Mailbox monitor with Zigbee

In this article, I will explain how I monitor my mailbox to get notified when the Postman has passed. I am using a ZigBee door/window sensor to monitor if the postbox slit has been opened. The challenge here is to have a stable ZigBee network up to the front roadside since only the devices connected to mains act as a router/repeater (battery-powered ones don’t). So in order to have a stable network across the house,

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