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Tested against the car Orin: the tablet is USB host to the Orin's NCM gadget (192.168.55.1). Android routes app traffic over it only when it is the default network, so the app must bind to TRANSPORT_ETHERNET. PD changes cost ~3 s, and an idle tablet off charger sleeps and goes silent, so the app keeps the device awake. Two guidelines follow. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>