Node-red freezes running only a few nodes

#1

Hello everybody.
I am quite new to node-red so I hope you bear with me. On January I started my first Raspberry Pi projects. Sooner or later I found out some visualization would be quite nice. So I run a search and found Node-red which was exactly what I was looking for. I started some small flows and all was quite promising.

Now, I am running node-red on my Raspberry Pi3 to visualize temperature sensors of my solar boilers. There are 4 temperatur sensors (ds18b20) for each boiler (2 boilers). Furthermore I wanted to display date and time. I created all flows and deployed but as I wanted to display on my dashboard nothing happened. My Raspberry PI was dead no reaction on any mouse click what so ever. CPU on my Raspberry was about 30% but I think that should at least permit to start my console.
Some details:

Node-red version V8.11.3
NPM Version 5.6.0

Since I am a new user I am not allowed to upload my flows. That would make it easier to explain. I am still convinced that Node-red is a super tool but at the moment I have no idea what to do.

All help is much appreciated.

leafboy

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#2

If you go to the raspberry pi page in the documents on the node-red website there’s a script you can run to get you onto a standard platform

On the same page there’s details of how to access the log files, if it stops again then look at the logs

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#3

How do you know what the CPU was if it was not responding?

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#4

Dear all.

Thanks a lot for your replay.
@colin: Last time before it freezes I checked but this might be due to other processes. I can’t relate this to node-red.

@ukmoose: I run this script serveral times before. There are a few warnings and this error:

node-pre-gyp ERR! Tried to download(404): https://github.com/kelektiv/node.bcrypt.js/releases/download/v1.0.3/bcrypt_lib-v1.0.3-node-v57-linux-arm.tar.gz
node-pre-gyp ERR! Pre-built binaries not found for bcrypt@1.0.3 and node@8.11.3 (node-v57 ABI) (falling back to source compile with node-gyp)

I am not sure if this is what the problem causes.
Any further hints :wink: sorry, as I wrote at the beginning I am a total newbee and some kind of lost.

Many thanks in advance for your assistance.

leafboy

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#5

Those messages are just for information, they do not indicate a problem.

Is the pi completely unresponsive? Any mouse movement? If you have a keyboard plugged in does the caps lock switch the caps lock led on/off?

When it hangs how do you get the pi going again? Do you have to power cycle? If so then note the time, then wait about a minute and then power cycle. Then have a look in the system log file (/var/log/syslog). Paste the last 20 or 30 lines here from before the reboot log. Looking at the time in the log is the end of the log when it hung or when you power cycled (in other words is there anything written to the log after it hung?

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#6

Actually I connect remote to my Pi via my linux laptop. The connection gets lost and I have to restart all over again. I noticed as soon I start Node-red a lot of messages appear in the console. I created a date and time flow which updates every second. Maybe this causes the crash. But how can I delete or alter it without starting Node-red?

thanks
leafboy

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#7

I renamed the start file in directory .node-red to startold and ran Node-red again it worked. No crash. It seems as soon as a lot of payloads are created my Pi crashes. Could this be the case and how can I solve that problem?

Thank you very much.

leafboy

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#8

read the thread above and paste the logs after nodered has crashed here

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#9

sorry - but where can I find the thread?

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#10

This thread

post 2 asks for you to look at the logs

post 5 asks you to paste from the logs

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#11

Paste those messages here.

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#12

Sorry - I got it.
I run the scripts on the raspberry pi documentation but this did not solve the problem. Unfortunately I cant paste the messages because when mi Pi freezes not even a screen shot is possible but these are normal payloads from the nodes, as they seem to me. They appear on my linux laptop as well. Do think this has to do regarding lack of memory?

Thanks for your patience
leafboy

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#13

the logs should be there after you have restarted your pi- have you checked?
Its far easier to look at the logs and see rather than guessing as to likely causes

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#14

Looking into the log files showed there has been no chance since updating:

make: Verzeichnis »/home/pi/.node-red/node_modules/serialport/build« wird verlassen
node-red-contrib-dht-sensor@1.0.1 /home/pi/.node-red/node_modules/node-red-contrib-dht-sensor
node-dht-sensor@0.0.34 /home/pi/.node-red/node_modules/node-dht-sensor
nan@2.8.0 /home/pi/.node-red/node_modules/node-dht-sensor/node_modules/nan
node-red-contrib-ibm-watson-iot@0.2.8 /home/pi/.node-red/node_modules/node-red-contrib-ibm-watson-iot
ibmiotf@0.2.41 /home/pi/.node-red/node_modules/ibmiotf
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Der Benutzer »pi« ist bereits ein Mitglied der Gruppe »gpio«.
Finished : Son Jun 24 12:31:45 UTC 2018

Due to restrictions I had to delete the first lines (only 32000 char. are allowed). This is the last line since I update as shown on the raspberry I docs
Thanks
leafboy

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#15

I managed to create a screen shot of the messages shown in the console. Would this be helpful?

Thanks
leafboy

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#16

I thought you were connected via ssh, so the terminal is running on the PC not the pi. Are the messages flashing past very quickly continuously? If so then node red has not crashed it is just that for some reason you are asking it to run something extremely fast. You should be able to see from the messages what it is that is happening so fast.
You will probably find it much easier if you run the browser on the PC rather than the pi (if that is what you are doing) then the pi does not have to do all the work of running the browser.

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#17

Yes - I connect to my Pi via SSH and finally I managed to add a screen shot to my posts. These messages seem quite normal but how can I stop it to maintain other settings. As soon as I start node-red I freezes I no access to node-red is possible. Is it not due to lack of memory that it feezes?

tx
leafboy

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#18

No, it is most unlikely to be lack of memory.
Please make sure you answer all the questions, you did not say whether the messages on the console are continuously coming very fast - faster than you would expect them to be.
Is that screenshot of a pi screen or a PC screen? You said you are connected via ssh so I assumed it would a screenshot of the PC. I don’t use the graphical interface on the pi at all so I don’t know what it looks like.
Also you say node red is freezing, do the debug messages on the console keep going or do they stop? If they stop then it is the messages when it stops that we need to see. If they don’t stop then node-red is still running.
If the messages don’t stop do you mean that it is the browser that is unresponsive?
Are you running the browser on the pi or on the PC? If you are running it on the pi (which will probably require much more resources than node red does) then try running the browser on the PC by pointing to the ip address of the pi.
By the way you can copy out of the terminal window using Ctrl+Shift+C (at least on some operating systems) so you can paste what you see in logs rather than screenshotting.
As I said, please make sure you answer all the questions.

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#19

Sorry for my late and not sufficient answer. I deleted my old flows in the .node-red folder and started all over again. Then I created 10 temp-sensors DS18B20 and injected at every 10s a time stamp. So far it works all fine and the debug messages appear correctly. After adding some nodes to display time and date. Still working fine. But after adding a DHT22 sensor my PI crashed again. No debug messages were given and the connection to my Tablet got lost (connection lost). This is when I have to restart my PI because no further actions were possible after that.

The browser is running on my PI.

The added screenshot above is from my PI before it freezes.

I tried to copy the debug messages but my PI already stopped working only a screenshot of the debug messages was possible. See below.

That does not look as error messages to me. Later on I will try running my browser on the PC.

Hopefully I did answer all your questions. Many thanks for your support it is much appreciated.

tx
Leafboy

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#20

What node are you using for the dht22? If it is the node-red-contrib-dht-sensor, did you install the BCM2835 library and node-dht-sensor as it tells you to?

Can you paste in your flow now?

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