oups, need more tests

Gaby/transmit.c

@@ -116,9 +116,11 @@ if (number<0 || number>16) {
 
 sprintf(message, "T%01x%1x", number, state);
 fprintf(stderr, "%s ----> '%s'\n", __func__, message);
-
-
-
+foo = write(fdtx, message, 3);
+if (3 != foo) {
+	perror("write ?");
 	return -1;
 	}
+return 0;
+}
 /* ---------------------------------------------------------------- */