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this fixes two key issues with PPP: - if we lost the link (eg. serial cable unplugged) then it did not properly restart the link when the cable is plugged back in - if using hardware flow control and the UART write buffer fills up then we would loop sleeping with the TCPIP lock held, which means if the main thread tries to send an IPv4 packet then it could block on the TCPIP lock, and we would watchdog. This is now limited to 1ms max