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TMS320F28384D: LWIP connection status

Part Number: TMS320F28384D


I am using the LWIP sample project. Is there anyway to indicate the TCPIP is still alive or not in case the ethernet cable is disconnected? I have a client software to talk to the device through Ethernet. I would like to detect the connection status when I unplug the ethernet cable intentionally. Is there any parameters that will be returned?