42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/*
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* Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#ifndef MODBUS_TCP_PRIVATE_H
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#define MODBUS_TCP_PRIVATE_H
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#define _MODBUS_TCP_HEADER_LENGTH 7
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#define _MODBUS_TCP_PRESET_REQ_LENGTH 12
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#define _MODBUS_TCP_PRESET_RSP_LENGTH 8
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#define _MODBUS_TCP_CHECKSUM_LENGTH 0
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/* In both structures, the transaction ID must be placed on first position
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to have a quick access not dependent of the TCP backend */
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typedef struct _modbus_tcp {
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/* Extract from MODBUS Messaging on TCP/IP Implementation Guide V1.0b
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(page 23/46):
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The transaction identifier is used to associate the future response
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with the request. This identifier is unique on each TCP connection. */
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uint16_t t_id;
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/* TCP port */
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int port;
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/* IP address */
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char ip[16];
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} modbus_tcp_t;
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typedef struct _modbus_tcp_pi {
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/* Transaction ID */
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uint16_t t_id;
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/* TCP port */
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int port;
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/* Node */
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char *node;
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/* Service */
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char *service;
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} modbus_tcp_pi_t;
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#endif /* MODBUS_TCP_PRIVATE_H */
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