opcua开源代码OPEN62541的交叉编译

一、介绍
OPEN62541是opcua的一个开源代码，支持server 和client，免费，在交叉编译的时候还是有一些坑，这里介绍在嵌入式设备中交叉编译open62541

二、下载

源代码下载
git clone -b v1.1.6  https://github.com/open62541/open62541.git
子模块下载
进入下载目录
git submodule update --init --recursive

三、编译
需要安装cmake，这里用的3.0版本的

1、生成源文件
1）进入源码目录
2）新建build目录

mkdir build

3）进入build目录

cmake .. -DUA_ENABLE_AMALGAMATION=ON

4）make
生成源文件open62541.c open62541.h 在当前build目录，以及静态库在bin/lib

2、修改open62541.c
在嵌入式设备上一般只能用ipv4，所以要修改tcp协议；
修改“hints.ai_family = AF_UNSPEC;”
为“hints.ai_family = AF_INET;”
一共3处

3、编译
工程目录
opcua_main.c

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//        头文件区
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <stdio.h>
#include <string.h>
#include <memory.h>
#include <signal.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include "open62541.h"


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//        接口定义区
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//        变量定义区
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


static UA_Boolean running = true;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//        函数定义区
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
static void stopHandler(int sign) 
{
    UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_SERVER, "received ctrl-c");
    running = false;
}

static void addVariable(UA_Server *server) 
{
    /* Define the attribute of the myInteger variable node */
    UA_VariableAttributes attr = UA_VariableAttributes_default;
    UA_Int32 myInteger = 42;
    UA_Variant_setScalar(&attr.value, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
    attr.description = UA_LOCALIZEDTEXT("en-US","the answer");
    attr.displayName = UA_LOCALIZEDTEXT("en-US","the answer");
    attr.dataType = UA_TYPES[UA_TYPES_INT32].typeId;
    attr.accessLevel = UA_ACCESSLEVELMASK_READ | UA_ACCESSLEVELMASK_WRITE;

    /* Add the variable node to the information model */
    UA_NodeId myIntegerNodeId = UA_NODEID_STRING(1, "the.answer");
    UA_QualifiedName myIntegerName = UA_QUALIFIEDNAME(1, "the answer");
    UA_NodeId parentNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
    UA_NodeId parentReferenceNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES);
    UA_Server_addVariableNode(server, myIntegerNodeId, parentNodeId,
                              parentReferenceNodeId, myIntegerName,
                              UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE), attr, NULL, NULL);
}

int main(void)
{
	UA_StatusCode retval;
    printf("opcua_server_run\n");
    system("iptables -I INPUT -p tcp --dport 4840 -j ACCEPT");
    signal(SIGINT, stopHandler);
    signal(SIGTERM, stopHandler);

    UA_Server *server = UA_Server_new();
    UA_ServerConfig_setDefault(UA_Server_getConfig(server));
    addVariable(server);
    printf("start opcua server\n");
    
    retval = UA_Server_run(server, &running);
    UA_Server_delete(server);
    printf("retval %d\n",retval);
    return retval == UA_STATUSCODE_GOOD ? EXIT_SUCCESS : EXIT_FAILURE;
}

build.sh

arm-linux-gcc opcua_main.c  open62541.c -o opcua_server -std=c99;

执行.sh build.sh

至此编译完成
将执行文件放到板子上即可