Research Android nearby-device transport constraints

[rufatixx]

Goal

Produce a research note for one realistic Android nearby-device transport option without implementing or advertising a mesh network.

Questions

• permissions and user consent across supported Android versions
• discovery, connection, framing, and payload-size constraints
• foreground-service and background-execution rules
• identity binding and abuse controls
• cancellation, retries, power use, and device lifecycle
• emulator limitations and the minimum real-device test matrix

Acceptance criteria

• Sources are linked to current official Android documentation.
• Product-policy constraints are separated from protocol design.
• The note recommends a narrow proof-of-concept scope.
• No Bluetooth, Wi-Fi Direct, or mesh capability is claimed as implemented.