From 9002a0d29362705ae26f819dd6426626e667505b Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@leeloo.lan.home.verplant.org>
Date: Sat, 27 Mar 2010 15:01:35 +0100
Subject: [PATCH] modbus plugin: Downgrade to use the libmodbus 1.2.5 API.

The API of the library changes every other month, so be conservative and
use the "stable" version, released in May 2008, and hope *that* API is
somewhat stable.
---
 src/modbus.c | 59 ++++++++++++++++-------------------------------------------
 1 file changed, 16 insertions(+), 43 deletions(-)

diff --git a/src/modbus.c b/src/modbus.c
index 78c43350..5dc958f6 100644
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -24,8 +24,18 @@
 #include "plugin.h"
 #include "configfile.h"
 
+#include <netdb.h>
+
 #include <modbus/modbus.h>
 
+#ifndef MODBUS_TCP_DEFAULT_PORT
+# ifdef MODBUS_TCP_PORT
+#  define MODBUS_TCP_DEFAULT_PORT MODBUS_TCP_PORT
+# else
+#  define MODBUS_TCP_DEFAULT_PORT 502
+# endif
+#endif
+
 /*
  * <Data "data_name">
  *   RegisterBase 1234
@@ -271,8 +281,10 @@ static int mb_init_connection (mb_host_t *host) /* {{{ */
 
   modbus_set_debug (&host->connection, 1);
 
+#if 0
   /* We'll do the error handling ourselves. */
   modbus_set_error_handling (&host->connection, NOP_ON_ERROR);
+#endif
 
   if ((host->port < 1) || (host->port > 65535))
     host->port = MODBUS_TCP_DEFAULT_PORT;
@@ -281,8 +293,10 @@ static int mb_init_connection (mb_host_t *host) /* {{{ */
       host->node, host->port);
 
   modbus_init_tcp (&host->connection,
-      /* host = */ host->node,
+      /* host = */ host->node);
+#if 0
       /* port = */ host->port);
+#endif
 
   status = modbus_connect (&host->connection);
   if (status != 0)
@@ -311,7 +325,7 @@ static int mb_init_connection (mb_host_t *host) /* {{{ */
 static int mb_read_data (mb_host_t *host, mb_slave_t *slave, /* {{{ */
     mb_data_t *data)
 {
-  uint16_t values[2];
+  int values[2];
   int values_num;
   const data_set_t *ds;
   int status;
@@ -832,47 +846,6 @@ static int mb_config (oconfig_item_t *ci) /* {{{ */
 
 /* ========= */
 
-#if 0
-static int foo (void) /* {{{ */
-{
-  int status;
-  uint16_t values[2];
-  int values_num;
-
-  if (dev == NULL)
-    return (EINVAL);
-
-  printf ("mb_read (addr = %i, float = %s);\n", register_addr,
-      is_float ? "true" : "false");
-
-  memset (values, 0, sizeof (values));
-  if (is_float)
-    values_num = 2;
-  else
-    values_num = 1;
-
-  status = read_holding_registers (dev->connection,
-      /* slave = */ 1, /* start_addr = */ register_addr,
-      /* num_registers = */ values_num, /* buffer = */ values);
-  printf ("read_coil_status returned with status %i\n", status);
-  if (status <= 0)
-    return (EAGAIN);
-
-  if (is_float)
-  {
-    float value = mb_register_to_float (values[0], values[1]);
-    printf ("read_coil_status returned value %g (hi %#"PRIx16", lo %#"PRIx16")\n",
-        value, values[0], values[1]);
-  }
-  else
-  {
-    printf ("read_coil_status returned value %"PRIu16"\n", values[0]);
-  }
-
-  return (0);
-} /* }}} int foo */
-#endif
-
 static int mb_shutdown (void) /* {{{ */
 {
   data_free_all (data_definitions);
-- 
2.11.0