From: Guus Sliepen <guus@meshlink.io>
Date: Sun, 18 Oct 2015 18:53:55 +0000 (+0200)
Subject: Send ACKs also when receiving out-of-order data.
X-Git-Url: https://git.meshlink.io/?a=commitdiff_plain;h=f795503080bc1e7a812d58da62513219d2b5db74;p=utcp

Send ACKs also when receiving out-of-order data.

This is necessary to trigger the triplicate ACK detection on the sender.
---

diff --git a/Makefile b/Makefile
index d10352e..c2429e5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-CFLAGS ?= -O2 -Wall -g
+CFLAGS ?= -Og -Wall -g
 CFLAGS += -std=c99 -DUTCP_DEBUG
 
 BIN = selftest test
diff --git a/utcp.c b/utcp.c
index c21d6ab..25590a0 100644
--- a/utcp.c
+++ b/utcp.c
@@ -1017,6 +1017,7 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 				//Reset the congestion window so we wait for ACKs.
 				c->snd.nxt = c->snd.una;
 				c->snd.cwnd = utcp->mtu;
+				start_retransmit_timer(c);
 			}
 		}
 	}
@@ -1164,7 +1165,7 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 	// - or we got an ack, so we should maybe send a bit more data
 	//   -> sendatleastone = false
 
-	ack(c, prevrcvnxt != c->rcv.nxt);
+	ack(c, len || prevrcvnxt != c->rcv.nxt);
 	return 0;
 
 reset: