First working commit

inc/modbus-tcp.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef MODBUS_TCP_H
+#define MODBUS_TCP_H
+
+#include "modbus.h"
+
+MODBUS_BEGIN_DECLS
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+/* Win32 with MinGW, supplement to <errno.h> */
+#include <winsock2.h>
+#if !defined(ECONNRESET)
+#define ECONNRESET WSAECONNRESET
+#endif
+#if !defined(ECONNREFUSED)
+#define ECONNREFUSED WSAECONNREFUSED
+#endif
+#if !defined(ETIMEDOUT)
+#define ETIMEDOUT WSAETIMEDOUT
+#endif
+#if !defined(ENOPROTOOPT)
+#define ENOPROTOOPT WSAENOPROTOOPT
+#endif
+#if !defined(EINPROGRESS)
+#define EINPROGRESS WSAEINPROGRESS
+#endif
+#endif
+
+#define MODBUS_TCP_DEFAULT_PORT 502
+#define MODBUS_TCP_SLAVE        0xFF
+
+/* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
+ * TCP MODBUS ADU = 253 bytes + MBAP (7 bytes) = 260 bytes
+ */
+#define MODBUS_TCP_MAX_ADU_LENGTH 260
+
+MODBUS_API modbus_t *modbus_new_tcp(const char *ip_address, int port);
+MODBUS_API int modbus_tcp_listen(modbus_t *ctx, int nb_connection);
+MODBUS_API int modbus_tcp_accept(modbus_t *ctx, int *s);
+
+MODBUS_API modbus_t *modbus_new_tcp_pi(const char *node, const char *service);
+MODBUS_API int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);
+MODBUS_API int modbus_tcp_pi_accept(modbus_t *ctx, int *s);
+
+MODBUS_END_DECLS
+
+#endif /* MODBUS_TCP_H */