diff --git a/serial/Makefile b/serial/Makefile
index 8ceb6ee..c8fb1c1 100644
--- a/serial/Makefile
+++ b/serial/Makefile
@@ -1,3 +1,5 @@
+# ---------------------------------------------------
+#  May be we have to put those objs in a .a ?
 
 OPT = -Wall -DDEBUG_LEVEL=0
 OBJS = serial.o funcs.o
diff --git a/serial/serial.c b/serial/serial.c
index 34c79f5..c4d52e3 100644
--- a/serial/serial.c
+++ b/serial/serial.c
@@ -122,13 +122,26 @@ byte = 0;
 foo = read(fd, &byte, 1);
 if (1 != foo)
         {
-	fprintf(stderr, "byte %d rd %d errno %d\n",
-					byte, foo, errno);
+	fprintf(stderr, "%s : byte %d rd %d errno %d\n",
+				__func__, byte, foo, errno);
         return -1;
         }
 return (int)byte;
 }
+/* -------------------------------------------------------------------- */
+int putbyte(int fd, unsigned char byte)
+{
+int		foo = -1;
 
+foo = write(fd, &byte, 1);
+if (1 != foo)
+        {
+	fprintf(stderr, "%s : %d -> %d errno %d\n",
+				__func__, byte, foo, errno);
+        }
+
+return foo;
+}
 /* -------------------------------------------------------------------- */
 /* timeout is in milliseconds */
 int getbyte_to (int fd, int to_ms)
diff --git a/serial/serial.h b/serial/serial.h
index 2e68924..ba934c7 100644
--- a/serial/serial.h
+++ b/serial/serial.h
@@ -6,8 +6,8 @@
 
 int prepare_UART(char *port, int bauds);
 
-int getbyte(int fd);			/* really brotched func */
-
+int getbyte(int fd);				/* really brotched func */
+int putbyte(int fd, unsigned char byte);
 
 /* timeout is exprimed in milliseconds. */
 int getbyte_to (int fd, int to_ms);