有经验的合肥网站建设,家装设计理念,厦门做网站seo的,莆田网站建设制作使用libmodbus库开发modbusTcp从站#xff08;支持多个主站连接#xff09; Chapter1 使用libmodbus库开发modbusTcp从站(支持多个主站连接)rdsmodbusslave.hrdsmodbusslave.cppmain.cpp Chapter1 使用libmodbus库开发modbusTcp从站(支持多个主站连接)
参考链接#xff1a… 使用libmodbus库开发modbusTcp从站支持多个主站连接 Chapter1 使用libmodbus库开发modbusTcp从站(支持多个主站连接)rdsmodbusslave.hrdsmodbusslave.cppmain.cpp Chapter1 使用libmodbus库开发modbusTcp从站(支持多个主站连接)
参考链接https://blog.csdn.net/v6543210/article/details/127426450
https://blog.csdn.net/qq_38158479/article/details/120928043
当我们需要自己搞一个C/C版的 modbus Server时总想像C#里面借助个好用的库来实现但是libmodbus这个库封装的并不好用从官方的源码中连个example都没有能参考的也就tests目录下有几个可以借鉴。
但是仔细看了一下random-test-server.c 还是会阻塞的单线程。与拿来即用的标准相差甚远。
如果需要实现对多个客户端提供服务需要参考 bandwidth-server-many-up.c
本文借鉴这篇文章进行了一点优化实现了可以为多个客户端提供服务的modbus tcp Server可以拿来即用。
使用libmodbus库开发modbusTcp从站(支持多个主站连接)_酸菜。的博客-CSDN博客_libmodbus tcp
如果需要自己实现逻辑可以直接在另一个线程函数中对modbus的变量进行修改。
rdsmodbusslave.h
#ifndef RDSMODBUSSLAVE_H
#define RDSMODBUSSLAVE_H#include iostream
#include thread
#include stdlib.h
#include iostream
#include mutex
#include string
using namespace std;
/*如果是windows平台则要加载相应的静态库和头文件*/
#ifdef _WIN32
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include winsock2.h
#include windows.h
//#include modbus.h
#pragma comment(lib, Ws2_32.lib)
//#pragma comment(lib, modbus.lib)
/*linux平台*/
#else
//#include modbus/modbus.h
#include unistd.h
#include error.h
#include arpa/inet.h
#include sys/socket.h
#include sys/time.h
#include sys/select.h
#endif//#define MAX_POINT 50000
#include QObject
#include QThread
#include stdio.h
#include libmodbus/config.h
#include libmodbus/modbus.h
#include libmodbus/modbus-rtu.h
#include QTimer
#include QDebug
#include QStringList
#include QSerialPortInfo
#include QSerialPortclass RDSModbusSlave : public QObject
{Q_OBJECT
public:explicit RDSModbusSlave(QObject *parent nullptr);RDSModbusSlave(string host0.0.0.0, uint16_t port502);~RDSModbusSlave();public:void recieveMessages();bool modbus_set_slave_id(int id);bool initModbus(std::string Host_Ip, int port, bool debugging);uint8_t getTab_Input_Bits(int NumBit);bool setTab_Input_Bits(int NumBit, uint8_t Value);uint16_t getHoldingRegisterValue(int registerStartaddress);float getHoldingRegisterFloatValue(int registerStartaddress);bool setHoldingRegisterValue(int registerStartaddress, uint16_t Value);bool setHoldingRegisterValue(int registerStartaddress, float Value);bool setInputRegisterValue(int registerStartaddress, uint16_t Value);bool setInputRegisterValue(int registerStartaddress, float Value);private:std::mutex slavemutex;int m_errCount{ 0 };int m_modbusSocket{ -1 };bool m_initialized{ false };modbus_t* ctx{ nullptr };modbus_mapping_t* mapping{ nullptr };/*Mapping*/int m_numBits{ 60000 };int m_numInputBits{ 60000 };int m_numRegisters{ 60000 };int m_numInputRegisters{ 60000 };public:void loadFromConfigFile();void run();signals:};/*annotation:
(1)https://www.jianshu.com/p/0ed380fa39eb
(2)typedef struct _modbus_mapping_t
{int nb_bits; //线圈int start_bits;int nb_input_bits; //离散输入int start_input_bits;int nb_input_registers; //输入寄存器int start_input_registers;int nb_registers; //保持寄存器int start_registers;uint8_t *tab_bits;uint8_t *tab_input_bits;uint16_t *tab_input_registers;uint16_t *tab_registers;
}modbus_mapping_t;*/#endif // RDSMODBUSSLAVE_H
rdsmodbusslave.cpp
#include rdsmodbusslave.h#ifdef _WIN32
typedef int socklen_t;
#endifRDSModbusSlave::RDSModbusSlave(QObject *parent) : QObject(parent)
{}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief Constructor* version v1* return null* date 2021/10/6**************************************************************/
RDSModbusSlave::RDSModbusSlave(string host, uint16_t port)
{initModbus(host, port, false);//TODOthis-setHoldingRegisterValue(0, (uint16_t)0x1122);this-setHoldingRegisterValue(3, (uint16_t)0x3022);this-setHoldingRegisterValue(6, (uint16_t)0x6022);
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief Destructor* version v1* return null* date 2021/10/6**************************************************************/
RDSModbusSlave::~RDSModbusSlave()
{modbus_mapping_free(mapping);modbus_close(ctx);modbus_free(ctx);
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief 支持多个master同时连接* version v1* return null* date 2021/10/6**************************************************************/
void RDSModbusSlave::recieveMessages()
{uint8_t query[MODBUS_TCP_MAX_ADU_LENGTH];int master_socket;int rc;fd_set refset;fd_set rdset;/* Maximum file descriptor number */int fdmax;/* Clear the reference set of socket */FD_ZERO(refset);/* Add the server socket */FD_SET(m_modbusSocket, refset);/* Keep track of the max file descriptor */fdmax m_modbusSocket;while( true ){rdset refset;if (select(fdmax1, rdset, NULL, NULL, NULL) -1){perror(Server select() failure.);break;}/* Run through the existing connections looking for data to be* read */for (master_socket 0; master_socket fdmax; master_socket){if (!FD_ISSET(master_socket, rdset)){continue;}if (master_socket m_modbusSocket){/* A client is asking a new connection */socklen_t addrlen;struct sockaddr_in clientaddr;int newfd;/* Handle new connections */addrlen sizeof(clientaddr);memset(clientaddr, 0, sizeof(clientaddr));newfd accept(m_modbusSocket, (struct sockaddr *)clientaddr, addrlen);if (newfd -1){perror(Server accept() error);} else{FD_SET(newfd, refset);if (newfd fdmax){/* Keep track of the maximum */fdmax newfd;}printf(New connection from %s:%d on socket %d\n, inet_ntoa(clientaddr.sin_addr), clientaddr.sin_port, newfd);}} else{modbus_set_socket(ctx, master_socket);rc modbus_receive(ctx, query);if (rc 0){modbus_reply(ctx, query, rc, mapping);} else if (rc -1){/* This example server in ended on connection closing or* any errors. */printf(Connection closed on socket %d\n, master_socket);#ifdef _WIN32closesocket(master_socket);#elseclose(master_socket);#endif/* Remove from reference set */FD_CLR(master_socket, refset);if (master_socket fdmax){fdmax--;}}}}}m_initialized false;
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief modbus_set_slave_id* param id* version v1* return null* date 2021/10/19**************************************************************/
bool RDSModbusSlave::modbus_set_slave_id(int id)
{int rc modbus_set_slave(ctx, id);if (rc -1){fprintf(stderr, Invalid slave id\n);modbus_free(ctx);return false;}return true;
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief modbus initialization* param IP/PORT/debugflag* version v1* return null* date 2021/10/6**************************************************************/
bool RDSModbusSlave::initModbus(std::string Host_Ip 127.0.0.1, int port 502, bool debugging false)
{ctx modbus_new_tcp(Host_Ip.c_str(), port);modbus_set_debug(ctx, debugging);if (ctx NULL){fprintf(stderr, There was an error allocating the modbus\n);throw - 1;}m_modbusSocket modbus_tcp_listen(ctx, 1);/*设置线圈, 离散输入, 输入寄存器, 保持寄存器个数(数组元素个数))*/mapping modbus_mapping_new(m_numBits, m_numInputBits, m_numInputRegisters, m_numRegisters);if (mapping NULL){fprintf(stderr, Unable to assign mapping%s\n, modbus_strerror(errno));modbus_free(ctx);m_initialized false;return false;}m_initialized true;return true;
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief getTab_Input_Bits(获取输入寄存器某一位的值)* param NumBit(输入寄存器相应的bit位)* version v1* return null* date 2021/10/8**************************************************************/
uint8_t RDSModbusSlave::getTab_Input_Bits(int NumBit)
{if (!m_initialized){return -1;}return mapping-tab_input_bits[NumBit];
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief setTab_Input_Bits(设置输入寄存器某一位的值)* param NumBit(输入寄存器的起始地址)* param Value(输入寄存器的值)* version v1* return null* date 2021/10/8**************************************************************/
bool RDSModbusSlave::setTab_Input_Bits(int NumBit, uint8_t Value)
{if (NumBit (m_numInputBits - 1)){return false;}slavemutex.lock();mapping-tab_input_bits[NumBit] Value;slavemutex.unlock();return true;
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief getRegisterValue(获取保存寄存器的值)* param registerStartaddress(保存寄存器的起始地址)* version v1* return null* date 2021/10/6**************************************************************/
uint16_t RDSModbusSlave::getHoldingRegisterValue(int registerStartaddress)
{if (!m_initialized){return -1;}return mapping-tab_registers[registerStartaddress];
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief 获取寄存器里的浮点数* param registerStartaddress寄存器起始地址* version v1* return 两个uint16_t拼接而成的浮点值* date 2021/10/6**************************************************************/
float RDSModbusSlave::getHoldingRegisterFloatValue(int registerStartaddress)
{if (!m_initialized){return -1.0f;}return modbus_get_float_badc(mapping-tab_registers[registerStartaddress]);
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief setRegisterValue(设置保存寄存器的值类型为uint16_t)* param registerStartaddress(保存寄存器的起始地址)* param Value(写入到保存寄存器里的值)* version v1* return null* date 2021/10/6**************************************************************/
bool RDSModbusSlave::setHoldingRegisterValue(int registerStartaddress, uint16_t Value)
{if (registerStartaddress (m_numRegisters - 1)){return false;}slavemutex.lock();mapping-tab_registers[registerStartaddress] Value;slavemutex.unlock();return true;
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief setRegisterFloatValue(设置浮点值)* param (Value浮点值registerStartaddress寄存器起始地址)* version v1* return null* date 2021/10/8**************************************************************/
bool RDSModbusSlave::setHoldingRegisterValue(int registerStartaddress, float Value)
{if (registerStartaddress (m_numRegisters - 2)){return false;}/*小端模式*/slavemutex.lock();modbus_set_float(Value, mapping-tab_registers[registerStartaddress]);slavemutex.unlock();return true;
}bool RDSModbusSlave::setInputRegisterValue(int registerStartaddress, uint16_t Value)
{if (registerStartaddress (m_numRegisters - 1)){return false;}slavemutex.lock();mapping-tab_input_registers[registerStartaddress] Value;slavemutex.unlock();return true;
}bool RDSModbusSlave::setInputRegisterValue(int registerStartaddress, float Value)
{if (registerStartaddress (m_numRegisters - 2)){return false;}/*小端模式*/slavemutex.lock();modbus_set_float(Value, mapping-tab_input_registers[registerStartaddress]);slavemutex.unlock();return true;
}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief loadFromConfigFile* version v1* return null* date 2021/10/18**************************************************************/
void RDSModbusSlave::loadFromConfigFile()
{}/**************************************************************** file RDSModbusSlave.cpp* author seer-txj* brief run* version v1* return null* date 2021/10/18**************************************************************/
void RDSModbusSlave::run()
{std::thread loop([this](){while (true){if (m_initialized){recieveMessages();}else{m_initialized true;}}});loop.detach();return;
}
main.cpp
#include mainwindow.h#include QApplication//#include rdsmodbusslave.husing namespace std;void modbusRunner(RDSModbusSlave* server)
{server-recieveMessages();
}RDSModbusSlave modServer(127.0.0.1, 502);int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();std::thread modServerThread(modbusRunner, modServer);modServerThread.join();return a.exec();
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