continous readout of info-interface via USB-IR stops sporadically

[sanktnelson]

I am trying to continously read the info output from a EMH eHZ P-Series smartmeter. The meter puts out an info message every second. This goes to a raspberry pi via a USB-IEC optical to USB serial interface. The setup works in principle, i.e. I see the msg object, I can split out the values I care about and display them. However, it does not work continously. Every few messages the readout pauses for a few minutes, then I get an error, then it continues.
The Error is not always the same and neither is the timeout.
examples:

This Error always pauses for exactly 2mins:
1/13/2025, 1:28:53 PMnode: full_msg
msg : Object
{ payload: object, _msgid: "7dae87cc.5159b8" }
1/13/2025, 1:30:53 PM
msg : string[90]
"smartmeter-obis error: Error: No or too long answer from Serial Device after last request."
1/13/2025, 1:31:12 PMnode: full_msg
msg : Object
{ payload: object, _msgid: "dd2cb063.0e807" }

This one has variable pause times:
1/13/2025, 1:31:23 PMnode: full_msg
msg : Object
{ payload: object, _msgid: "df64e3a8.32fc9" }
1/13/2025, 1:33:20 PM
msg : string[614]
"smartmeter-obis error: Error: Error while parsing SML message: Error: Wrong TL-Field 0x60 for Choice!: Message: 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"
1/13/2025, 1:33:21 PMnode: full_msg
msg : Object
{ payload: object, _msgid: "c0a4ce78.4951f" }

I suspect some transmission error causes the underlying code to not recognize the message and then it waits until some buffer overflows or a timeout occurs. Is it possible to make that timeout configurable, since in this application it should always be below 1.5s?

I am running node-red-contrib-smartmeter 0.5.1 on redmatic 7.2.1

[sanktnelson]

ping
anyone home?

[sanktnelson]

pong
any pointers where to start?
I am able to code, however I am completely unfamiliar with nodered otherwise. So I don't even know which options I have for debugging or which module I should be looking at.

[sanktnelson]

Even though I seem to be talking to myself:
This is at least in part a timeout issue. I found 2min timeout setting in the underlying smartmeter-obis module and hardcoded it to 1.1s. With that, at least the 2min wait goes away, but the errors themselves remain. Since this is apparenly not an issue with this code here, I will open an issue at smartmeter-obis. However I would recommend to expose the timeout and messageSize settings for the smartmeter-obis module in the node, as 2min timeout simply makes no sense.