No data from sml smartmeter to nodered

[Reiseradler]

Hello,

I am running noderd on a raspberry pi 4 as docker container (as well as mosquitto, timescaledb and grafana). But I fail to get data from a smartmeter (sml) into nodered. The raspi is connected to an optical sensor via usb cable and I get data on the raspi (sudo cat /dev/ttyUSB0 | od -tx1).

I do not find any parameter configuration for the smartmeter node to get any data into nodered. Below you see the 2 nodes flow as well as the properties of the smartmeter node (connection details: 9600 Baud rate, 8N1 - should be fine since it is from the manual and already worked before).

Thank you very much in advance!

[coolchip]

I've never done this but you have to give the docker container access to your serial device (/dev/ttyUSB0). Without this, the docker container isn't able to use it. I've found this with a google search:
https://www.losant.com/blog/how-to-access-serial-devices-in-docker

[Reiseradler]

Thank you very much for your help! Due to your hint I am already one step further.

To check the serial device connection with the docker container I have installed serialport in nodered. After some adjustments (I am not anymore sure which were the important ones) the serialport node in nodered could connect to /dev/ttyUSB0. Now, I get values - strang ones - from my serial device into nodered.

But for the smartmeter node I still get no values even though the parameters are the same than from the serialport node. Do you have any idea?

[coolchip]

Did you completely disable or remove the serial node before using the smartmeter-node? Only one can access a serial port at a time.

[Reiseradler]

Thank you so much!!!
Since deleting the test node "serialport", everything works perfect.

[ToboCop81]

I have the exact same problem - at first I used the wrong serial port - but I was able to fix it. Then I tested it using the serial node and recieved encoded SML data.
But when use the smartmeter node it only shows the following debug message after a view minutes:

"smartmeter-obis error: Error: No or too long answer from Serial Device after last request."

And yes I did delete the serial node and its config node before I used the smartmeter node. - But this did not fix my problem
I have an SGM-C4 Meter:
https://www.efr.de/en/products/smart-energy-devices/electronic-electricity-meters/mme-en/sgm-c4/

I run node-red on a SmartManager Basic from STV:
https://www.stv-electronic.de/produkt/smart-manager-basic/

I use the UART SmartMeterReader from bitShake (directly connected to the second UART port of the SmartManager:
https://amzn.eu/d/cYfLvwk

[ToboCop81]

Here are some scrrenshots of my configuration of the serial node and the payload which is returned in this case:

[coolchip]

Thank you so much!!! Since deleting the test node "serialport", everything works perfect.

That's fine. Enjoy it.

[coolchip]

Here are some scrrenshots of my configuration of the serial node and the payload which is returned in this case:

What is your configuration of the smartmeter-node?

[ToboCop81]

It is the same configuration which @Reiseradler uses:

[coolchip]

The manual of your smartmeter says, that it is using the D0 protocol on the optical interface. You have selected "sml".

[ToboCop81]

Ok that's interesting - because I found a hint to SML in this product manual:
FR-SGM-C4-Produkthandbuch.pdf

Can you provide a link to this manual you found please?
I will try the D0 protocol settings and let you know.

[ToboCop81]

Hi - ich schreibe jetzt auch mal auf Deutsch weiter... Habe die Angabe in dem Datenblatt gefunden - da steht tatsächlich D0 Protokoll. - Im Produkthandbuch steht aber, dass die optische Schnittstelle mit SML arbeitet.. da gibt es wohl einen Widerspruch in der Doku...

Habe mal auf D0 umgestellt - das ist das Ergebnis:

[ToboCop81]

Dieser Forums-Thread könnte evtl auch hilfreich sein (ich selbst steige da noch nicht ganz durch):
https://www.photovoltaikforum.com/thread/158054-libsml-error-unrecognized-sequence-beim-smartmeter-efr-sgm-c4/

Wäre für noch einen Tipp Dankbar :-)