As described in EDL21 showing wrong values (partially) the EDL21 Integration show negative Power consumtion if the Smart meter show ID DZG 00 xxxxx.
The official Type on my Smart meter is DWS74 or DVS74.
The Cause and a Workarround is described in hardware:channels:meters:power:edl-ehz:dzg_dvs74 [wiki.volkszaehler.org].
Is it possible to integrate this in the EDL21.