Hello.
If I understand you correctly, you want to upgrade and buy the M3 gateway. If so, then I recommend it to you. The M3 gateway opens up a wide range of possibilities for other devices (not manufactured by Aqara) using Matter communication. Also, your current M2 gateway becomes useful further and expands your capabilities. The M3 gateway becomes a coordination center for the M2 gateway in your system and almost all automation becomes local.
I want to show the principle of connections in the system, for your correct understanding, many users have a problem with this.
Zigbee (battery) ->Zigbee (repeater, 220 v with zero)->М2->WiFi<-М3<-Zigbee (repeater, 220 v with zero)<-Zigbee (battery).
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