path: root/epan/dissectors/packet-hartip.c

/* packet-hartip.c
 * Routines for HART-IP packet dissection
 * Copyright 2012, Bill Schiller <bill.schiller@emerson.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * Copied from packet-mbtcp.c
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/stats_tree.h>
#include <epan/expert.h>
#include <epan/prefs.h>
#include "packet-tcp.h"

void proto_register_hartip(void);
void proto_reg_handoff_hartip(void);

static dissector_handle_t hartip_tcp_handle;
static dissector_handle_t hartip_udp_handle;

static gboolean hartip_desegment  = TRUE;

static int proto_hartip = -1;
static int hf_hartip_hdr_version = -1;
static int hf_hartip_hdr_message_id = -1;
static int hf_hartip_hdr_message_type = -1;
static int hf_hartip_hdr_status = -1;
static int hf_hartip_hdr_transaction_id = -1;
static int hf_hartip_hdr_msg_length = -1;

static int hf_hartip_data = -1;
static int hf_hartip_master_type = -1;
static int hf_hartip_inactivity_close_timer = -1;
static int hf_hartip_error_code = -1;

static int hf_hartip_pt_preambles = -1;
static int hf_hartip_pt_delimiter = -1;
static int hf_hartip_pt_short_addr = -1;
static int hf_hartip_pt_long_addr = -1;
static int hf_hartip_pt_command = -1;
static int hf_hartip_pt_length = -1;
static int hf_hartip_pt_response_code = -1;
static int hf_hartip_pt_device_status = -1;
static int hf_hartip_pt_payload = -1;
static int hf_hartip_pt_checksum = -1;

static gint ett_hartip = -1;
static gint ett_hartip_hdr = -1;
static gint ett_hartip_body = -1;

static expert_field ei_hartip_data_none = EI_INIT;
static expert_field ei_hartip_data_unexpected = EI_INIT;

/* Command 0 response */
static int hf_hartip_pt_rsp_expansion_code = -1;
static int hf_hartip_pt_rsp_expanded_device_type = -1;
static int hf_hartip_pt_rsp_req_min_preambles = -1;
static int hf_hartip_pt_rsp_hart_protocol_major_rev = -1;
static int hf_hartip_pt_rsp_device_rev = -1;
static int hf_hartip_pt_rsp_software_rev = -1;
static int hf_hartip_pt_rsp_hardware_rev_physical_signal = -1;
static int hf_hartip_pt_rsp_flage = -1;
static int hf_hartip_pt_rsp_device_id = -1;
static int hf_hartip_pt_rsp_rsp_min_preambles = -1;
static int hf_hartip_pt_rsp_max_device_variables = -1;
static int hf_hartip_pt_rsp_configuration_change_counter = -1;
static int hf_hartip_pt_rsp_extended_device_status = -1;
static int hf_hartip_pt_rsp_manufacturer_Identification_code = -1;
static int hf_hartip_pt_rsp_private_label = -1;
static int hf_hartip_pt_rsp_device_profile = -1;

/* Command 2 response */
static int hf_hartip_pt_rsp_pv_percent_range = -1;

/* Command 3 response */
static int hf_hartip_pt_rsp_pv_loop_current = -1;
static int hf_hartip_pt_rsp_pv_units = -1;
static int hf_hartip_pt_rsp_pv = -1;
static int hf_hartip_pt_rsp_sv_units = -1;
static int hf_hartip_pt_rsp_sv = -1;
static int hf_hartip_pt_rsp_tv_units = -1;
static int hf_hartip_pt_rsp_tv = -1;
static int hf_hartip_pt_rsp_qv_units = -1;
static int hf_hartip_pt_rsp_qv = -1;

/* Command 7 response*/
static int hf_hartip_pt_rsp_loop_current_mode = -1;

/* Command 8 response*/
static int hf_hartip_pt_rsp_primary_var_classify = -1;
static int hf_hartip_pt_rsp_secondary_var_classify = -1;
static int hf_hartip_pt_rsp_tertiary_var_classify = -1;
static int hf_hartip_pt_rsp_quaternary_var_classify = -1;

/* Command 9 response */
static int hf_hartip_pt_rsp_slot0_device_var = -1;
static int hf_hartip_pt_rsp_slot0_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot0_units = -1;
static int hf_hartip_pt_rsp_slot0_device_var_value = -1;
static int hf_hartip_pt_rsp_slot0_device_var_status = -1;

static int hf_hartip_pt_rsp_slot1_device_var = -1;
static int hf_hartip_pt_rsp_slot1_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot1_units = -1;
static int hf_hartip_pt_rsp_slot1_device_var_value = -1;
static int hf_hartip_pt_rsp_slot1_device_var_status = -1;

static int hf_hartip_pt_rsp_slot2_device_var = -1;
static int hf_hartip_pt_rsp_slot2_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot2_units = -1;
static int hf_hartip_pt_rsp_slot2_device_var_value = -1;
static int hf_hartip_pt_rsp_slot2_device_var_status = -1;

static int hf_hartip_pt_rsp_slot3_device_var = -1;
static int hf_hartip_pt_rsp_slot3_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot3_units = -1;
static int hf_hartip_pt_rsp_slot3_device_var_value = -1;
static int hf_hartip_pt_rsp_slot3_device_var_status = -1;

static int hf_hartip_pt_rsp_slot4_device_var = -1;
static int hf_hartip_pt_rsp_slot4_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot4_units = -1;
static int hf_hartip_pt_rsp_slot4_device_var_value = -1;
static int hf_hartip_pt_rsp_slot4_device_var_status = -1;

static int hf_hartip_pt_rsp_slot5_device_var = -1;
static int hf_hartip_pt_rsp_slot5_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot5_units = -1;
static int hf_hartip_pt_rsp_slot5_device_var_value = -1;
static int hf_hartip_pt_rsp_slot5_device_var_status = -1;

static int hf_hartip_pt_rsp_slot6_device_var = -1;
static int hf_hartip_pt_rsp_slot6_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot6_units = -1;
static int hf_hartip_pt_rsp_slot6_device_var_value = -1;
static int hf_hartip_pt_rsp_slot6_device_var_status = -1;

static int hf_hartip_pt_rsp_slot7_device_var = -1;
static int hf_hartip_pt_rsp_slot7_device_var_classify = -1;
static int hf_hartip_pt_rsp_slot7_units = -1;
static int hf_hartip_pt_rsp_slot7_device_var_value = -1;
static int hf_hartip_pt_rsp_slot7_device_var_status = -1;

static int hf_hartip_pt_rsp_slot0_timestamp = -1;

/* Command 13 response */
static int hf_hartip_pt_rsp_packed_descriptor = -1;
static int hf_hartip_pt_rsp_day = -1;
static int hf_hartip_pt_rsp_month = -1;
static int hf_hartip_pt_rsp_year = -1;

/* Command 14 response */
static int hf_hartip_pt_rsp_transducer_serial_number = -1;
static int hf_hartip_pt_rsp_transducer_limit_min_span_units = -1;
static int hf_hartip_pt_rsp_upper_transducer_limit = -1;
static int hf_hartip_pt_rsp_lower_transducer_limit = -1;
static int hf_hartip_pt_rsp_minimum_span = -1;

/* Command 15 response */
static int hf_hartip_pt_rsp_pv_alarm_selection_code = -1;
static int hf_hartip_pt_rsp_pv_transfer_function_code = -1;
static int hf_hartip_pt_rsp_pv_upper_and_lower_range_values_units = -1;
static int hf_hartip_pt_rsp_pv_upper_range_value = -1;
static int hf_hartip_pt_rsp_pv_lower_range_value = -1;
static int hf_hartip_pt_rsp_pv_damping_value = -1;
static int hf_hartip_pt_rsp_write_protect_code = -1;
static int hf_hartip_pt_rsp_reserved = -1;
static int hf_hartip_pt_rsp_pv_analog_channel_flags = -1;

/* Command 16 and 19 response */
static int hf_hartip_pt_rsp_final_assembly_number = -1;

/* response Tag */
static int hf_hartip_pt_rsp_tag = -1;

/* response Message */
static int hf_hartip_pt_rsp_message = -1;

/* Command 48 response */
static int hf_hartip_pt_rsp_device_sp_status = -1;
static int hf_hartip_pt_rsp_device_op_mode = -1;
static int hf_hartip_pt_rsp_standardized_status_0 = -1;
static int hf_hartip_pt_rsp_standardized_status_1 = -1;
static int hf_hartip_pt_rsp_analog_channel_saturated = -1;
static int hf_hartip_pt_rsp_standardized_status_2 = -1;
static int hf_hartip_pt_rsp_standardized_status_3 = -1;
static int hf_hartip_pt_rsp_analog_channel_fixed = -1;

/* Command 77 response */
static int hf_hartip_pt_rsp_io_card = -1;
static int hf_hartip_pt_rsp_channel = -1;
static int hf_hartip_pt_rsp_embedded_cmd_delimiter = -1;
static int hf_hartip_pt_rsp_poll_address = -1;
static int hf_hartip_pt_rsp_embedded_cmd = -1;

/* Command 31 and 178 response */
static int hf_hartip_pt_rsp_number_of_commands = -1;
static int hf_hartip_pt_rsp_command_number = -1;
static int hf_hartip_pt_rsp_command_byte_count = -1;

/* Command 31, 77 and 178 response */
static int hf_hartip_pt_rsp_data = -1;

/*Command 203 response*/
static int hf_hartip_pt_rsp_index_of_first_discrete_var = -1;
static int hf_hartip_pt_rsp_number_of_discrete_vars = -1;
static int hf_hartip_pt_rsp_timestamp_for_most_recent_discrete_change = -1;

static int hf_hartip_pt_rsp_slot0_discrete_var_state = -1;
static int hf_hartip_pt_rsp_slot0_discrete_var_status = -1;

static int hf_hartip_pt_rsp_slot1_discrete_var_state = -1;
static int hf_hartip_pt_rsp_slot1_discrete_var_status = -1;

static int hf_hartip_pt_rsp_slot2_discrete_var_state = -1;
static int hf_hartip_pt_rsp_slot2_discrete_var_status = -1;

static int hf_hartip_pt_rsp_slot3_discrete_var_state = -1;
static int hf_hartip_pt_rsp_slot3_discrete_var_status = -1;

static int hf_hartip_pt_rsp_slot4_discrete_var_state = -1;
static int hf_hartip_pt_rsp_slot4_discrete_var_status = -1;

static int hf_hartip_pt_rsp_slot5_discrete_var_state = -1;
static int hf_hartip_pt_rsp_slot5_discrete_var_status = -1;

#define HARTIP_HEADER_LENGTH     8
#define HARTIP_PORT           5094

/* HARTIP header */
typedef struct _hartip_hdr {
  guint8   version;
  guint8   message_type;
  guint8   message_id;
  guint8   status;
  guint16  transaction_id;
  guint16  length;
} hartip_hdr;

/* Message IDs */
#define SESSION_INITIATE_ID       0
#define SESSION_CLOSE_ID          1
#define KEEP_ALIVE_ID             2
#define PASS_THROUGH_ID           3

/* Message types */
#define REQUEST_MSG_TYPE       0
#define RESPONSE_MSG_TYPE      1
#define PUBLISH_MSG_TYPE       2
#define ERROR_MSG_TYPE         3
#define NAK_MSG_TYPE           15

static const value_string hartip_message_id_values[] = {
  { SESSION_INITIATE_ID,     "Session Initiate" },
  { SESSION_CLOSE_ID,        "Session Close" },
  { KEEP_ALIVE_ID,           "Keep Alive" },
  { PASS_THROUGH_ID,         "Pass Through" },
  { 0, NULL }
};

static const value_string hartip_message_type_values[] = {
  { REQUEST_MSG_TYPE,        "Request" },
  { RESPONSE_MSG_TYPE,       "Response" },
  { PUBLISH_MSG_TYPE,        "Publish" },
  { ERROR_MSG_TYPE,          "Error" },
  { NAK_MSG_TYPE,            "Error" },
  { 0, NULL }
};

/* Host types */
#define SECONDARY_MASTER_TYPE    0
#define PRIMARY_MASTER_TYPE      1

static const value_string hartip_master_type_values[] = {
  { SECONDARY_MASTER_TYPE,      "Secondary Host" },
  { PRIMARY_MASTER_TYPE,        "Primary Host" },
  { 0, NULL }
};

/* Error Codes */
#define SESSION_CLOSED_ERROR                0
#define PRIMARY_SESSION_UNAVAILABLE_ERROR   1
#define SERVICE_UNAVAILABLE_ERROR           2

static const value_string hartip_error_code_values[] = {
  { SESSION_CLOSED_ERROR,              "Session closed" },
  { PRIMARY_SESSION_UNAVAILABLE_ERROR, "Primary session unavailable" },
  { SERVICE_UNAVAILABLE_ERROR,         "Service unavailable" },
  { 0, NULL }
};

/* Handle for statistics tap. */
static int hartip_tap = -1;

/* Structure used for passing data for statistics processing. */
typedef struct _hartip_tap_info {
  gint8  message_type;
  gint8  message_id;
} hartip_tap_info;

/* Names of items in statistics tree. */
static const gchar* st_str_packets   = "Total HART_IP Packets";
static const gchar* st_str_requests  = "Request Packets";
static const gchar* st_str_responses = "Response Packets";
static const gchar* st_str_publish   = "Publish Packets";
static const gchar* st_str_errors    = "Error Packets";

/* Handles of items in statistics tree. */
static int st_node_packets = -1;
static int st_node_requests = -1;
static int st_node_responses = -1;
static int st_node_publish = -1;
static int st_node_errors = -1;

static void
hartip_stats_tree_init(stats_tree* st)
{
  st_node_packets   = stats_tree_create_node(st, st_str_packets, 0, STAT_DT_INT, TRUE);
  st_node_requests  = stats_tree_create_pivot(st, st_str_requests, st_node_packets);
  st_node_responses = stats_tree_create_node(st, st_str_responses, st_node_packets, STAT_DT_INT, TRUE);
  st_node_publish   = stats_tree_create_node(st, st_str_publish, st_node_packets, STAT_DT_INT, TRUE);
  st_node_errors    = stats_tree_create_node(st, st_str_errors, st_node_packets, STAT_DT_INT, TRUE);
}

static tap_packet_status
hartip_stats_tree_packet(stats_tree* st, packet_info* pinfo _U_,
                         epan_dissect_t* edt _U_, const void* p)
{
  const hartip_tap_info *tapinfo = (const hartip_tap_info *)p;
  const gchar           *message_type_node_str, *message_id_node_str;
  int                    message_type_node;

  switch (tapinfo->message_type) {
  case REQUEST_MSG_TYPE:
    message_type_node_str = st_str_requests;
    message_type_node     = st_node_requests;
    break;
  case RESPONSE_MSG_TYPE:
    message_type_node_str = st_str_responses;
    message_type_node     = st_node_responses;
    break;
  case PUBLISH_MSG_TYPE:
    message_type_node_str = st_str_publish;
    message_type_node     = st_node_publish;
    break;
  case ERROR_MSG_TYPE:
  case NAK_MSG_TYPE:
    message_type_node_str = st_str_errors;
    message_type_node     = st_node_errors;
    break;
  default:
    return TAP_PACKET_DONT_REDRAW;  /* Don't want to track invalid messages for now. */
  }

  message_id_node_str = val_to_str(tapinfo->message_id,
                                   hartip_message_id_values,
                                   "Unknown message %d");

  tick_stat_node(st, st_str_packets, 0, FALSE);
  tick_stat_node(st, message_type_node_str, st_node_packets, FALSE);
  tick_stat_node(st, message_id_node_str, message_type_node, FALSE);

  return TAP_PACKET_REDRAW;
}

static gint
dissect_empty_body(proto_tree *tree, packet_info* pinfo, tvbuff_t *tvb,
                   gint offset, gint bodylen)
{
  proto_item  *ti;

  ti = proto_tree_add_item(tree, hf_hartip_data, tvb, offset, bodylen, ENC_NA);
  if (bodylen == 0) {
    expert_add_info(pinfo, ti, &ei_hartip_data_none);
  } else {
    expert_add_info(pinfo, ti, &ei_hartip_data_unexpected);
  }
  return bodylen;
}

static gint
dissect_session_init(proto_tree *body_tree, tvbuff_t *tvb, gint offset,
                     gint bodylen)
{
  if (bodylen == 5) {
    proto_tree_add_item(body_tree, hf_hartip_master_type, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(body_tree, hf_hartip_inactivity_close_timer, tvb, offset, 4, ENC_BIG_ENDIAN);
  } else {
    proto_tree_add_item(body_tree, hf_hartip_data, tvb, offset, bodylen, ENC_NA);
  }

  return bodylen;
}

static gint
dissect_error(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen == 1) {
    proto_tree_add_item(body_tree, hf_hartip_error_code, tvb, offset, 1, ENC_BIG_ENDIAN);
  } else {
    proto_tree_add_item(body_tree, hf_hartip_data, tvb, offset, bodylen, ENC_NA);
  }

  return bodylen;
}

static gint
dissect_session_close(proto_tree *body_tree, packet_info* pinfo, tvbuff_t *tvb,
                      gint offset, gint bodylen)
{
  return dissect_empty_body(body_tree, pinfo, tvb, offset, bodylen);
}

static gint
dissect_keep_alive(proto_tree *body_tree, packet_info* pinfo, tvbuff_t *tvb,
                   gint offset, gint bodylen)
{
  return dissect_empty_body(body_tree, pinfo, tvb, offset, bodylen);
}

static gint
dissect_byte(proto_tree *tree, int hf, tvbuff_t *tvb, gint offset)
{
  proto_tree_add_item(tree, hf, tvb, offset, 1, ENC_BIG_ENDIAN);
  return 1;
}

static gint
dissect_short(proto_tree *tree, int hf, tvbuff_t *tvb, gint offset)
{
  proto_tree_add_item(tree, hf, tvb, offset, 2, ENC_BIG_ENDIAN);
  return 2;
}

static gint
dissect_float(proto_tree *tree, int hf, tvbuff_t *tvb, gint offset)
{
  proto_tree_add_item(tree, hf, tvb, offset, 4, ENC_BIG_ENDIAN);
  return 4;
}

static gint
dissect_packAscii(proto_tree *tree, int hf, tvbuff_t *tvb, gint offset, int len)
{
  gushort     usIdx;
  gushort     usGroupCnt;
  gushort     usMaxGroups;      /* Number of 4 byte groups to pack. */
  gushort     usMask;
  gint        iIndex;
  gint        i   = 0;
  gushort     buf[4];
  guint8     *tmp;
  char       *str = NULL;

  tmp = (guint8 *)wmem_alloc0(wmem_packet_scope(), len);
  tvb_memcpy(tvb, tmp, offset, len);

  /* Maximum possible unpacked length = (len / 3) * 4 */
  str = (char *)wmem_alloc(wmem_packet_scope(), ((len / 3) * 4)+1);

  iIndex = 0;
  usMaxGroups = (gushort)(len / 3);
  for (usGroupCnt = 0; usGroupCnt < usMaxGroups; usGroupCnt++) {
    /*
     * First unpack 3 bytes into a group of 4 bytes, clearing bits 6 & 7.
     */
    buf[0] = (gushort)(tmp[iIndex] >> 2);
    buf[1] = (gushort)(((tmp[iIndex] << 4) & 0x30) | (tmp[iIndex + 1] >> 4));
    buf[2] = (gushort)(((tmp[iIndex + 1] << 2) & 0x3C) | (tmp[iIndex + 2] >> 6));
    buf[3] = (gushort)(tmp[iIndex + 2] & 0x3F);
    iIndex += 3;

    /*
     * Now transfer to unpacked area, setting bit 6 to complement of bit 5.
     */
    for (usIdx = 0; usIdx < 4; usIdx++) {
      usMask = (gushort)(((buf[usIdx] & 0x20) << 1) ^ 0x40);
      DISSECTOR_ASSERT(i < 256);
      str[i++] = (gchar)(buf[usIdx] | usMask);
    }
  }
  str[i] = '\0';

  proto_tree_add_string(tree, hf, tvb, offset, len, str);

  return len;
}

static gint
dissect_timestamp(proto_tree *tree, int hf, const char *name, int len,
                  tvbuff_t *tvb, gint offset)
{
  proto_item *ti;
  guint32     t;
  guint32     hrs  = 0;
  guint32     mins = 0;
  guint32     secs = 0;
  guint32     ms   = 0;

  ti = proto_tree_add_item(tree, hf, tvb, offset, len, ENC_NA);
  t  = tvb_get_ntohl(tvb, offset);

  if (t > 0 ) {
    t /= 32;
    ms = t % 1000;
    t /= 1000;
    secs = t % 60;
    t /= 60;
    mins = t % 60;
    hrs = (guint)(t / 60);
  }

  proto_item_set_text(ti, "%s: %02d:%02d:%02d.%03d", name, hrs, mins, secs, ms);
  return len;
}

static gint
dissect_cmd0(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 12) {
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_expansion_code,                   tvb, offset);
    offset += dissect_short(body_tree, hf_hartip_pt_rsp_expanded_device_type,             tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_req_min_preambles,                tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_hart_protocol_major_rev,          tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_device_rev,                       tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_software_rev,                     tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_hardware_rev_physical_signal,     tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_flage,                            tvb, offset);
    proto_tree_add_item(body_tree,     hf_hartip_pt_rsp_device_id,                        tvb, offset, 3, ENC_NA);
    offset += 3;

    if (bodylen >= 16) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_rsp_min_preambles,                tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_max_device_variables,             tvb, offset);
      offset += dissect_short(body_tree, hf_hartip_pt_rsp_configuration_change_counter,     tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_extended_device_status,           tvb, offset);
    }

    if (bodylen >= 18) {
      offset += dissect_short(body_tree, hf_hartip_pt_rsp_manufacturer_Identification_code, tvb, offset);
    }

    if (bodylen >= 22) {
      offset += dissect_short(body_tree, hf_hartip_pt_rsp_private_label,                    tvb, offset);
      /*offset += */dissect_byte(body_tree,  hf_hartip_pt_rsp_device_profile,                   tvb, offset);
    }

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd1(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 5) {
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_pv_units, tvb, offset);
    /*offset += */dissect_float(body_tree, hf_hartip_pt_rsp_pv,       tvb, offset);
    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd2(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 8) {
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_pv_loop_current,  tvb, offset);
    /*offset += */dissect_float(body_tree, hf_hartip_pt_rsp_pv_percent_range, tvb, offset);
    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd3(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 24) {
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_pv_loop_current, tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_pv_units,        tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_pv,              tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_sv_units,        tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_sv,              tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_tv_units,        tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_tv,              tvb, offset);
    offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_qv_units,        tvb, offset);
    /*offset += */dissect_float(body_tree, hf_hartip_pt_rsp_qv,              tvb, offset);

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd7(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 2) {
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_poll_address,     tvb, offset);
    dissect_byte(body_tree, hf_hartip_pt_rsp_loop_current_mode,          tvb, offset);

    return bodylen;
  }
   return 0;
}

static gint
dissect_cmd8(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 4) {
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_primary_var_classify,     tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_secondary_var_classify,   tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_tertiary_var_classify,    tvb, offset);
    dissect_byte(body_tree, hf_hartip_pt_rsp_quaternary_var_classify,            tvb, offset);

    return bodylen;
  }
   return 0;
}

static gint
dissect_cmd9(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 13) {
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_extended_device_status,    tvb, offset);
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot0_device_var,          tvb, offset);
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot0_device_var_classify, tvb, offset);
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot0_units,               tvb, offset);
    offset += dissect_float(body_tree,   hf_hartip_pt_rsp_slot0_device_var_value,    tvb, offset);
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot0_device_var_status,   tvb, offset);

    if (bodylen >= 21) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot1_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot1_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot1_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot1_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot1_device_var_status,   tvb, offset);
    }

    if (bodylen >= 29) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot2_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot2_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot2_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot2_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot2_device_var_status,   tvb, offset);
    }

    if (bodylen >= 37) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot3_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot3_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot3_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot3_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot3_device_var_status,   tvb, offset);
    }

    if (bodylen >= 45) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot4_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot4_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot4_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot4_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot4_device_var_status,   tvb, offset);
    }

    if (bodylen >= 53) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot5_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot5_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot5_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot5_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot5_device_var_status,   tvb, offset);
    }

    if (bodylen >= 61) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot6_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot6_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot6_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot6_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot6_device_var_status,   tvb, offset);
    }

    if (bodylen >= 69) {
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot7_device_var,          tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot7_device_var_classify, tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot7_units,               tvb, offset);
      offset += dissect_float(body_tree, hf_hartip_pt_rsp_slot7_device_var_value,    tvb, offset);
      offset += dissect_byte(body_tree,  hf_hartip_pt_rsp_slot7_device_var_status,   tvb, offset);
    }

    dissect_timestamp(body_tree, hf_hartip_pt_rsp_slot0_timestamp, "Slot0 Data TimeStamp", 4, tvb, offset);

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd13(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 21) {
    offset += dissect_packAscii(body_tree, hf_hartip_pt_rsp_tag, tvb, offset, 6);
    offset += dissect_packAscii(body_tree, hf_hartip_pt_rsp_packed_descriptor, tvb, offset, 12);
    offset += dissect_byte(body_tree,      hf_hartip_pt_rsp_day,                                 tvb, offset);
    offset += dissect_byte(body_tree,      hf_hartip_pt_rsp_month,                               tvb, offset);
    /*offset += */dissect_byte(body_tree,      hf_hartip_pt_rsp_year,                                tvb, offset);

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd14(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 16) {
    proto_tree_add_item(body_tree, hf_hartip_pt_rsp_transducer_serial_number, tvb, offset, 3, ENC_NA);
    offset += 3;
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_transducer_limit_min_span_units, tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_upper_transducer_limit,         tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_lower_transducer_limit,         tvb, offset);
    dissect_float(body_tree, hf_hartip_pt_rsp_minimum_span,                             tvb, offset);

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd15(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 18) {
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_pv_alarm_selection_code,               tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_pv_transfer_function_code,             tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_pv_upper_and_lower_range_values_units, tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_pv_upper_range_value,                 tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_pv_lower_range_value,                 tvb, offset);
    offset += dissect_float(body_tree, hf_hartip_pt_rsp_pv_damping_value,                     tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_write_protect_code,                    tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_reserved,                              tvb, offset);
    dissect_byte(body_tree, hf_hartip_pt_rsp_pv_analog_channel_flags,                         tvb, offset);

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd16(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 3) {
    proto_tree_add_item(body_tree, hf_hartip_pt_rsp_final_assembly_number, tvb, offset, 3, ENC_NA);

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd33(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 6) {
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot0_device_var,          tvb, offset);
    offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot0_units,               tvb, offset);
    offset += dissect_float(body_tree,   hf_hartip_pt_rsp_slot0_device_var_value,    tvb, offset);

    if (bodylen >= 12) {
      offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot1_device_var,        tvb, offset);
      offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot1_units,             tvb, offset);
      offset += dissect_float(body_tree,   hf_hartip_pt_rsp_slot1_device_var_value,  tvb, offset);
    }

    if (bodylen >= 18) {
      offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot2_device_var,        tvb, offset);
      offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot2_units,             tvb, offset);
      offset += dissect_float(body_tree,   hf_hartip_pt_rsp_slot2_device_var_value,  tvb, offset);
    }

    if (bodylen >= 24) {
      offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot3_device_var,        tvb, offset);
      offset += dissect_byte(body_tree,    hf_hartip_pt_rsp_slot3_units,             tvb, offset);
      dissect_float(body_tree,   hf_hartip_pt_rsp_slot3_device_var_value,            tvb, offset);
    }

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd38(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 2) {
    dissect_short(body_tree, hf_hartip_pt_rsp_configuration_change_counter, tvb, offset);

   return bodylen;
  }

  return 0;
}

static gint
dissect_cmd48(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 6) {
    proto_tree_add_item(body_tree,      hf_hartip_pt_rsp_device_sp_status,         tvb, offset, 6, ENC_NA);
    offset += 6;

    if (bodylen >= 9) {
      offset += dissect_byte(body_tree,   hf_hartip_pt_rsp_extended_device_status, tvb, offset);
      offset += dissect_byte(body_tree,   hf_hartip_pt_rsp_device_op_mode,         tvb, offset);
      offset += dissect_byte(body_tree,   hf_hartip_pt_rsp_standardized_status_0,  tvb, offset);
    }

    if (bodylen >= 13) {
      offset += dissect_byte(body_tree, hf_hartip_pt_rsp_standardized_status_1,    tvb, offset);
      offset += dissect_byte(body_tree, hf_hartip_pt_rsp_analog_channel_saturated, tvb, offset);
      offset += dissect_byte(body_tree, hf_hartip_pt_rsp_standardized_status_2,    tvb, offset);
      offset += dissect_byte(body_tree, hf_hartip_pt_rsp_standardized_status_3,    tvb, offset);
    }

    if (bodylen >= 14) {
        offset += dissect_byte(body_tree, hf_hartip_pt_rsp_analog_channel_fixed,   tvb, offset);
    }

    if (bodylen >= 24) {
      proto_tree_add_item(body_tree,    hf_hartip_pt_rsp_device_sp_status,         tvb, offset, 11, ENC_NA);
      /*offset += 11;*/
    }
    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd77(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  guint8  byte_count;
  gint    length = bodylen;

  if (length >= 6) {
     offset += dissect_byte(body_tree, hf_hartip_pt_rsp_io_card,                tvb, offset);
     offset += dissect_byte(body_tree, hf_hartip_pt_rsp_channel,                tvb, offset);
     offset += dissect_byte(body_tree, hf_hartip_pt_rsp_embedded_cmd_delimiter, tvb, offset);
     offset += dissect_byte(body_tree, hf_hartip_pt_rsp_poll_address,           tvb, offset);
     offset += dissect_byte(body_tree, hf_hartip_pt_rsp_embedded_cmd,           tvb, offset);

     byte_count = tvb_get_guint8(tvb, offset);
     proto_tree_add_item(body_tree, hf_hartip_pt_rsp_command_byte_count, tvb, offset, 1, ENC_BIG_ENDIAN);
     offset += 1;
     length -= 6;

     if ((byte_count >= 2) && (length >= 2) && (byte_count <= length)) {
       offset += dissect_byte(body_tree, hf_hartip_pt_response_code, tvb, offset);
       offset += dissect_byte(body_tree, hf_hartip_pt_device_status, tvb, offset);
       length -= 2;
       byte_count -= 2;

       if ((byte_count > 0) && (length > 0) && (byte_count <= length)) {
         proto_tree_add_item(body_tree, hf_hartip_pt_rsp_data, tvb, offset,
                             byte_count, ENC_NA);
       }
     }

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd178(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
   guint16 cmd;
   guint8  number_of_cmds;
   guint8  cmd_byte_count;
   gint    length = bodylen;
   gint8   i;
   gint    result;

   if (length >= 5) {
     number_of_cmds = tvb_get_guint8(tvb, offset);
     proto_tree_add_uint(body_tree, hf_hartip_pt_rsp_number_of_commands, tvb, offset, 1, number_of_cmds);
     offset += 1;
     length -= 1;

     for (i = 0; i < number_of_cmds; i++)
     {
       if (length >= 4)
       {
         cmd = tvb_get_ntohs(tvb, offset);
         proto_tree_add_item(body_tree, hf_hartip_pt_rsp_command_number, tvb, offset, 2, ENC_BIG_ENDIAN);
         offset += 2;
         length -= 2;

         cmd_byte_count = tvb_get_guint8(tvb, offset);
         proto_tree_add_item(body_tree, hf_hartip_pt_rsp_command_byte_count, tvb, offset, 1, ENC_BIG_ENDIAN);
         offset += 1;
         length -= 1;

         offset += dissect_byte(body_tree, hf_hartip_pt_response_code, tvb, offset);
         length -= 1;
         cmd_byte_count -= 1;

         if ((cmd_byte_count > 0) && (length > 0) && (cmd_byte_count <= length))
         {
           switch(cmd)
           {
             case 3:
               result = dissect_cmd3(body_tree, tvb, offset, cmd_byte_count);
               break;
             case 9:
               result = dissect_cmd9(body_tree, tvb, offset, cmd_byte_count);
               break;
             case 48:
               result = dissect_cmd48(body_tree, tvb, offset, cmd_byte_count);
               break;
             default:
               result = 0;
               break;
           }

           if (result == 0 ) {
             proto_tree_add_item(body_tree, hf_hartip_pt_rsp_data, tvb, offset,
                                 cmd_byte_count, ENC_NA);
           }

           offset += cmd_byte_count;
           length -= cmd_byte_count;
         }
       } else {
         return bodylen;
       }
     }

     return bodylen;
   }

   return 0;
}

static gint
dissect_cmd203(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  if (bodylen >= 8) {
    offset += dissect_short(body_tree, hf_hartip_pt_rsp_index_of_first_discrete_var, tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_number_of_discrete_vars,      tvb, offset);
    offset += dissect_byte(body_tree, hf_hartip_pt_rsp_extended_device_status,       tvb, offset);
    dissect_timestamp(body_tree, hf_hartip_pt_rsp_timestamp_for_most_recent_discrete_change,
                      "TimeStamp for Most Recent Discrete Change", 4,                tvb, offset);
    offset += 4;

    if (bodylen >= 11)
    {
       offset += dissect_short(body_tree, hf_hartip_pt_rsp_slot0_discrete_var_state, tvb, offset);
       offset += dissect_byte(body_tree, hf_hartip_pt_rsp_slot0_discrete_var_status, tvb, offset);
    }

    if (bodylen >= 14)
    {
       offset += dissect_short(body_tree, hf_hartip_pt_rsp_slot1_discrete_var_state, tvb, offset);
       offset += dissect_byte(body_tree, hf_hartip_pt_rsp_slot1_discrete_var_status, tvb, offset);
    }

    if (bodylen >= 17)
    {
       offset += dissect_short(body_tree, hf_hartip_pt_rsp_slot2_discrete_var_state, tvb, offset);
       offset += dissect_byte(body_tree, hf_hartip_pt_rsp_slot2_discrete_var_status, tvb, offset);
    }

    if (bodylen >= 20)
    {
       offset += dissect_short(body_tree, hf_hartip_pt_rsp_slot3_discrete_var_state, tvb, offset);
       offset += dissect_byte(body_tree, hf_hartip_pt_rsp_slot3_discrete_var_status, tvb, offset);
    }

    if (bodylen >= 23)
    {
       offset += dissect_short(body_tree, hf_hartip_pt_rsp_slot4_discrete_var_state, tvb, offset);
       offset += dissect_byte(body_tree, hf_hartip_pt_rsp_slot4_discrete_var_status, tvb, offset);
    }

    if (bodylen >= 26)
    {
       offset += dissect_short(body_tree, hf_hartip_pt_rsp_slot5_discrete_var_state, tvb, offset);
       dissect_byte(body_tree, hf_hartip_pt_rsp_slot5_discrete_var_status,           tvb, offset);
    }

    return bodylen;
  }

  return 0;
}

static gint
dissect_cmd31(proto_tree *body_tree, tvbuff_t *tvb, gint offset, gint bodylen)
{
  gint    length = bodylen;
  gint    result = 0;
  guint16 cmd;

  if (length >= 2) {
    cmd = tvb_get_ntohs(tvb, offset);
    proto_tree_add_item(body_tree, hf_hartip_pt_rsp_command_number, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;
    length -= 2;

    if (length > 0) {
      switch(cmd)
      {
        case 64386:
          result = dissect_cmd203(body_tree, tvb, offset, length);
          break;
      }

      if (result == 0) {
        proto_tree_add_item(body_tree, hf_hartip_pt_rsp_data, tvb, offset,
                            length, ENC_NA);
      }
    }

    return bodylen;
  }

  return 0;
}

static gint
dissect_parse_hart_cmds(proto_tree *body_tree, tvbuff_t *tvb, guint8 cmd,
                        gint offset, gint bodylen)
{
  switch(cmd)
  {
  case 0:
  case 11:
  case 21:
    return dissect_cmd0(body_tree, tvb, offset, bodylen);
  case 1:
    return dissect_cmd1(body_tree, tvb, offset, bodylen);
  case 2:
    return dissect_cmd2(body_tree, tvb, offset, bodylen);
  case 3:
    return dissect_cmd3(body_tree, tvb, offset, bodylen);
  case 6:
  case 7:
    return dissect_cmd7(body_tree, tvb, offset, bodylen);
  case 8:
    return dissect_cmd8(body_tree, tvb, offset, bodylen);
  case 9:
    return dissect_cmd9(body_tree, tvb, offset, bodylen);
  case 12:
  case 17:
    if (bodylen >= 24)
      return dissect_packAscii(body_tree, hf_hartip_pt_rsp_message, tvb, offset, 24);
    break;
  case 13:
  case 18:
    return dissect_cmd13(body_tree, tvb, offset, bodylen);
  case 14:
    return dissect_cmd14(body_tree, tvb, offset, bodylen);
  case 15:
    return dissect_cmd15(body_tree, tvb, offset, bodylen);
  case 16:
  case 19:
    return dissect_cmd16(body_tree, tvb, offset, bodylen);
  case 20:
  case 22:
    if (bodylen >= 32) {
      proto_tree_add_item(body_tree, hf_hartip_pt_rsp_tag, tvb, offset, 32,
                          ENC_ASCII|ENC_NA);
      return 32;
    }
    break;
  case 31:
    return dissect_cmd31(body_tree, tvb, offset, bodylen);
  case 33:
    return dissect_cmd33(body_tree, tvb, offset, bodylen);
  case 38:
    return dissect_cmd38(body_tree, tvb, offset, bodylen);
  case 48:
    return dissect_cmd48(body_tree, tvb, offset, bodylen);
  case 77:
    return dissect_cmd77(body_tree, tvb, offset, bodylen);
  case 178:
    return dissect_cmd178(body_tree, tvb, offset, bodylen);
  case 203:
    return dissect_cmd203(body_tree, tvb, offset, bodylen);
  }

  return 0;
}

static gint
dissect_pass_through(proto_tree *body_tree, tvbuff_t *tvb, gint offset,
                     gint bodylen)
{
  proto_item *ti;
  guint8      delimiter;
  const char *frame_type_str;
  guint8      cmd           = 0;
  gint        length        = bodylen;
  gint        is_short      = 0;
  gint        is_rsp        = 0;
  gint        num_preambles = 0;
  gint        result;
  guint8      short_addr;

  /* find number of preambles */
  while (length > num_preambles) {
    delimiter = tvb_get_guint8(tvb, offset + num_preambles);
    if (delimiter != 0xFF)
      break;

    num_preambles += 1;
  }

  if (num_preambles > 0) {
    proto_tree_add_item(body_tree, hf_hartip_pt_preambles, tvb, offset,
                        num_preambles, ENC_NA);
    offset += num_preambles;
    length -= num_preambles;
  }

  if (length > 0) {
    delimiter = tvb_get_guint8(tvb, offset);
    ti = proto_tree_add_uint(body_tree, hf_hartip_pt_delimiter, tvb, offset, 1,
                             delimiter);
    offset += 1;
    length -= 1;

    if ((delimiter & 0x7) == 2) {
      frame_type_str = "STX";
    } else if ((delimiter & 0x7) == 6) {
      frame_type_str = "ACK";
      is_rsp = 1;
    } else if ((delimiter & 0x7) == 1) {
      frame_type_str = "PUB";
      is_rsp = 1;
    } else {
      frame_type_str = "UNK";
    }

    if ((delimiter & 0x80) == 0) {
      is_short = 1;
      proto_item_set_text(ti, "Short Address, Frame Type: %s", frame_type_str);
    } else {
      proto_item_set_text(ti, "Frame Type: %s", frame_type_str);
    }
  }

  if (is_short == 1) {
    if (length > 0) {
      short_addr = tvb_get_guint8(tvb, offset);
      short_addr = short_addr & 0x3F;
      proto_tree_add_uint(body_tree, hf_hartip_pt_short_addr, tvb, offset, 1,
                               short_addr);
      offset += 1;
      length -= 1;
    }
  } else {
    if (length > 4) {
      proto_tree_add_item(body_tree, hf_hartip_pt_long_addr, tvb, offset, 5, ENC_NA);
      offset += 5;
      length -= 5;
    } else if (length > 0) {
      proto_tree_add_item(body_tree, hf_hartip_data, tvb, offset, length, ENC_NA);
      length = 0;
    }
  }

  if (length > 0) {
    cmd = tvb_get_guint8(tvb, offset);
    proto_tree_add_item(body_tree, hf_hartip_pt_command, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    length -= 1;
  }
  if (length > 0) {
    proto_tree_add_item(body_tree, hf_hartip_pt_length, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;
    length -= 1;
  }

  if (is_rsp == 1) {
    if (length > 0) {
      proto_tree_add_item(body_tree, hf_hartip_pt_response_code, tvb, offset, 1, ENC_BIG_ENDIAN);
      offset += 1;
      length -= 1;
    }
    if (length > 0) {
      proto_tree_add_item(body_tree, hf_hartip_pt_device_status, tvb, offset, 1, ENC_BIG_ENDIAN);
      offset += 1;
      length -= 1;
    }
  }

  if (length > 1) {
    result = dissect_parse_hart_cmds(body_tree, tvb, cmd, offset, (length - 1));
    if (result == 0 ) {
      proto_tree_add_item(body_tree, hf_hartip_pt_payload, tvb, offset,
                          (length - 1), ENC_NA);
    }
    offset += (length - 1);
    length = 1;
  }
  if (length > 0) {
    proto_tree_add_checksum(body_tree, tvb, offset, hf_hartip_pt_checksum, -1, NULL, NULL, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
  }

  return bodylen;
}

static void
hartip_set_conversation(packet_info *pinfo)
{
  conversation_t *conversation = NULL;

  if (!pinfo->fd->visited && (pinfo->ptype == PT_UDP)) {
    /*
     * This function is called for a session initiate send over UDP.
     * The session initiate is sent to the server on port HARTIP_PORT.
     * The server then responds from a different port.  All subsequent
     * communication for the session between the client and server
     * uses the new server port and the original client port.
     *
     * A new conversation is created here and this dissector is set to
     * be used for it.  This allows the packets to be dissected properly
     * for this protocol.
     */
    conversation = find_conversation(pinfo->num,
                                     &pinfo->src, &pinfo->dst, conversation_pt_to_endpoint_type(pinfo->ptype),
                                     pinfo->srcport, 0, NO_PORT_B);
    if( (conversation == NULL) ||
        (conversation_get_dissector(conversation, pinfo->num) != hartip_udp_handle) ) {
      conversation = conversation_new(pinfo->num,
                                      &pinfo->src, &pinfo->dst, conversation_pt_to_endpoint_type(pinfo->ptype),
                                      pinfo->srcport, 0, NO_PORT2);
      conversation_set_dissector(conversation, hartip_udp_handle);
    }
  }
}

static int
dissect_hartip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
                      gint offset)
{
  proto_tree      *hartip_tree, *hdr_tree, *body_tree;
  proto_item      *hart_item;
  gint             bodylen;
  guint8           message_type, message_id;
  guint16          transaction_id, length;
  const char      *msg_id_str, *msg_type_str;
  hartip_tap_info *tapinfo;

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "HART_IP");
  col_clear(pinfo->cinfo, COL_INFO);

  length  = tvb_get_ntohs(tvb, offset+6);

  hart_item = proto_tree_add_item(tree, proto_hartip, tvb, 0, length, ENC_NA);
  hartip_tree = proto_item_add_subtree(hart_item, ett_hartip);

  hdr_tree = proto_tree_add_subtree(hartip_tree, tvb, offset, HARTIP_HEADER_LENGTH,
                      ett_hartip_hdr, NULL, "HART_IP Header");

  proto_tree_add_item(hdr_tree, hf_hartip_hdr_version, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;

  message_type = tvb_get_guint8(tvb, offset);
  msg_type_str = val_to_str(message_type, hartip_message_type_values, "Unknown message type %d");
  proto_tree_add_item(hdr_tree, hf_hartip_hdr_message_type, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;

  message_id = tvb_get_guint8(tvb, offset);
  msg_id_str = val_to_str(message_id, hartip_message_id_values, "Unknown message %d");
  proto_tree_add_item(hdr_tree, hf_hartip_hdr_message_id, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;

  /* Setup statistics for tap. */
  tapinfo = wmem_new(wmem_packet_scope(), hartip_tap_info);
  tapinfo->message_type = message_type;
  tapinfo->message_id   = message_id;
  tap_queue_packet(hartip_tap, pinfo, tapinfo);

  if (message_id == SESSION_INITIATE_ID) {
    hartip_set_conversation(pinfo);
  }

  proto_tree_add_item(hdr_tree, hf_hartip_hdr_status, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;

  transaction_id = tvb_get_ntohs(tvb, offset);
  proto_tree_add_item(hdr_tree, hf_hartip_hdr_transaction_id, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;

  proto_item_append_text(hart_item, ", %s %s, Sequence Number %d", msg_id_str,
                         msg_type_str, transaction_id);

  col_append_sep_fstr(pinfo->cinfo, COL_INFO, " | ",
                      "%s %s, Sequence Number %d",
                      msg_id_str, msg_type_str, transaction_id);
  col_set_fence(pinfo->cinfo, COL_INFO);

  proto_tree_add_item(hdr_tree, hf_hartip_hdr_msg_length, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;

  if (length < HARTIP_HEADER_LENGTH)
    return tvb_reported_length(tvb);
  bodylen = length - HARTIP_HEADER_LENGTH;

  /* add body elements. */
  body_tree = proto_tree_add_subtree_format(hartip_tree, tvb, offset, bodylen,
                           ett_hartip_body, NULL,
                           "HART_IP Body, %s, %s", msg_id_str, msg_type_str);

  if ((message_type == ERROR_MSG_TYPE) ||
      (message_type == NAK_MSG_TYPE)) {
    offset += dissect_error(body_tree, tvb, offset, bodylen);
  } else {
    /*  Dissect the various HARTIP messages. */
    switch(message_id) {
    case SESSION_INITIATE_ID:
      offset += dissect_session_init(body_tree, tvb, offset, bodylen);
      break;
    case SESSION_CLOSE_ID:
      offset += dissect_session_close(body_tree, pinfo, tvb, offset, bodylen);
      break;
    case KEEP_ALIVE_ID:
      offset += dissect_keep_alive(body_tree, pinfo, tvb, offset, bodylen);
      break;
    case PASS_THROUGH_ID:
      offset += dissect_pass_through(body_tree, tvb, offset, bodylen);
      break;
    default:
      proto_tree_add_item(body_tree, hf_hartip_data, tvb, offset, bodylen, ENC_NA);
      offset += bodylen;
      break;
    }
  }

  return offset;
}

static guint
get_dissect_hartip_len(packet_info *pinfo _U_, tvbuff_t *tvb,
                       int offset, void *data _U_)
{
  return tvb_get_ntohs(tvb, offset+6);
}

static int
dissect_hartip_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
  return dissect_hartip_common(tvb, pinfo, tree, 0);
}

static int
dissect_hartip_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
                   void *data)
{
  /* Simple hueristic check*/
  const gchar * msg_str = try_val_to_str(tvb_get_guint8(tvb, 1), hartip_message_type_values);
  if (!msg_str) {
    return 0;
  }

  msg_str = try_val_to_str(tvb_get_guint8(tvb, 2), hartip_message_id_values);
  if (!msg_str) {
    return 0;
  }

  tcp_dissect_pdus(tvb, pinfo, tree, hartip_desegment, HARTIP_HEADER_LENGTH,
                   get_dissect_hartip_len, dissect_hartip_pdu, data);
  return tvb_reported_length(tvb);
}

static int
dissect_hartip_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
                   void *data _U_)
{
  gint offset = 0;

  /* Simple hueristic check*/
  const gchar * msg_str = try_val_to_str(tvb_get_guint8(tvb, 1), hartip_message_type_values);
  if (!msg_str) {
    return 0;
  }

  msg_str = try_val_to_str(tvb_get_guint8(tvb, 2), hartip_message_id_values);
  if (!msg_str) {
    return 0;
  }

  while (tvb_reported_length_remaining(tvb, offset) >= HARTIP_HEADER_LENGTH)
    offset += dissect_hartip_common(tvb, pinfo, tree, offset);

  return offset;
}

void
proto_register_hartip(void)
{
  static hf_register_info hf[] = {
    /* HARTIP header elements. */
    { &hf_hartip_hdr_version,
      { "Version",           "hart_ip.version",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        "HART_IP version number", HFILL }
    },
    { &hf_hartip_hdr_message_type,
      { "Message Type",           "hart_ip.message_type",
        FT_UINT8, BASE_DEC, VALS(hartip_message_type_values), 0,
        "HART_IP message type", HFILL }
    },
    { &hf_hartip_hdr_message_id,
      { "Message ID",           "hart_ip.message_id",
        FT_UINT8, BASE_DEC, VALS(hartip_message_id_values), 0,
        "HART_IP message id", HFILL }
    },
    { &hf_hartip_hdr_status,
      { "Status",           "hart_ip.status",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        "HART_IP status field", HFILL }
    },
    { &hf_hartip_hdr_transaction_id,
      { "Sequence Number",           "hart_ip.transaction_id",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        "HART_IP Sequence Number", HFILL }
    },
    { &hf_hartip_hdr_msg_length,
      { "Message Length",           "hart_ip.msg_length",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        "HART_IP Message Length", HFILL }
    },

    /* HARTIP Body elements   */
    { &hf_hartip_data,
      { "Message Data",           "hart_ip.data",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        "HART_IP Message Data", HFILL }
    },
    { &hf_hartip_master_type,
      { "Host Type",           "hart_ip.session_init.master_type",
        FT_UINT8, BASE_DEC, VALS(hartip_master_type_values), 0xFF,
        "Session Host Type", HFILL }
    },
    { &hf_hartip_inactivity_close_timer,
      { "Inactivity Close Timer",           "hart_ip.session_init.inactivity_close_timer",
        FT_UINT32, BASE_DEC, NULL, 0x0,
        "Session Inactivity Close Timer", HFILL }
    },
    { &hf_hartip_error_code,
      { "Error",           "hart_ip.error.error_code",
        FT_UINT8, BASE_DEC, VALS(hartip_error_code_values), 0xFF,
        "Error Code", HFILL }
    },

    /* HARTIP Pass-through commads. */
    { &hf_hartip_pt_preambles,
      { "Preambles",           "hart_ip.pt.preambles",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        "Pass Through Preambles", HFILL }
    },
    { &hf_hartip_pt_delimiter,
      { "Delimter",           "hart_ip.pt.delimter",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        "Pass Through Delimiter", HFILL }
    },
    { &hf_hartip_pt_short_addr,
      { "Short Address",           "hart_ip.pt.short_addr",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        "Pass Through Short Address", HFILL }
    },
    { &hf_hartip_pt_long_addr,
      { "Long Address",           "hart_ip.pt.long_address",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        "Pass Through Long Address", HFILL }
    },
    { &hf_hartip_pt_command,
      { "Command",           "hart_ip.pt.command",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        "Pass Through Command", HFILL }
    },
    { &hf_hartip_pt_length,
      { "Length",           "hart_ip.pt.length",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        "Pass Through Length", HFILL }
    },
    { &hf_hartip_pt_response_code,
      { "Response Code",           "hart_ip.pt.response_code",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        "Pass Through Response Code", HFILL }
    },
    { &hf_hartip_pt_device_status,
      { "Device Status",           "hart_ip.pt.device_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        "Pass Through Device Status", HFILL }
    },
    { &hf_hartip_pt_payload,
      { "Payload",           "hart_ip.pt.payload",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        "Pass Through Payload", HFILL }
    },
    { &hf_hartip_pt_checksum,
      { "Checksum",           "hart_ip.pt.checksum",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        "Pass Through Checksum", HFILL }
    },

    /* add fields for universal commands. */
    /* command 0 */
    { &hf_hartip_pt_rsp_expansion_code,
      { "Expansion Code",           "hart_ip.pt.rsp.expansion_code",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_expanded_device_type,
      { "Expanded Device Type",           "hart_ip.pt.rsp.expanded_device_type",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_req_min_preambles,
      { "Minimum Number of Request Preambles",           "hart_ip.pt.rsp.req_min_preambles",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_hart_protocol_major_rev,
      { "HART Universal Revision",           "hart_ip.pt.rsp.hart_univ_rev",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_device_rev,
      { "Device Revision",           "hart_ip.pt.rsp.device_rev",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_software_rev,
      { "Device Software Revision",           "hart_ip.pt.rsp.software_rev",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_hardware_rev_physical_signal,
      { "Hardware Rev and Physical Signaling",           "hart_ip.pt.rsp.hardrev_and_physical_signal",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_flage,
      { "Flags",           "hart_ip.pt.rsp.flags",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_device_id,
      { "Device ID",           "hart_ip.pt.rsp.device_id",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_rsp_min_preambles,
      { "Minimum Number of Response Preambles",           "hart_ip.pt.rsp.rsp_min_preambles",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_max_device_variables,
      { "Maximum Number of Device Variables",           "hart_ip.pt.rsp.device_variables",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_configuration_change_counter,
      { "Configuration Change Counter",           "hart_ip.pt.rsp.configure_change",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_extended_device_status,
      { "Extended Device Status",           "hart_ip.pt.rsp.ext_device_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_manufacturer_Identification_code,
      { "Manufacturer ID",           "hart_ip.pt.rsp.manufacturer_Id",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_private_label,
      { "Private Label",           "hart_ip.pt.rsp.private_label",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_device_profile,
      { "Device Profile",           "hart_ip.pt.rsp.device_profile",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 2 */
    { &hf_hartip_pt_rsp_pv_percent_range,
      { "PV Percent Range",           "hart_ip.pt.rsp.pv_percent_range",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 3 */
    { &hf_hartip_pt_rsp_pv_loop_current,
      { "PV Loop Current",           "hart_ip.pt.rsp.pv_loop_current",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_units,
      { "PV Units",           "hart_ip.pt.rsp.pv_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv,
      { "PV",           "hart_ip.pt.rsp.pv",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_sv_units,
      { "SV Units",           "hart_ip.pt.rsp.sv_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_sv,
      { "SV",           "hart_ip.pt.rsp.sv",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_tv_units,
      { "TV Units",           "hart_ip.pt.rsp.tv_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_tv,
      { "TV",           "hart_ip.pt.rsp.tv",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_qv_units,
      { "QV Units",           "hart_ip.pt.rsp.qv_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_qv,
      { "QV",           "hart_ip.pt.rsp.qv",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 7 */
    { &hf_hartip_pt_rsp_loop_current_mode,
      { "Loop Current Mode",                     "hart_ip.pt.rsp.loop_current_mode",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 8 */
    { &hf_hartip_pt_rsp_primary_var_classify,
      { "Primary Variable Classification",       "hart_ip.pt.rsp.primary_variable_classification",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_secondary_var_classify,
      { "Secondary Variable Classification",     "hart_ip.pt.rsp.secondary_variable_classification",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_tertiary_var_classify,
      { "Tertiary Variable Classification",      "hart_ip.pt.rsp.tertiary_variable_classification",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_quaternary_var_classify,
      { "Quaternary Variable Classification",    "hart_ip.pt.rsp.quaternary_variable_classification",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 9 */
    { &hf_hartip_pt_rsp_slot0_device_var,
      { "Slot0 Device Variable",           "hart_ip.pt.rsp.slot0_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_device_var_classify,
      { "Slot0 Device Variable Classification",  "hart_ip.pt.rsp.slot0_device_var_classification",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_units,
      { "Slot0 Units",           "hart_ip.pt.rsp.slot0_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_device_var_value,
      { "Slot0 Device Variable Value",           "hart_ip.pt.rsp.slot0_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_device_var_status,
      { "Slot0 Device Variable Status",           "hart_ip.pt.rsp.slot0_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_device_var,
      { "Slot1 Device Variable",           "hart_ip.pt.rsp.slot1_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_device_var_classify,
      { "Slot1 Device Variable Classification",           "hart_ip.pt.rsp.slot1_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_units,
      { "Slot1 Units",           "hart_ip.pt.rsp.slot1_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_device_var_value,
      { "Slot1 Device Variable Value",           "hart_ip.pt.rsp.slot1_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_device_var_status,
      { "Slot1 Device Variable Status",           "hart_ip.pt.rsp.slot1_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_device_var,
      { "Slot2 Device Variable",           "hart_ip.pt.rsp.slot2_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_device_var_classify,
      { "Slot2 Device Variable Classification",           "hart_ip.pt.rsp.slot2_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_units,
      { "Slot2 Units",           "hart_ip.pt.rsp.slot2_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_device_var_value,
      { "Slot2 Device Variable Value",           "hart_ip.pt.rsp.slot2_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_device_var_status,
      { "Slot2 Device Variable Status",           "hart_ip.pt.rsp.slot2_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_device_var,
      { "Slot3 Device Variable",           "hart_ip.pt.rsp.slot3_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_device_var_classify,
      { "Slot3 Device Variable Classification",           "hart_ip.pt.rsp.slot3_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_units,
      { "Slot3 Units",           "hart_ip.pt.rsp.slot3_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_device_var_value,
      { "Slot3 Device Variable Value",           "hart_ip.pt.rsp.slot3_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_device_var_status,
      { "Slot3 Device Variable Status",           "hart_ip.pt.rsp.slot3_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_device_var,
      { "Slot4 Device Variable",           "hart_ip.pt.rsp.slot4_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_device_var_classify,
      { "Slot4 Device Variable Classification",           "hart_ip.pt.rsp.slot4_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_units,
      { "Slot4 Units",           "hart_ip.pt.rsp.slot4_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_device_var_value,
      { "Slot4 Device Variable Value",           "hart_ip.pt.rsp.slot4_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_device_var_status,
      { "Slot4 Device Variable Status",           "hart_ip.pt.rsp.slot4_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_device_var,
      { "Slot5 Device Variable",           "hart_ip.pt.rsp.slot5_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_device_var_classify,
      { "Slot5 Device Variable Classification",           "hart_ip.pt.rsp.slot5_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_units,
      { "Slot5 Units",           "hart_ip.pt.rsp.slot5_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_device_var_value,
      { "Slot5 Device Variable Value",           "hart_ip.pt.rsp.slot5_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_device_var_status,
      { "Slot5 Device Variable Status",           "hart_ip.pt.rsp.slot5_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot6_device_var,
      { "Slot6 Device Variable",           "hart_ip.pt.rsp.slot6_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot6_device_var_classify,
      { "Slot6 Device Variable Classification",           "hart_ip.pt.rsp.slot6_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot6_units,
      { "Slot6 Units",           "hart_ip.pt.rsp.slot6_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot6_device_var_value,
      { "Slot6 Device Variable Value",           "hart_ip.pt.rsp.slot6_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot6_device_var_status,
      { "Slot6 Device Variable Status",           "hart_ip.pt.rsp.slot6_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot7_device_var,
      { "Slot7 Device Variable",           "hart_ip.pt.rsp.slot7_device_var",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot7_device_var_classify,
      { "Slot7 Device Variable Classification",           "hart_ip.pt.rsp.slot7_device_var_classify",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot7_units,
      { "Slot7 Units",           "hart_ip.pt.rsp.slot7_units",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot7_device_var_value,
      { "Slot7 Device Variable Value",           "hart_ip.pt.rsp.slot7_device_var_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot7_device_var_status,
      { "Slot7 Device Variable Status",           "hart_ip.pt.rsp.slot7_device_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_timestamp,
      { "Slot0 Data TimeStamp",           "hart_ip.pt.rsp.slot0_data_timestamp",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 13 */
    { &hf_hartip_pt_rsp_packed_descriptor,
      { "Descriptor",           "hart_ip.pt.rsp.descriptor",
        FT_STRINGZPAD, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_day,
      { "Day",           "hart_ip.pt.rsp.day",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_month,
      { "Month",           "hart_ip.pt.rsp.month",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_year,
      { "Year",           "hart_ip.pt.rsp.year",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 14 */
    { &hf_hartip_pt_rsp_transducer_serial_number,
      { "Transducer Serail Number",              "hart_ip.pt.rsp.transducer_serail_number",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_transducer_limit_min_span_units,
      { "Transducer Limit Min Span Units",  "hart_ip.pt.rsp.transducer_limit_min_span_units",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_upper_transducer_limit,
      { "Upper Transducer Limit",                "hart_ip.pt.rsp.upper_transducer_limit",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_lower_transducer_limit,
      { "Lower Transducer Limit",                "hart_ip.pt.rsp.lower_transducer_limit",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_minimum_span,
      { "Minimum Span",                          "hart_ip.pt.rsp.minimum_span",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 15 */
    { &hf_hartip_pt_rsp_pv_alarm_selection_code,
      { "PV Alarm Selection Code",                     "hart_ip.pt.rsp.pv_alarm_selection_code",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_transfer_function_code,
      { "PV Transfer Function Code",                   "hart_ip.pt.rsp.pv_transfer_function_code",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_upper_and_lower_range_values_units,
      { "PV Upper and Lower Range Values Units",  "hart_ip.pt.rsp.pv_upper_and_lower_range_values_units",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_upper_range_value,
      { "PV Upper Range Value",                        "hart_ip.pt.rsp.pv_upper_range_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_lower_range_value,
      { "PV Lower Range Value",                        "hart_ip.pt.rsp.pv_lower_range_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_damping_value,
      { "PV Damping Value",                            "hart_ip.pt.rsp.pv_damping_value",
        FT_FLOAT, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_write_protect_code,
      { "Write Protect Code",                          "hart_ip.pt.rsp.write_protect_code",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_reserved,
      { "Reserved",                                    "hart_ip.pt.rsp.reserved",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_pv_analog_channel_flags,
      { "PV Analog Channel Flags",                     "hart_ip.pt.rsp.pv_analog_channel_flags",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 16 and 19 */
    { &hf_hartip_pt_rsp_final_assembly_number,
      { "Final Assembly Number",                       "hart_ip.pt.rsp.final_assembly_numbe",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* Tag */
    { &hf_hartip_pt_rsp_tag,
      { "Tag",           "hart_ip.pt.rsp.tag",
        FT_STRINGZPAD, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* Message */
    { &hf_hartip_pt_rsp_message,
      { "Message",           "hart_ip.pt.rsp.message",
        FT_STRINGZPAD, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 48 */
    { &hf_hartip_pt_rsp_device_sp_status,
      { "Device-Specific Status",           "hart_ip.pt.rsp.device_sp_status",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_device_op_mode,
      { "Device Operating Mode",           "hart_ip.pt.rsp.device_op_mode",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_standardized_status_0,
      { "Standardized Status 0",           "hart_ip.pt.rsp.standardized_status_0",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_standardized_status_1,
      { "Standardized Status 1",           "hart_ip.pt.rsp.standardized_status_1",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_analog_channel_saturated,
      { "Analog Channel Saturated",           "hart_ip.pt.rsp.analog_channel_saturated",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_standardized_status_2,
      { "Standardized Status 2",           "hart_ip.pt.rsp.standardized_status_2",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_standardized_status_3,
      { "Standardized Status 3",           "hart_ip.pt.rsp.standardized_status_3",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_analog_channel_fixed,
      { "Analog Channel Fixed",           "hart_ip.pt.rsp.analog_channel_fixed",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 77 */
    { &hf_hartip_pt_rsp_io_card,
      { "IO Card",                     "hart_ip.pt.rsp.io_card",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_channel,
      { "Channel",                     "hart_ip.pt.rsp.channel",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_embedded_cmd_delimiter,
      { "Embedded Command Delimter",   "hart_ip.pt.rsp.embedded_command_delimter",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_poll_address,
      { "Poll Address",                "hart_ip.pt.rsp.poll_address",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_embedded_cmd,
      { "Embedded Command",            "hart_ip.pt.rsp.embedded_command",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 178 */
    { &hf_hartip_pt_rsp_number_of_commands,
      { "Number of Commands",          "hart_ip.pt.rsp.number_of_commands",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    /* command 31 and 178 */
    { &hf_hartip_pt_rsp_command_number,
      { "Command number",              "hart_ip.pt.rsp.command_number",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_data,
      { "Data",                        "hart_ip.pt.rsp.data",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    /* command 77 and 178 */
    { &hf_hartip_pt_rsp_command_byte_count,
      { "Command byte count",          "hart_ip.pt.rsp.command_byte_count",
        FT_UINT8, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },

    /* command 203 */
    { &hf_hartip_pt_rsp_index_of_first_discrete_var,
      { "Index of First Discrete Variable",           "hart_ip.pt.rsp.index_of_first_discrete_var",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_number_of_discrete_vars,
      { "Number of Discrete Variables",               "hart_ip.pt.rsp.number_of_discrete_vars",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_timestamp_for_most_recent_discrete_change,
      { "TimeStamp for Most Recent Discrete Change",  "hart_ip.pt.rsp.timestamp_for_most_recent_discrete_change",
        FT_BYTES, BASE_NONE, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_discrete_var_state,
      { "Slot0 Discrete Variable State",              "hart_ip.pt.rsp.slot0_discrete_var_state",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot0_discrete_var_status,
      { "Slot0 Discrete Variable Status",             "hart_ip.pt.rsp.slot0_discrete_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_discrete_var_state,
      { "Slot1 Discrete Variable State",              "hart_ip.pt.rsp.slot1_discrete_var_state",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot1_discrete_var_status,
      { "Slot1 Discrete Variable Status",             "hart_ip.pt.rsp.slot1_discrete_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_discrete_var_state,
      { "Slot2 Discrete Variable State",              "hart_ip.pt.rsp.slot2_discrete_var_state",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot2_discrete_var_status,
      { "Slot2 Discrete Variable Status",             "hart_ip.pt.rsp.slot2_discrete_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_discrete_var_state,
      { "Slot3 Discrete Variable State",              "hart_ip.pt.rsp.slot3_discrete_var_state",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot3_discrete_var_status,
      { "Slot3 Discrete Variable Status",             "hart_ip.pt.rsp.slot3_discrete_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_discrete_var_state,
      { "Slot4 Discrete Variable State",              "hart_ip.pt.rsp.slot4_discrete_var_state",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot4_discrete_var_status,
      { "Slot4 Discrete Variable Status",             "hart_ip.pt.rsp.slot4_discrete_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_discrete_var_state,
      { "Slot5 Discrete Variable State",              "hart_ip.pt.rsp.slot5_discrete_var_state",
        FT_UINT16, BASE_DEC, NULL, 0x0,
        NULL, HFILL }
    },
    { &hf_hartip_pt_rsp_slot5_discrete_var_status,
      { "Slot5 Discrete Variable Status",             "hart_ip.pt.rsp.slot5_discrete_var_status",
        FT_UINT8, BASE_HEX, NULL, 0x0,
        NULL, HFILL }
    }
  };

  static gint *ett[] = {
    &ett_hartip,
    &ett_hartip_hdr,
    &ett_hartip_body
  };

  static ei_register_info ei[] = {
     { &ei_hartip_data_none, { "hart_ip.data.none", PI_PROTOCOL, PI_NOTE, "No data", EXPFILL }},
     { &ei_hartip_data_unexpected, { "hart_ip.data.unexpected", PI_PROTOCOL, PI_WARN, "Unexpected message body", EXPFILL }},
  };

  module_t *hartip_module;
  expert_module_t* expert_hartip;

  proto_hartip = proto_register_protocol("HART_IP Protocol", "HART_IP", "hart_ip");
  proto_register_field_array(proto_hartip, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
  expert_hartip = expert_register_protocol(proto_hartip);
  expert_register_field_array(expert_hartip, ei, array_length(ei));

  hartip_module = prefs_register_protocol(proto_hartip, NULL);
  prefs_register_bool_preference(hartip_module, "desegment",
                                  "Desegment all HART-IP messages spanning multiple TCP segments",
                                  "Whether the HART-IP dissector should desegment all messages spanning multiple TCP segments",
                                  &hartip_desegment);

  hartip_tap = register_tap("hart_ip");
}

void
proto_reg_handoff_hartip(void)
{
  hartip_tcp_handle = create_dissector_handle(dissect_hartip_tcp, proto_hartip);
  hartip_udp_handle = create_dissector_handle(dissect_hartip_udp, proto_hartip);
  dissector_add_uint_with_preference("udp.port", HARTIP_PORT, hartip_udp_handle);
  dissector_add_uint_with_preference("tcp.port", HARTIP_PORT, hartip_tcp_handle);

  stats_tree_register("hart_ip", "hart_ip", "HART-IP", 0,
                      hartip_stats_tree_packet, hartip_stats_tree_init, NULL);
}

/*
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 *
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 *
 * vi: set shiftwidth=2 tabstop=8 expandtab:
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 */