34 lines
959 B
C
34 lines
959 B
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_H
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#define MODBUS_TCP_H
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#include "modbus.h"
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MODBUS_BEGIN_DECLS
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#define MODBUS_TCP_DEFAULT_PORT 502
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#define MODBUS_TCP_SLAVE 0xFF
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/* 参考 Modbus_Application_Protocol_V1_1b.pdf 第四章第一节第5页
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* TCP MODBUS 应用数据单元（ADU）= 253 字节数据 + MBAP 报文头（7 字节）= 共 260 字节
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*/
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#define MODBUS_TCP_MAX_ADU_LENGTH 260
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MODBUS_API modbus_t *modbus_new_tcp(const char *ip_address, int port);
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MODBUS_API int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
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MODBUS_API int modbus_tcp_accept(modbus_t *ctx, int *s);
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MODBUS_API modbus_t *modbus_new_tcp_pi(const char *node, const char *service);
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MODBUS_API int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
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MODBUS_API int modbus_tcp_pi_accept(modbus_t *ctx, int *s);
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MODBUS_END_DECLS
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#endif /* MODBUS_TCP_H */
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