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Low cost Zigbee GU10s via Ikea (UK)
(www.ikea.com)
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Z2M, and it was definitely routing via the bulb. The ZigBee dimmer unit couldn't reach the coordinator directly (I might have mounted it in a metal wall box, with a metal front plate). It was connecting to the bulb and working fine however. When the bulb was off, the dimmer completely lost connectivity.
It might only be some of their bulbs, but they can definitely act as repeaters.
Interesting.
I remember having constant disconnects with my several aqara devices when i only had a path of bulbs to connect to. Those bulbs have constant power and are not turned off.
And when checking ZHA visualization i saw that they don't connect to the bulbs but rather tried to connect directly to my stick but only got minimal connection because of the distance. No matter what i tried, they would not connect to the bulbs