Add a callback that is triggered when the retransmission timeout expires.

This can be used by the application to detect potential network problems.

diff --git a/utcp.c b/utcp.c
index 19f6cfaf098377bc748de022bdfe506912796482..20d86c27c6135e8b35e78db94f7fbedfbec747b5 100644 (file)
--- a/utcp.c
+++ b/utcp.c
@@ -890,6 +890,10 @@ static void retransmit(struct utcp_connection *c) {
 
        struct utcp *utcp = c->utcp;
 
+       if (utcp->retransmit) {
+               utcp->retransmit(c);
+       }
+
        struct {
                struct hdr hdr;
                uint8_t data[];
@@ -2447,6 +2451,10 @@ void utcp_offline(struct utcp *utcp, bool offline) {
        }
 }
 
+void utcp_set_retransmit_cb(struct utcp *utcp, utcp_retransmit_t retransmit) {
+       utcp->retransmit = retransmit;
+}
+
 void utcp_set_clock_granularity(long granularity) {
        CLOCK_GRANULARITY = granularity;
 }

diff --git a/utcp.h b/utcp.h
index aed177cb2913bd4dc82fd7a6bbdc8e137c36d634..ff509ac936e1d440fa151d32eb0a576e32d06f09 100644 (file)
--- a/utcp.h
+++ b/utcp.h
@@ -56,6 +56,7 @@ struct utcp_connection;
 
 typedef bool (*utcp_pre_accept_t)(struct utcp *utcp, uint16_t port);
 typedef void (*utcp_accept_t)(struct utcp_connection *utcp_connection, uint16_t port);
+typedef void (*utcp_retransmit_t)(struct utcp_connection *connection);
 
 typedef ssize_t (*utcp_send_t)(struct utcp *utcp, const void *data, size_t len);
 typedef ssize_t (*utcp_recv_t)(struct utcp_connection *connection, const void *data, size_t len);
@@ -92,6 +93,7 @@ extern void utcp_set_mtu(struct utcp *utcp, uint16_t mtu);
 extern void utcp_reset_timers(struct utcp *utcp);
 
 extern void utcp_offline(struct utcp *utcp, bool offline);
+extern void utcp_set_retransmit_cb(struct utcp *utcp, utcp_retransmit_t retransmit);
 
 // Per-socket options
 

diff --git a/utcp_priv.h b/utcp_priv.h
index 58e2715a3c701cc392997b66c2bc85729f850336..197fd2685a32416f46bc87652ddae5bb27664553 100644 (file)
--- a/utcp_priv.h
+++ b/utcp_priv.h
@@ -178,6 +178,7 @@ struct utcp {
 
        utcp_accept_t accept;
        utcp_pre_accept_t pre_accept;
+       utcp_retransmit_t retransmit;
        utcp_send_t send;
 
        // Packet buffer