#define RX_ACK_DELAY 8 /* Ack generated since nothing has happened since receiving packet */
#define RX_ACK_IDLE 9 /* Similar to RX_ACK_DELAY, but can
* be used to compute RTT */
+#define RX_ACK_MTU -1 /* will be rewritten to ACK_PING */
/* Packet acknowledgement type */
#define RX_ACK_TYPE_NACK 0 /* I Don't have this packet */