a minute the P1 hardware will be restarted.
Maybe you can enable this option and see if this fix your problem.

[balosa]

Thanks for your response, I tried it but didn't work, not receiving any data.

P1meter_2.jpg (97.86 KiB) Viewed 1501 times

[willemd]

The display of the P1 meter itself still shows data?

Did you turn all debugging on?

[balosa]

yes the P1 meter is showing data, and yes all debugging is on

[willemd]

Maybe there is a way to check communication on /dev/ttyUSB0 directly, without domoticz, to narrow it down further?

[waltervl]

To check if data is coming to Domoticz stop Domoticz, start reading the USB port, check data and after checking start Domoticz again.

Code: Select all

sudo service domoticz stop
sudo cu -l /dev/ttyUSB0 -s 115200
sudo service domoticz start 

In the second step you should see readible data/telegrams coming in. Change the USB port according the setting you have in Domoticz hardware.

See also https://www.domoticz.com/wiki/Dutch_DSM ... th_P1_port

[balosa]

the sudo cu command is not found it says ;

command -> "sudo cu -l /dev/ttyUSB0 -s 115200"
response -> "sudo: cu: opdracht niet gevonden"

[waltervl]

Then you can try one of these alternatives or install cu.
https://www.cyberciti.biz/hardware/5-li ... l-console/

[HvdW]

I'm having trouble with P1 meter readings lately as well.
My setup is P1 on USB0 and RFXtfx433 on USB1
I installed PersistentUSBdevices as well and set both up as /dev/ttyUSB-P1 and /dev/ttyUSB-RFX433

Every now and then there's no input on Power and Gas and switches don't react.
Then I change eiter to USB1 and USB0 or to /dev/ttyUSB-P1 and /dev/ttyUSB-RFX433 and everything is working as expected.
There are no errors in the log.

This behaviour is random and happening about once in 2, 3 weeks (I think)

[waltervl]

Perhaps you have /dev/serial/by-id devices on your system (on recent OS)? You better use those as that should prevent switching serial devices by the OS.

[HvdW]

Perhaps you have /dev/serial/by-id devices on your system (on recent OS)? You better use those as that should prevent switching serial devices by the OS.

Maybe I do not understand exactly what you mean.
Anyway this is what I have.
RPI4 2G running Bullseye.

Code: Select all

#RFXtrx433
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="A1XECZN7", SYMLINK+="ttyUSB-RFX433"
# P1 converter
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="P1Z4BCV9", SYMLINK+="ttyUSB-P1"
# S0 pulse meter
SUBSYSTEM=="tty", ATTRS{idVendor}=="2109", ATTRS{idProduct}=="3431", SYMLINK+="ttyUSB-S0-Pulse"

If something should be stated otherwise, please explain.

[waltervl]

If you do an

Code: Select all

ls -l /dev/serial/by-id

you should see all your connected USB devices by ID. These will not change even if you put the device in another USB Port. So similar to creating Persistant devices manually. This is standard Linux functionality now. This is also mentioned in the wiki page header for persistent devices you already referred too.

But you are hijacking a topic of somebody else now....

@balosa how is the directly debugging of the serial line to P1 meter going?

[balosa]

managed to install cu (sudo apt-get install cu)

see screenshot for the message, it says the Line is in use

P1meter_3.jpg (13.27 KiB) Viewed 1345 times

[waltervl]

Did you stop Domoticz before trying cu? Else Domoticz is using the device.

[balosa]

yes i did

pi@raspberrypi:~ $ sudo service domoticz stop
pi@raspberrypi:~ $ sudo cu -l /dev/ttyUSB0 -s 9600
cu: open (/dev/ttyUSB0): Permission denied
cu: /dev/ttyUSB0: Line in use

[waltervl]

You can try to not use sudo.
If still it is not working you probably have to root cause of the issue: Domoticz has no access anymore to the USB port.

Was there an update on your system? Also google on ttyUSB permission denied in relation with your Operating system to see how to solve it.

[balosa]

ok thank you for your suggestion, I will try some things tomorrow, I will post any progress here

[gizmocuz]

And as Walter mentioned before, when you have multiple USB devices connected to the system, use the serial-by-id device as the USB devices could be swapped internally (ttyUSB0 with ttyUSB1) when the machine is rebooted.

You also did not mention what hardware you are using.

[balosa]

sorry about that, i use a raspberry Pi 3+
only things connected are a Sonoff 433 Mhz bridge, P1 meter (cable), and a USB drive with the software

can you pinpoint me to the direction how i could use the serial-by-id