Increase putcom() timeout to 10 seconds to allow network buffers to drain.

src/syncterm/telnet_io.c

@@ -51,8 +51,19 @@ void putcom(char* buf, size_t len)
 	FD_ZERO(&wds);
 	FD_SET(telnet_sock, &wds);
 	struct timeval tv;
-	tv.tv_sec=0;
-	tv.tv_usec=1000;
+	tv.tv_sec=10;
+	tv.tv_usec=0;
+	/*
+	 * Note, this select() call was added when debugging file transfer
+	 * issues presumably because something made it appear to "hang forever".
+	 * Since blocking sockets are used, this is very much not a complete
+	 * fix as the buffer size will usually be greater than the one byte
+	 * select() guarantees you will be able to send().
+	 *
+	 * The original fix waited 1ms in select(), which is unlikely to actually
+	 * allow the ACK to come back fast enough to clear a full output buffer.
+	 * I've increased it to 10s and left the select() in place.
+	 */
 	if(select(telnet_sock+1, NULL, &wds, NULL, &tv) == 1) {
 		char	str[128];
 		char*	p=str;