Smart Meter: decoder values with arithmetic calculations get stuck

[redm123]

Hi! I'm using a decoder line with =m arithmetic calculation (see below). It creates a combined value from in and out values, which in turn are calculated using =d lines. So the =m line should be identical with either in or out. This generally works as expected. But frequently this =m value gets stuck for seconds, minutes, or longer.

See this screenshot: In the green circles (and some shorter sections in between) the green =m line (decoder 5) matches the yellow line (decoder 3), as expected. In the pink circles however, the =m is somehow stuck. It eventually recovers back to the yellow line, before it gets stuck again sooner or later.

Meter config:

M 1
+1,3,s,16,9600,EFR-SGM
1,77070100010800ff@1000,Bezug Total,kWh,Total_in,4
1,77070100020800ff@1000,Einspeisung Total,kWh,Total_out,4
1,=d 1 60 @1,1-min-Leistung In ±6W,W,Pcurrent1_in,0
1,=d 2 60 @1,1-min-Leistung Out ±6W,W,Pcurrent1_out,0
1,=m 4*#-1+3 @1,1-min-Leistung ±6W,W,Pcurrent1,0

[gemu2015]

the median filter also applies to your =d and =m calculations
either disable the median filter for that meter or calculate your values as described in the other post

[redm123]

ok, I tried again with disabled median filter ... but the stuck =m line remains (green line is =m, yellow the source =d, in theory identical)

[gemu2015]

i can't comment on this until i see your descriptor. =d has been proved to work very well in many users when used for what it was meant for
to calculate instant power from a meter that only has total power.
use scripting math for more sophisticated calculations.

[redm123]

use scripting math for more sophisticated calculations.

Well sure, fair enough. But it would make things a lot easier, if one could just use =m for simple calculations, instead of understanding how scripting in general works.
AND I mean, it seems to work, kind of ... the =m line follows the yellow =d graph, generally, and there are times where it even produces perfectly fine and exact results. So it's not that it is entirely not working or entirely producing nonsense... So maybe there is something fixable? That was just my thought, but feel free to ignore...

The descriptor is the same as in the initial post, just without median flag:

M 1
+1,3,s,0,9600,EFR-SGM
1,77070100010800ff@1000,Bezug Total,kWh,Total_in,4
1,77070100020800ff@1000,Einspeisung Total,kWh,Total_out,4
1,=d 1 60 @1,1-min-Leistung In ±6W,W,Pcurrent1_in,0
1,=d 2 60 @1,1-min-Leistung Out ±6W,W,Pcurrent1_out,0
1,=m 4*#-1+3 @1,1-min-Leistung ±6W,W,Pcurrent1,0
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