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This PR defines two error codes for tcp_send/recv according to whether the error was a timeout or another error. This is used to fill in a new timed_out flag in the http response structure. Finally this is checked by the upnp protocol code to return PROTOCOL_ERR_TIMEOUT if necessary.
This means that if a protocol fails to complete successfully due to a TCP timeout it will be retried under the same system that is used for timing out waiting for broadcast responses.