Slaves send HEARTBEAT every 1s; the master marks clients inactive after
3s without traffic and reactivates on reconnect. CLIENT_INFO reports
last_ping as milliseconds since the last packet, not uptime.
Co-authored-by: Cursor <cursoragent@cursor.com>
Refactor into version/clients subcommands with shared serial framing
to list registered slaves from the master over UART.
Co-authored-by: Cursor <cursoragent@cursor.com>
Expand main/README with master/slave overview, boot config, protocols,
and build notes; point goTool README at the full system doc.
Co-authored-by: Cursor <cursoragent@cursor.com>
Framed protobuf client for /dev/ttyUSB0 at 921600 baud with generated
uart_messages types matching the device protocol.
Co-authored-by: Cursor <cursoragent@cursor.com>
