+ * rconn_connect_unreliably() to connect it.
+ *
+ * Connections made by the rconn will automatically negotiate an OpenFlow
+ * protocol version acceptable to both peers on the connection. The version
+ * negotiated will be one of those in the 'allowed_versions' bitmap:
+ * version 'x' is allowed if allowed_versions & (1 << x) is nonzero. If
+ * 'allowed_versions' is zero, then OFPUTIL_DEFAULT_VERSIONS are allowed.
+ **/