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1951b1d923
nanoMODBUS/modbusino.c
Valerio De Benedetto 1951b1d923 Minimum functionality
2022-01-20 20:03:38 +01:00

1105 lines
30 KiB
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#include "modbusino.h"
#include <stdbool.h>
#include <string.h>
#include <time.h>
#if !defined(MBSN_BIG_ENDIAN) && !defined(MBSN_LITTLE_ENDIAN)
#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN || defined(__BIG_ENDIAN__) || defined(__ARMEB__) || \
defined(__THUMBEB__) || defined(__AARCH64EB__) || defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__)
#define MBSN_BIG_ENDIAN
#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN || defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || \
defined(__THUMBEL__) || defined(__AARCH64EL__) || defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
#define MBSN_LITTLE_ENDIAN
#else
#error "Failed to automatically detect platform endianness. Please define either MBSN_BIG_ENDIAN or MBSN_LITTLE_ENDIAN"
#endif
#endif
#define get_1(m) \
(m)->msg_buf[(m)->msg_buf_idx]; \
(m)->msg_buf_idx++
#define put_1(m, b) \
(m)->msg_buf[(m)->msg_buf_idx] = (b); \
(m)->msg_buf_idx++
#ifdef MBSN_BIG_ENDIAN
#define get_2(m) \
(*(uint16_t*) ((m)->msg_buf + (m)->msg_buf_idx)); \
(m)->msg_buf_idx += 2
#define put_2(m, w) \
(*(uint16_t*) ((m)->msg_buf + (m)->msg_buf_idx)) = (w); \
(m)->msg_buf_idx += 2
#else
#define get_2(m) \
((uint16_t) ((m)->msg_buf[(m)->msg_buf_idx + 1])) | (((uint16_t) (m)->msg_buf[(m)->msg_buf_idx] << 8)); \
(m)->msg_buf_idx += 2
#define put_2(m, w) \
(m)->msg_buf[(m)->msg_buf_idx] = ((uint8_t) ((((uint16_t) (w)) & 0xFF00) >> 8)); \
(m)->msg_buf[(m)->msg_buf_idx + 1] = ((uint8_t) (((uint16_t) (w)) & 0x00FF)); \
(m)->msg_buf_idx += 2
#endif
typedef struct msg_state {
uint8_t unit_id;
uint8_t fc;
uint16_t transaction_id;
bool broadcast;
bool ignored;
} msg_state;
static msg_state msg_state_create() {
msg_state s;
memset(&s, 0, sizeof(msg_state));
return s;
}
static msg_state res_from_req(msg_state* req) {
msg_state res = *req;
return res;
}
static msg_state req_create(uint8_t unit_id, uint8_t fc) {
static uint16_t TID = 0x0102;
msg_state req = msg_state_create();
req.unit_id = unit_id;
req.fc = fc;
req.transaction_id = TID;
if (req.unit_id == 0)
req.broadcast = true;
TID++;
return req;
}
int mbsn_create(mbsn_t* mbsn, const mbsn_platform_conf* platform_conf) {
if (!mbsn)
return MBSN_ERROR_INVALID_ARGUMENT;
memset(mbsn, 0, sizeof(mbsn_t));
mbsn->byte_timeout_ms = -1;
mbsn->read_timeout_ms = -1;
if (!platform_conf)
return MBSN_ERROR_INVALID_ARGUMENT;
if (platform_conf->transport != MBSN_TRANSPORT_RTU && platform_conf->transport != MBSN_TRANSPORT_TCP)
return MBSN_ERROR_INVALID_ARGUMENT;
if (!platform_conf->read_byte || !platform_conf->write_byte || !platform_conf->sleep)
return MBSN_ERROR_INVALID_ARGUMENT;
mbsn->platform = *platform_conf;
return MBSN_ERROR_NONE;
}
mbsn_error mbsn_client_create(mbsn_t* mbsn, const mbsn_platform_conf* platform_conf) {
return mbsn_create(mbsn, platform_conf);
}
mbsn_error mbsn_server_create(mbsn_t* mbsn, uint8_t address, const mbsn_platform_conf* transport_conf,
mbsn_callbacks callbacks) {
if (address == 0)
return MBSN_ERROR_INVALID_ARGUMENT;
mbsn_error ret = mbsn_create(mbsn, transport_conf);
if (ret != MBSN_ERROR_NONE)
return ret;
mbsn->address_rtu = address;
mbsn->callbacks = callbacks;
return MBSN_ERROR_NONE;
}
void mbsn_set_read_timeout(mbsn_t* mbsn, int32_t timeout_ms) {
mbsn->read_timeout_ms = timeout_ms;
}
void mbsn_set_byte_timeout(mbsn_t* mbsn, int32_t timeout_ms) {
mbsn->byte_timeout_ms = timeout_ms;
}
void mbsn_set_destination_rtu_address(mbsn_t* mbsn, uint8_t address) {
mbsn->dest_address_rtu = address;
}
static uint16_t crc_calc(const uint8_t* data, unsigned int length) {
uint16_t crc = 0xFFFF;
for (int i = 0; i < length; i++) {
crc ^= (uint16_t) data[i];
for (int j = 8; j != 0; j--) {
if ((crc & 0x0001) != 0) {
crc >>= 1;
crc ^= 0xA001;
}
else
crc >>= 1;
}
}
return crc;
}
static void reset_msg_buf(mbsn_t* mbsn) {
mbsn->msg_buf_idx = 0;
}
static mbsn_error recv(mbsn_t* mbsn, uint32_t count) {
int r = 0;
while (r != count) {
int ret = mbsn->platform.read_byte(mbsn->msg_buf + mbsn->msg_buf_idx + r, mbsn->byte_timeout_ms);
if (ret == 0)
return MBSN_ERROR_TIMEOUT;
else if (ret != 1)
return MBSN_ERROR_TRANSPORT;
r++;
}
return MBSN_ERROR_NONE;
}
static mbsn_error send(mbsn_t* mbsn) {
for (int i = 0; i < mbsn->msg_buf_idx; i++) {
int ret = mbsn->platform.write_byte(mbsn->msg_buf[i], mbsn->read_timeout_ms);
if (ret == 0)
return MBSN_ERROR_TIMEOUT;
else if (ret != 1)
return MBSN_ERROR_TRANSPORT;
}
return MBSN_ERROR_NONE;
}
static mbsn_error recv_msg_header(mbsn_t* mbsn, msg_state* s_out, bool* first_byte_received) {
// We wait for the read timeout here, just for the first message byte
int32_t old_byte_timeout = mbsn->byte_timeout_ms;
mbsn->byte_timeout_ms = mbsn->read_timeout_ms;
*s_out = msg_state_create();
reset_msg_buf(mbsn);
if (first_byte_received)
*first_byte_received = false;
if (mbsn->platform.transport == MBSN_TRANSPORT_RTU) {
mbsn_error err = recv(mbsn, 1);
mbsn->byte_timeout_ms = old_byte_timeout;
if (err != MBSN_ERROR_NONE)
return err;
if (first_byte_received)
*first_byte_received = true;
uint8_t unit_id = get_1(mbsn);
// Check if message is for us
if (unit_id == 0)
s_out->broadcast = true;
else if (unit_id != mbsn->address_rtu)
s_out->ignored = true;
else
s_out->ignored = false;
err = recv(mbsn, 1);
if (err != MBSN_ERROR_NONE)
return err;
s_out->fc = get_1(mbsn);
}
else if (mbsn->platform.transport == MBSN_TRANSPORT_TCP) {
mbsn_error err = recv(mbsn, 1);
mbsn->byte_timeout_ms = old_byte_timeout;
if (err != MBSN_ERROR_NONE)
return err;
if (first_byte_received)
*first_byte_received = true;
// Advance buf_idx
get_1(mbsn);
err = recv(mbsn, 7);
if (err != MBSN_ERROR_NONE)
return err;
// Starting over
reset_msg_buf(mbsn);
s_out->transaction_id = get_2(mbsn);
uint16_t protocol_id = get_2(mbsn);
uint16_t length = get_2(mbsn); // We should actually check the length of the request against this value
s_out->unit_id = get_1(mbsn);
s_out->fc = get_1(mbsn);
if (protocol_id != 0)
return MBSN_ERROR_TRANSPORT;
if (length > 255)
return MBSN_ERROR_TRANSPORT;
}
return MBSN_ERROR_NONE;
}
static mbsn_error recv_msg_footer(mbsn_t* mbsn) {
if (mbsn->platform.transport == MBSN_TRANSPORT_RTU) {
uint16_t crc = crc_calc(mbsn->msg_buf, mbsn->msg_buf_idx);
mbsn_error err = recv(mbsn, 2);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t recv_crc = get_2(mbsn);
if (recv_crc != crc)
return MBSN_ERROR_TRANSPORT;
}
return MBSN_ERROR_NONE;
}
static void send_msg_header(mbsn_t* mbsn, msg_state* s, uint16_t data_length) {
reset_msg_buf(mbsn);
if (mbsn->platform.transport == MBSN_TRANSPORT_RTU) {
put_1(mbsn, s->unit_id);
}
else if (mbsn->platform.transport == MBSN_TRANSPORT_TCP) {
put_2(mbsn, s->transaction_id);
put_2(mbsn, 0);
put_2(mbsn, (uint16_t) (1 + 1 + data_length));
put_1(mbsn, s->unit_id);
}
put_1(mbsn, s->fc);
}
static mbsn_error send_msg_footer(mbsn_t* mbsn) {
if (mbsn->platform.transport == MBSN_TRANSPORT_RTU) {
uint16_t crc = crc_calc(mbsn->msg_buf, mbsn->msg_buf_idx);
put_2(mbsn, crc);
}
mbsn_error err = send(mbsn);
return err;
}
static mbsn_error handle_exception(mbsn_t* mbsn, msg_state* req, uint8_t exception) {
msg_state res = *req;
res.fc += 0x80;
send_msg_header(mbsn, &res, 1);
put_1(mbsn, exception);
return send_msg_footer(mbsn);
}
static mbsn_error handle_read_discrete(mbsn_t* mbsn, msg_state* req,
mbsn_error (*callback)(uint16_t, uint16_t, mbsn_bitfield)) {
mbsn_error err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address = get_2(mbsn);
uint16_t quantity = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (!req->ignored) {
if (quantity < 1 || quantity > 2000)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if ((uint32_t) address + (uint32_t) quantity > 65535)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_ADDRESS);
if (callback) {
mbsn_bitfield bf;
err = callback(address, quantity, bf);
if (err != MBSN_ERROR_NONE) {
if (err < 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_SERVER_DEVICE_FAILURE);
else
return err;
}
if (!req->broadcast) {
uint8_t discrete_bytes = (quantity / 8) + 1;
msg_state res = res_from_req(req);
send_msg_header(mbsn, &res, discrete_bytes);
put_1(mbsn, discrete_bytes);
for (int i = 0; i < discrete_bytes; i++) {
put_1(mbsn, bf[i]);
}
err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
}
}
else {
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error handle_read_registers(mbsn_t* mbsn, msg_state* req,
mbsn_error (*callback)(uint16_t, uint16_t, uint16_t*)) {
mbsn_error err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address = get_2(mbsn);
uint16_t quantity = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (!req->ignored) {
if (quantity < 1 || quantity > 125)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if ((uint32_t) address + (uint32_t) quantity > 65535)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_ADDRESS);
if (callback) {
uint16_t regs[125];
err = callback(address, quantity, regs);
if (err != MBSN_ERROR_NONE) {
if (err < 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_SERVER_DEVICE_FAILURE);
else
return err;
}
if (!req->broadcast) {
uint8_t regs_bytes = quantity * 2;
msg_state res = res_from_req(req);
send_msg_header(mbsn, &res, regs_bytes);
put_1(mbsn, regs_bytes);
for (int i = 0; i < quantity; i++) {
put_2(mbsn, regs[i]);
}
err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
}
}
else {
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error handle_read_coils(mbsn_t* mbsn, msg_state* req) {
return handle_read_discrete(mbsn, req, mbsn->callbacks.read_coils);
}
static mbsn_error handle_read_discrete_inputs(mbsn_t* mbsn, msg_state* req) {
return handle_read_discrete(mbsn, req, mbsn->callbacks.read_discrete_inputs);
}
static mbsn_error handle_read_holding_registers(mbsn_t* mbsn, msg_state* req) {
return handle_read_registers(mbsn, req, mbsn->callbacks.read_holding_registers);
}
static mbsn_error handle_read_input_registers(mbsn_t* mbsn, msg_state* req) {
return handle_read_registers(mbsn, req, mbsn->callbacks.read_input_registers);
}
static mbsn_error handle_write_single_coil(mbsn_t* mbsn, msg_state* req) {
mbsn_error err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address = get_2(mbsn);
uint16_t value = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (!req->ignored) {
if (value != 0 && value != 0xFF00)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if (mbsn->callbacks.write_single_coil) {
err = mbsn->callbacks.write_single_coil(address, value == 0 ? false : true);
if (err != MBSN_ERROR_NONE) {
if (err < 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_SERVER_DEVICE_FAILURE);
else
return err;
}
if (!req->broadcast) {
msg_state res = res_from_req(req);
send_msg_header(mbsn, &res, 2);
put_2(mbsn, address);
err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
}
}
else {
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error handle_write_single_register(mbsn_t* mbsn, msg_state* req) {
mbsn_error err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address = get_2(mbsn);
uint16_t value = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (!req->ignored) {
if (mbsn->callbacks.write_single_register) {
err = mbsn->callbacks.write_single_register(address, value);
if (err != MBSN_ERROR_NONE) {
if (err < 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
else
return err;
}
if (!req->broadcast) {
msg_state res = res_from_req(req);
send_msg_header(mbsn, &res, 1);
put_2(mbsn, value);
err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
}
}
else {
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error handle_write_multiple_coils(mbsn_t* mbsn, msg_state* req) {
mbsn_error err = recv(mbsn, 5);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address = get_2(mbsn);
uint16_t quantity = get_2(mbsn);
uint8_t coils_bytes = get_1(mbsn);
err = recv(mbsn, coils_bytes);
if (err != MBSN_ERROR_NONE)
return err;
mbsn_bitfield coils;
for (int i = 0; i < coils_bytes; i++)
coils[i] = get_1(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (!req->ignored) {
if (quantity < 1 || quantity > 0x07B0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if (coils_bytes == 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if ((quantity / 8) + 1 != coils_bytes)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if (mbsn->callbacks.write_multiple_coils) {
err = mbsn->callbacks.write_multiple_coils(address, quantity, coils);
if (err != MBSN_ERROR_NONE) {
if (err < 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_SERVER_DEVICE_FAILURE);
else
return err;
}
if (!req->broadcast) {
msg_state res = res_from_req(req);
send_msg_header(mbsn, &res, 4);
put_2(mbsn, address);
put_2(mbsn, quantity);
err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
}
}
else {
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error handle_write_multiple_registers(mbsn_t* mbsn, msg_state* req) {
mbsn_error err = recv(mbsn, 5);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address = get_2(mbsn);
uint16_t quantity = get_2(mbsn);
uint8_t registers_bytes = get_1(mbsn);
err = recv(mbsn, registers_bytes);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t registers[0x007B];
for (int i = 0; i < quantity; i++) {
registers[i] = get_2(mbsn);
}
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (!req->ignored) {
if (quantity < 1 || quantity > 0x007B)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if (registers_bytes == 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if (registers_bytes != quantity * 2)
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_DATA_VALUE);
if (mbsn->callbacks.write_multiple_registers) {
err = mbsn->callbacks.write_multiple_registers(address, quantity, registers);
if (err != MBSN_ERROR_NONE) {
if (err < 0)
return handle_exception(mbsn, req, MBSN_EXCEPTION_SERVER_DEVICE_FAILURE);
else
return err;
}
if (!req->broadcast) {
msg_state res = res_from_req(req);
send_msg_header(mbsn, &res, 4);
put_2(mbsn, address);
put_2(mbsn, quantity);
err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
}
}
else {
return handle_exception(mbsn, req, MBSN_EXCEPTION_ILLEGAL_FUNCTION);
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error handle_req_fc(mbsn_t* mbsn, msg_state* req) {
mbsn_error err;
switch (req->fc) {
case 1:
err = handle_read_coils(mbsn, req);
break;
case 2:
err = handle_read_discrete_inputs(mbsn, req);
break;
case 3:
err = handle_read_holding_registers(mbsn, req);
break;
case 4:
err = handle_read_input_registers(mbsn, req);
break;
case 5:
err = handle_write_single_coil(mbsn, req);
break;
case 6:
err = handle_write_single_register(mbsn, req);
break;
case 15:
err = handle_write_multiple_coils(mbsn, req);
break;
case 16:
err = handle_write_multiple_registers(mbsn, req);
break;
default:
err = MBSN_EXCEPTION_ILLEGAL_FUNCTION;
}
return err;
}
mbsn_error mbsn_server_receive(mbsn_t* mbsn) {
msg_state req = msg_state_create();
bool first_byte_received = false;
mbsn_error err = recv_msg_header(mbsn, &req, &first_byte_received);
if (err != MBSN_ERROR_NONE) {
if (!first_byte_received && err == MBSN_ERROR_TIMEOUT)
return MBSN_ERROR_NONE;
else
return err;
}
/*
// We should wait for the read timeout for the first message byte
int32_t old_byte_timeout = mbsn->byte_timeout_ms;
mbsn->byte_timeout_ms = mbsn->read_timeout_ms;
if (mbsn->transport == MBSN_TRANSPORT_RTU) {
uint8_t id;
mbsn_error err = recv_1(mbsn, &id, &req.crc);
mbsn->byte_timeout_ms = old_byte_timeout;
if (err != 0) {
if (err == MBSN_ERROR_TIMEOUT)
return MBSN_ERROR_NONE;
else
return err;
}
// Check if request is for us
if (id == 0)
req.broadcast = true;
else if (id != mbsn->address_rtu)
req.ignored = true;
else
req.ignored = false;
err = recv_1(mbsn, &req.fc, &req.crc);
if (err != MBSN_ERROR_NONE)
return err;
}
else if (mbsn->transport == MBSN_TRANSPORT_TCP) {
mbsn_error err = recv_2(mbsn, &req.transaction_id, NULL);
mbsn->byte_timeout_ms = old_byte_timeout;
if (err != 0) {
if (err == MBSN_ERROR_TIMEOUT)
return MBSN_ERROR_NONE;
else
return err;
}
uint16_t protocol_id = 0xFFFF;
err = recv_2(mbsn, &protocol_id, NULL);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t length = 0xFFFF;
err = recv_2(mbsn, &length, NULL);
if (err != MBSN_ERROR_NONE)
return err;
err = recv_1(mbsn, &req.unit_id, NULL);
if (err != MBSN_ERROR_NONE)
return err;
err = recv_1(mbsn, &req.fc, NULL);
if (err != MBSN_ERROR_NONE)
return err;
if (protocol_id != 0)
return MBSN_ERROR_TRANSPORT;
// TODO maybe we should actually check the length of the request against this value
if (length == 0xFFFF)
return MBSN_ERROR_TRANSPORT;
}
*/
return handle_req_fc(mbsn, &req);
}
static mbsn_error recv_res_header(mbsn_t* mbsn, msg_state* req, msg_state* res_out) {
mbsn_error err = recv_msg_header(mbsn, res_out, NULL);
if (err != MBSN_ERROR_NONE)
return err;
if (mbsn->platform.transport == MBSN_TRANSPORT_TCP) {
if (res_out->transaction_id != req->transaction_id)
return MBSN_ERROR_INVALID_RESPONSE;
}
if (res_out->ignored)
return MBSN_ERROR_INVALID_RESPONSE;
if (res_out->fc != req->fc) {
if (res_out->fc - 0x80 == req->fc) {
err = recv(mbsn, 1);
if (err != MBSN_ERROR_NONE)
return err;
uint8_t exception = get_1(mbsn);
if (exception < 1 || exception > 4)
return MBSN_ERROR_INVALID_RESPONSE;
else
return exception;
}
else {
return MBSN_ERROR_INVALID_RESPONSE;
}
}
return MBSN_ERROR_NONE;
}
static mbsn_error read_discrete(mbsn_t* mbsn, uint8_t fc, uint16_t address, uint16_t quantity, mbsn_bitfield values) {
if (quantity < 1 || quantity > 2000)
return MBSN_ERROR_INVALID_ARGUMENT;
msg_state req = req_create(mbsn->dest_address_rtu, fc);
send_msg_header(mbsn, &req, 4);
put_2(mbsn, address);
put_2(mbsn, quantity);
mbsn_error err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
msg_state res;
err = recv_res_header(mbsn, &req, &res);
if (err != MBSN_ERROR_NONE)
return err;
err = recv(mbsn, 1);
if (err != MBSN_ERROR_NONE)
return err;
uint8_t coils_bytes = get_1(mbsn);
err = recv(mbsn, coils_bytes);
if (err != MBSN_ERROR_NONE)
return err;
for (int i = 0; i < coils_bytes; i++) {
values[i] = get_1(mbsn);
}
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
return MBSN_ERROR_NONE;
}
mbsn_error mbsn_read_coils(mbsn_t* mbsn, uint16_t address, uint16_t quantity, mbsn_bitfield coils_out) {
return read_discrete(mbsn, 1, address, quantity, coils_out);
}
mbsn_error mbsn_read_discrete_inputs(mbsn_t* mbsn, uint16_t address, uint16_t quantity, mbsn_bitfield inputs_out) {
return read_discrete(mbsn, 2, address, quantity, inputs_out);
}
mbsn_error read_registers(mbsn_t* mbsn, uint8_t fc, uint16_t address, uint16_t quantity, uint16_t* registers) {
if (quantity < 1 || quantity > 125)
return MBSN_ERROR_INVALID_ARGUMENT;
msg_state req = req_create(mbsn->dest_address_rtu, fc);
send_msg_header(mbsn, &req, 4);
put_2(mbsn, address);
put_2(mbsn, quantity);
mbsn_error err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
msg_state res;
err = recv_res_header(mbsn, &req, &res);
if (err != MBSN_ERROR_NONE)
return err;
err = recv(mbsn, 1);
if (err != MBSN_ERROR_NONE)
return err;
uint8_t registers_bytes = get_1(mbsn);
err = recv(mbsn, registers_bytes);
if (err != MBSN_ERROR_NONE)
return err;
for (int i = 0; i < registers_bytes / 2; i++) {
registers[i] = get_2(mbsn);
}
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (registers_bytes != quantity * 2)
return MBSN_ERROR_INVALID_RESPONSE;
return MBSN_ERROR_NONE;
}
mbsn_error mbsn_read_holding_registers(mbsn_t* mbsn, uint16_t address, uint16_t quantity, uint16_t* registers_out) {
return read_registers(mbsn, 3, address, quantity, registers_out);
}
mbsn_error mbsn_read_input_registers(mbsn_t* mbsn, uint16_t address, uint16_t quantity, uint16_t* registers_out) {
return read_registers(mbsn, 4, address, quantity, registers_out);
}
mbsn_error mbsn_write_single_coil(mbsn_t* mbsn, uint16_t address, bool value) {
msg_state req = req_create(mbsn->dest_address_rtu, 5);
send_msg_header(mbsn, &req, 4);
put_2(mbsn, address);
put_2(mbsn, value ? 0xFF00 : 0);
mbsn_error err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
msg_state res;
err = recv_res_header(mbsn, &req, &res);
if (err != MBSN_ERROR_NONE)
return err;
err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address_res = get_2(mbsn);
uint16_t value_res = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (address_res != address)
return MBSN_ERROR_INVALID_RESPONSE;
if (value_res != value)
return MBSN_ERROR_INVALID_RESPONSE;
return MBSN_ERROR_NONE;
}
mbsn_error mbsn_write_single_register(mbsn_t* mbsn, uint16_t address, uint16_t value) {
msg_state req = req_create(mbsn->dest_address_rtu, 5);
send_msg_header(mbsn, &req, 4);
put_2(mbsn, address);
put_2(mbsn, value);
mbsn_error err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
msg_state res;
err = recv_res_header(mbsn, &req, &res);
if (err != MBSN_ERROR_NONE)
return err;
err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address_res = get_2(mbsn);
uint16_t value_res = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (address_res != address)
return MBSN_ERROR_INVALID_RESPONSE;
if (value_res != value)
return MBSN_ERROR_INVALID_RESPONSE;
return MBSN_ERROR_NONE;
}
mbsn_error mbsn_write_multiple_coils(mbsn_t* mbsn, uint16_t address, uint16_t quantity, const mbsn_bitfield coils) {
if (quantity < 0 || quantity > 0x07B0)
return MBSN_ERROR_INVALID_ARGUMENT;
uint8_t coils_bytes = (quantity / 8) + 1;
msg_state req = req_create(mbsn->dest_address_rtu, 15);
send_msg_header(mbsn, &req, 5 + coils_bytes);
put_2(mbsn, address);
put_2(mbsn, quantity);
put_1(mbsn, coils_bytes);
for (int i = 0; i < coils_bytes; i++) {
put_1(mbsn, coils[i]);
}
mbsn_error err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
msg_state res;
err = recv_res_header(mbsn, &req, &res);
if (err != MBSN_ERROR_NONE)
return err;
err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address_res = get_2(mbsn);
uint16_t quantity_res = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (address_res != address)
return MBSN_ERROR_INVALID_RESPONSE;
if (quantity_res != quantity)
return MBSN_ERROR_INVALID_RESPONSE;
return MBSN_ERROR_NONE;
}
mbsn_error mbsn_write_multiple_registers(mbsn_t* mbsn, uint16_t address, uint16_t quantity, const uint16_t* registers) {
if (quantity < 0 || quantity > 0x007B)
return MBSN_ERROR_INVALID_ARGUMENT;
uint8_t registers_bytes = quantity * 2;
msg_state req = req_create(mbsn->dest_address_rtu, 16);
send_msg_header(mbsn, &req, 5 + registers_bytes);
put_2(mbsn, address);
put_2(mbsn, quantity);
put_1(mbsn, registers_bytes);
for (int i = 0; i < quantity; i++) {
put_2(mbsn, registers[i]);
}
mbsn_error err = send_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
msg_state res;
err = recv_res_header(mbsn, &req, &res);
if (err != MBSN_ERROR_NONE)
return err;
err = recv(mbsn, 4);
if (err != MBSN_ERROR_NONE)
return err;
uint16_t address_res = get_2(mbsn);
uint16_t quantity_res = get_2(mbsn);
err = recv_msg_footer(mbsn);
if (err != MBSN_ERROR_NONE)
return err;
if (address_res != address)
return MBSN_ERROR_INVALID_RESPONSE;
if (quantity_res != quantity)
return MBSN_ERROR_INVALID_RESPONSE;
return MBSN_ERROR_NONE;
}
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