Question

我是Microchip的TCP / IP堆栈的新手，我已经在Harmony文件夹中的一些示例的帮助下成功创建了我自己的基本TCP服务器。我想扩展我的TCP服务器以满足同一端口上的多个客户端连接，但我不完全确定最好的方法。

以下是我的基本服务器应用程序的信息。

void TCP_SERVER_Tasks ( void )
{
//Handle for the network interface
static TCPIP_NET_HANDLE networkInterfaceHandle;

//IP Address assigned to DHCP Client
static IPV4_ADDR hostIPAddress;

//Handle for TCP Client
static TCP_SOCKET TCPSocketHandle = INVALID_SOCKET;

//System Timer Tick Values
static uint32_t statusRequestTick;
static uint32_t timeoutTick;

//Temporary Buffer for Storage of received UDP/TCP Data
uint8_t receivedDataBuffer[128];
uint16_t numberDataBytesToProcess;

//Check if the network interface has become disconnected.
//Close any open sockets, and goto NETWORKCOMS_STATE_INIT state
if (tcp_serverData.state > NETWORKCOMS_STATE_WAIT_FOR_LINK &&
    TCPIP_STACK_NetIsLinked(networkInterfaceHandle) == false)
{
    if (TCPSocketHandle != INVALID_SOCKET)
    {
        //Close the Open TCP Socket
        TCPIP_TCP_Close(TCPSocketHandle);
        TCPSocketHandle = INVALID_SOCKET;
    }

    tcp_serverData.state = NETWORKCOMS_STATE_WAIT_FOR_LINK;
}

/* Check the application's current state. */
switch ( tcp_serverData.state )
{
    /* Application's initial state. */
    case TCP_SERVER_STATE_INIT:
    {
        //Wait for the TCPIP Stack and System Timer Service to become initialized
        if (TCPIP_STACK_Status(sysObj.tcpip) == SYS_STATUS_READY &&
            SYS_TMR_Status(sysObj.sysTmr) == SYS_STATUS_READY)
        {
            if (TCPIP_STACK_NumberOfNetworksGet() > 0)
            {
                //Get a handle to the network interface
                //For this application only one interface is used
                networkInterfaceHandle = TCPIP_STACK_IndexToNet(0);
            }

            timeoutTick = SYS_TMR_TickCountGet();
            tcp_serverData.state = NETWORKCOMS_STATE_WAIT_FOR_LINK;
        }

        break;
    }

    case NETWORKCOMS_STATE_WAIT_FOR_LINK:
    {
        //Determine if the network interface is connected
        if (TCPIP_STACK_NetIsLinked(networkInterfaceHandle))
        {
            //Check if a DHCP Server can be found on the network
            if (TCPIP_DHCP_IsBound(networkInterfaceHandle))
            {
                hostIPAddress.Val = TCPIP_STACK_NetAddress(networkInterfaceHandle);
                tcp_serverData.state = NETWORKCOMS_SETUP_TCP_SERVER;

            }

        }

        break;
    }

    case NETWORKCOMS_SETUP_TCP_SERVER:
    {
        //Setup the TCP Server on the port defined by the TCP_SERVER_PORT constant.
        //Store the returned socket handle in the TCPSocketHandle variable.

        TCPSocketHandle = TCPIP_TCP_ServerOpen(IP_ADDRESS_TYPE_IPV4, TCP_SERVER_PORT, 0);

        // Verify that the socket opened correctly
        if (TCPSocketHandle != INVALID_SOCKET )
        {
            tcp_serverData.state = NETWORK_WAIT_FOR_CONNECTION;
        }
        break;
    }

    case NETWORK_WAIT_FOR_CONNECTION:
    {
        // Periodically check to see if a Client has connected
        if( TCPIP_TCP_IsConnected(TCPSocketHandle) )
        {
            tcp_serverData.state = NETWORK_SERVICE_CONNECTION;
        }
        break;
    }

    case NETWORK_SERVICE_CONNECTION:
    {
        // Make sure that the connection is still available
        if ( !TCPIP_TCP_IsConnected(TCPSocketHandle) )
        {
            tcp_serverData.state = NETWORK_WAIT_FOR_CONNECTION;

        }

        else
        {
            if ( TCPIP_TCP_PutIsReady(TCPSocketHandle) > 10 )
            {
                TCPIP_TCP_StringPut(TCPSocketHandle, "HELLO!!\r\n\0");
            }

            tcp_serverData.state = NETWORK_CLOSE_CONNECTION;
        }
        break;
    }

    case NETWORK_CLOSE_CONNECTION:
    {
        TCPIP_TCP_Close(TCPSocketHandle);

        tcp_serverData.state = NETWORKCOMS_SETUP_TCP_SERVER;
        break;
    }


    /* The default state should never be executed. */
    default:
    {
        /* TODO: Handle error in application's state machine. */
        break;
    }
  }
}
 `

现在如果端口上有连接，代码会以HELLO响应！然后关闭连接。

在我开始更改代码以服务多个客户端之前，我需要一些澄清。在开始接受多个客户端之前，我是否需要将服务器套接字绑定到本地地址？为什么？

我是否可以将位于Harmony文件夹中的Berkley_Server示例用作如何构建具有多个客户端访问权限的常规TCP服务器的通用模板？

非常感谢任何澄清或见解。

MPLab Harmony为多个客户提供服务

0 个答案: