在Linux下实现电力104规约通信

要在Linux下实现电力104规约通信，可以使用开源的104协议栈库，例如lib60870。下面是基本的步骤：

1. 下载并安装lib60870库。

2. 编写程序，使用lib60870库的API来实现104协议通信。

3. 配置和连接设备，确保设备和计算机之间的通信正常。

4. 编译和运行程序。

以下是一个简单的104协议通信程序示例：

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <60870.h>

#define ASDU_SIZE 128
#define BUFFER_SIZE 2048
#define TIMEOUT_MS 5000

static int running = 1;

void sigint_handler(int signum)
{
    running = 0;
}

int main(int argc, char *argv[])
{
    int fd = -1;
    uint8_t buffer[BUFFER_SIZE];
    uint16_t buffer_length = 0;
    struct sftm_timeval timeout = {0, TIMEOUT_MS};
    struct sftm_timeval tstart, tend;
    uint32_t elapsed_time_ms;
    uint8_t asdu_data[ASDU_SIZE];
    struct iec60870_asdu asdu = {IEC60870_ASDU_C_IC_NA_1, true, 1, asdu_data, ASDU_SIZE};
    struct iec60870_cause_of_transmission cot = {false, false, false, 6};
    struct iec60870_address address = {1, 1};
    struct iec60870_connection_parameters params = {IEC60870_LM_ACT, 240, 1, 1, 1, 1, 1, 1, 1};
    struct iec60870_initiator_parameters initiator = {&address, &cot, &asdu, &params};

    signal(SIGINT, sigint_handler);

    fd = iec60870_client_connect("127.0.0.1", 2404, IEC60870_LINK_LAYER_TYPE_TCP);

    if (fd < 0) {
        printf("Failed to connect to remote server\n");
        return EXIT_FAILURE;
    }

    while (running) {
        if (iec60870_client_receive(fd, buffer, BUFFER_SIZE, &timeout, &buffer_length) == IEC60870_RC_TIMEOUT) {
            continue;
        }

        gettimeofday(&tstart, NULL);
        iec60870_client_send(fd, &initiator);
        iec60870_client_receive(fd, buffer, BUFFER_SIZE, &timeout, &buffer_length);
        gettimeofday(&tend, NULL);

        elapsed_time_ms = (tend.tv_sec - tstart.tv_sec) * 1000 + (tend.tv_usec - tstart.tv_usec) / 1000;

        if (elapsed_time_ms >= TIMEOUT_MS) {
            printf("Timeout waiting for response\n");
            continue;
        }

        struct iec60870_asdu response_asdu;
        if (iec60870_asdu_from_bytes(buffer, buffer_length, &response_asdu)) {
            printf("Received ASDU with type %d, address %d, cause of transmission %d\n", response_asdu.type, response_asdu.address, response_asdu.cause_of_transmission.cot);
        }
    }

    iec60870_client_disconnect(fd);

    return EXIT_SUCCESS;
}

这个程序是一个简单的104协议客户端，它连接到一个远程服务器，并发送一个C_IC_NA_1类型的ASDU。当接收到响应时，它将打印ASDU的类型、地址和传输原因。程序使用lib60870库提供的API，包括iec60870_client_connect()、iec60870_client_send()、iec60870_client_receive()和iec60870_client_disconnect()等函数。