--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mb_tcp_private.h	Sun Mar 05 00:05:46 2017 +0000
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2002,2016 Mario de Sousa (msousa@fe.up.pt)
+ *
+ * This file is part of the Modbus library for Beremiz and matiec.
+ *
+ * This Modbus library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this Modbus library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This code is made available on the understanding that it will not be
+ * used in safety-critical situations without a full and competent review.
+ */
+
+
+
+#ifndef MODBUS_TCP_PRIVATE_H
+#define MODBUS_TCP_PRIVATE_H
+
+
+#include "mb_util.h"
+
+
+/* tcp port default configuration... */
+#define DEF_SERVICE  "502"        /* port used by modbus */
+#define DEF_PROTOCOL "tcp"        /* protocol used by modbus tcp */
+#define DEF_TYPE     SOCK_STREAM  /* Quality of service required of the socket... */
+#define DEF_MAX_PENDING_CONNECTION_REQUESTS 5
+                                  /* maximum number of pending connection requests
+                                   * that have not yet been accept()'ed
+                                   */
+#define DEF_CLOSE_ON_SILENCE 1    /* Used only by master nodes.
+                                   * Flag indicating whether, by default, the connection
+                                   * to the slave device should be closed whenever the
+                                   * modbus_tcp_silence_init() function is called.
+                                   *
+                                   * 0  -> do not close connection
+                                   * >0 -> close connection
+                                   *
+                                   * The spec sugests that connections that will not
+                                   * be used for longer than 1 second should be closed.
+                                   * Even though we expect most connections to have
+                                   * silence intervals much shorted than 1 second, we
+                                   * decide to use the default of shuting down the
+                                   * connections because it is safer, and most other
+                                   * implementations seem to do the same.
+                                   * If we do not close we risk using up all the possible
+                                   * connections that the slave can simultaneouly handle,
+                                   * effectively locking out every other master that
+                                   * wishes to communicate with that same slave.
+                                   */
+
+ /* Since the receive buffer is also re-used to store the frame header,
+  * we set it to the larger of the two.
+  */
+#if     TCP_HEADER_LENGTH > MAX_L2_FRAME_LENGTH
+#define RECV_BUFFER_SIZE    TCP_HEADER_LENGTH
+#else
+#define RECV_BUFFER_SIZE    MAX_L2_FRAME_LENGTH
+#endif
+
+
+
+
+#endif  /* MODBUS_TCP_PRIVATE_H */
+
+
+
+
+
+
+
+