Errors associated with transport.
Connection cannot be established due to a reason not listed here.
SDLTransportErrorUnknown = -1
case unknown = -1
TCP connection is refused. Probably specified port number is invalid, or SDL Core is not running on the head unit.
SDLTransportErrorConnectionRefused = -2
case connectionRefused = -2
TCP connection cannot be established within given time. Probably because of wrong IP address, or the connection may be blocked by a firewall.
SDLTransportErrorConnectionTimedOut = -3
case connectionTimedOut = -3
TCP connection cannot be established since network is down. Probably the phone is not connected to the correct network.
SDLTransportErrorNetworkDown = -4
case networkDown = -4