J1939中任何请求的连接中断是否与目的地有关？

J1939协议中的连接是基于SAE J2534标准的，使用在CAN总线上传输多个数据包的方式。虽然在某些情况下连接中断是由目标设备引起的，但它不是特定于目标设备的。要解决连接中断问题，可以在代码中实现连接状态机，以确保连接的可靠性。下面是一个基本的连接状态机示例：

typedef enum {
    SMB_IDLE,
    SMB_CONNECTING,
    SMB_CONNECTED,
    SMB_DISCONNECTED,
    SMB_ERROR
} SMB_STATE;

SMB_STATE smState = SMB_IDLE;

BOOL CanConnect(uint8_t destAddr, uint8_t priority) {
    BOOL success = FALSE;
    
    // check if already connected
    if (smState == SMB_CONNECTED && destAddr == smbDestAddr) {
        success = TRUE;
    } else {
        smState = SMB_CONNECTING;
        
        // send connection request
        if (CanSendMessage(destAddr, priority, CONNECT_REQUEST)) {
            smState = SMB_CONNECTED;
            smbDestAddr = destAddr;
            success = TRUE;
        } else {
            smState = SMB_ERROR;
        }
    }
    
    return success;
}

void CanDisconnect(void) {
    if (smState == SMB_CONNECTED) {
        // send disconnect request
        if (CanSendMessage(smbDestAddr, LOWEST_PRIORITY, DISCONNECT_REQUEST)) {
            smState = SMB_DISCONNECTED;
        } else {
            smState = SMB_ERROR;
        }
    }
}

void CanHandleMessage(CAN_MESSAGE message) {
    if (message.id == CONNECT_REQUEST && smState == SMB_IDLE) {
        // send connect response
        if (CanSendMessage(message.srcAddr, LOWEST_PRIORITY, CONNECT_RESPONSE)) {
            smState = SMB_CONNECTED;
            smbDestAddr = message.srcAddr;
        } else {
            smState = SMB_ERROR;
        }
    } else if (message.id == DISCONNECT_REQUEST && smState == SMB_CONNECTED && message.srcAddr == smbDestAddr) {
        smState = SMB_DISCONNECTED;
    } else if (message.id == HEARTBE