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When running my application with FreeRTOS and LwIP, the code sometimes reports "netconn error" upon attempting a tcp connection. When this happens, the application reports successful tcp connection, but packets are never received on the other end. This remains true even after calling tcp_disconnect and reconnecting, although "netconn error" is never displayed again. The only solution I have found is rebooting the board.
If the app doesn't print "netconn error" on the first tcp connection attempt, the tcp connection will succeed and data will be transmitted.