Smart Coffee Machine Uploads ~1TB in 10 Days, Nearly Cripples Wi-Fi Access Point

At a Glance (China Coffee Network): Kuai Technology reported on Oct 8 that an overseas Keurig K-Supreme Smart coffee machine generated roughly 1TB of traffic in ten days, nearly crippling the Wi-Fi access point; the cause remains unknown.

Kuai Technology reported on October 8 that many of today’s home appliances have added connectivity and taken the name of “smart appliances,” but recently an overseas Keurig K-Supreme Smart coffee machine generated about 1TB of traffic in ten days, nearly overwhelming the Wi-Fi access point; the cause remains unknown.

A screenshot of Ubiquiti UniFi network management, posted by a U.S. user named Nomad on social media, shows the coffee machine produced about 1,008.45 GB of traffic over 10 days and 9 hours, at an average rate of about 9 Mbit/s. For a coffee machine this volume is utterly absurd, and at one point it even pushed the Wi-Fi access point’s load too high.

The Keurig K-Supreme Smart only supports 2.4GHz Wi-Fi; its connected features include scheduling a brew via an app, saving personal settings and remote control. Under normal use, it has no need at all for sustained high-speed data transfer.

Further investigation later found that most of this traffic stayed within the home local network, and there is no evidence the coffee machine actually uploaded 1TB of data to Keurig or an external service; the owner simply disconnected the machine from the network.

9 Mbit/s is not a large bandwidth for the Wi-Fi access point itself, yet the owner still reported the AP was overwhelmed; possible reasons include a large number of small packets, broadcast or multicast traffic, repeated retransmissions or instantaneous spikes.

Ubiquiti officially also lists excessive multicast traffic as one of the common causes of high Wi-Fi occupancy, but without packet captures, none of these suspicions can be confirmed.

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