diff --git a/src/network.c b/src/network.c
index 192e945..910f323 100644
--- a/src/network.c
+++ b/src/network.c
@@ -221,7 +221,21 @@ default_cb_in(int fd, struct ipc_message *m)
 enum ipccb
 default_cb_out(int fd, struct ipc_message *m)
 {
-	printf("TODO: default_cb_out\n");
+	size_t msize = 0;
+	SECURE_DECLARATION (struct ipc_error, ret);
+	SECURE_BUFFER_DECLARATION (char, buf, IPC_MAX_MESSAGE_SIZE);
+	char *pbuf = buf;
+
+	ipc_message_format_write (m, &pbuf, &msize);
+
+	size_t nbytes_sent = 0;
+	ret = usock_send (fd, buf, msize, &nbytes_sent);
+
+	// On error or if what was sent != what should have been sent.
+	if (ret.error_code != IPC_ERROR_NONE || nbytes_sent != msize) {
+		return IPC_CB_FD_ERROR;
+	}
+
 	return IPC_CB_NO_ERROR;
 }
 
@@ -236,7 +250,6 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 	// read and write automatically and provide a new IPC_EVENT_TYPE indicating the switch.
 	T_R ((ctx->switchdb.size == 0), IPC_ERROR_FD_SWITCHING__NO_FD_RECORD);
 
-	printf ("coucou\n");
 	int talkingfd = ctx->pollfd[index].fd;
 	int dest_fd = -1;
 	struct ipc_switching sw;
@@ -248,7 +261,6 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 	is_valid = ipc_switching_get_ (&ctx->switchdb, talkingfd, &sw);
 
 	T_R ((is_valid == -1), IPC_ERROR_FD_SWITCHING__NO_FD_RECORD);
-	printf ("valid\n");
 
 	if (sw.orig == talkingfd) {
 		dest_fd = sw.dest;
@@ -268,7 +280,6 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 			r = (*sw.dest_in)(talkingfd, &m);
 		}
 	}
-	printf ("cb done\n");
 
 	// Message reception OK: reading the message and put it in the list of messages to send.
 	if (r == IPC_CB_NO_ERROR) {
@@ -282,8 +293,6 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 		IPC_RETURN_NO_ERROR;
 	}
 
-	printf ("error or disconnection\n");
-
 	/**
 	 * NOTE: In any other case, the fd is, or should be closed.
 	 */
@@ -299,11 +308,9 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 
 	// 2. set event (either error or disconnection)
 	if (r == IPC_CB_FD_CLOSING) {
-		printf ("DISCONNECTION\n");
 		IPC_EVENT_SET (event, IPC_EVENT_TYPE_DISCONNECTION, index, talkingfd, NULL);
 	}
 	else {
-		printf ("ERROR\n");
 		IPC_EVENT_SET (event, IPC_EVENT_TYPE_ERROR, index, talkingfd, NULL);
 	}