动态DNS代码错误

我最近刚开始使用HARMony和MPLLABX，因为我用MPLAB 8编译和使用TCPIP堆栈v5x的项目已经工作了两年，所以Goggle停止接受SSL连接。我试过添加Wolf SSL，但是无法工作，所以我决定尝试MPLAB X和Harmony。我花了几天试图让他们工作，我决定把SD卡和USB的旧MLA代码移植到我的和谐项目中。在移植它上花了几个小时之后，令人惊讶，令人惊讶——MLA代码没有任何问题地工作。最后要做的是让DDNS工作。再一次，我花了几个小时来弄清楚它为什么不工作——IP地址已经改变，我一直有一个状态DDNS_STATUS_UNCHANGED，不需要更新（在ddns.c中）以下是来自ddns.c的代码的一部分。从情况SM_CHECKIP_FIND_ADDRESS:，如果找到IP地址，代码直接进入情况SM_CHECKIP_DISCONNECT:，而不增加smDDNS。SMDDN增加。代码中的注释是-需要执行更新-即，我们应该到达情况SM_IP_UPDATE_HOME:。但是当smDDNS增加时，它将从SM_CHECKIP_FIND_ADDRESS更改为SM_CHECKIP_DISCONNECT，而不是SM_IP_UPDATE_HOME。这意味着在下一次运行任务时，我们以caseSM_CHECKIP_DISCONNECT结束，lastKnownIP等于ipParsed，我们返回SM_DONE——不需要更新！！！！我的问题的解决方案（除非我漏掉了什么东西）是在SM_CHECKIP_FIND_ADDRESS,smDDNS++的情况下添加。我希望这会帮助具有相同问题的人——除非我错了，并且代码应该正常工作？



      以下为原文

    , I have started recently with Harmony and MPLAB X because my project that worked for a couple of years compiled with MPLAB 8 and using TCPIP stack v5xx stopped working - Goggle stopped accepting SSL connection. I have tried adding Wolf SSL but I couldn't get it to work so I decided to try MPLAB X and Harmony.
An example of an app provided with Harmony, using Wolf SSL worked so there was a hope that I can get my project converted (re-done).
After a lot of struggle, and giving up on SD Card and USB Host drivers from Harmony - I spent a couple of days trying to get them working I have decided to port old MLA code for SD Card and USB to my Harmony project. And after a couple of hours spent on porting it, surprise, surprise - MLA code works without any problems.
The last thing to do was to get DDNS working. And again, I have spent a couple of hours to figure out why it doesn't work - IP address has changed and I always had a status DDNS_STATUS_UNCHANGED, no update required (in ddns.c)
Below is part of the code from ddns.c
            smDDNS++;
        case SM_CHECKIP_FIND_ADDRESS:
            // Check if remote node is still connected. If not, force to the disconnect state,
            // but don't break because data may still be waiting.
            if(!TCPIP_TCP_IsConnected(MySocket) || SYS_TMR_TickCountGet() - DDnsTimer > 6*SYS_TMR_TickCounterFrequencyGet())
                smDDNS = SM_CHECKIP_DISCONNECT;
            // Search out the "" delimiter in the response
            wPos = TCPIP_TCP_ArrayFind(MySocket, (const uint8_t*)"", 7, 0, 0, false);
            // If not yet found, break
            if(wPos == 0xffff)
                break;
            // Read and terminate that string as the IP address (preventing buffer overflows)
            if(wPos > 15u)
                wPos = 15;
            TCPIP_TCP_ArrayGet(MySocket, vBuffer, wPos);
            vBuffer[wPos] = '';
            // Parse the IP address that was read, invalidating on failure
            if(!TCPIP_Helper_StringToIPAddress((char*)vBuffer, &ipParsed))
                vBuffer[0] = '';
            // Continue on to close the socket

        case SM_CHECKIP_DISCONNECT:
            // Close the socket
            TCPIP_TCP_Close(MySocket);
            MySocket = INVALID_SOCKET;

            // Determine if an update is necessary
            if(vBuffer[0] == '')
            {// CheckIP Failed
                lastStatus = DDNS_STATUS_CHECKIP_ERROR;
                smDDNS = SM_SOFT_ERROR;
                break;
            }

            if( (ipParsed.Val ==lastKnownIP.Val) && (!bForceUpdate))
            {
                // IP address has not changed and no update is forced
                lastStatus = DDNS_STATUS_UNCHANGED;
                smDDNS = SM_DONE;
                break;
            }

            // Need to perform an update
            lastKnownIP = ipParsed;
            bForceUpdate = false;
            smDDNS++;
            break;

        case SM_IP_UPDATE_HOME:

            netH = TCPIP_STACK_NetDefaultGet();

            // resolve the remote update server

Looking in the code, I saw that there is no chance to get to the  case SM_IP_UPDATE_HOME, and have ddns updated.
From the case SM_CHECKIP_FIND_ADDRESS:, if the IP address is found, the code goes straight into case SM_CHECKIP_DISCONNECT:, without increasing smDDNS.
In  case SM_CHECKIP_DISCONNECT:, if the ipParsed in not equal to lastKnownIP, the lastKnownIP is assigned new value and smDDNS is increased. The comment in the code is - Need to perform an update - i.e. we should get to case SM_IP_UPDATE_HOME:.
But when smDDNS is increased it is changed from SM_CHECKIP_FIND_ADDRESS to SM_CHECKIP_DISCONNECT and not to SM_IP_UPDATE_HOME. This means that on the next run of the task we end up in case SM_CHECKIP_DISCONNECT, lastKnownIP is equal to ipParsed and we go back to SM_DONE - no update required!!!.

My solution to my problem (unless I missed something) was to add in case SM_CHECKIP_FIND_ADDRESS, smDDNS++.
I hope that this will help someone who has the same problem - unless I am wrong and the code should work as it is?