rc=20 > Connect to SAP gateway failed

本文介绍了一种在用户电脑上遇到的与ComputerName相关的错误及其简单解决方案:将ComputerName更改为英文。

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这种错误,我是在一台用户的电脑上碰到的,解决方案很简单:把Computer Name换成英文...

汗了许久。偷笑

Error Occurred – What to do? ................................................................................................ 1 Error Log ............................................................................................................................ 1 Error Context ..................................................................................................................... 2 Replay the Error in Gateway Client .................................................................................... 3 Gateway Client ...................................................................................................................... 6 HTTP Requests and Responses ........................................................................................ 6 Database Integration: Working with Test Cases ................................................................. 7 Interpreting the Test Results .............................................................................................. 8 HTML Status Codes .............................................................................................................. 9 Successful 2xx ................................................................................................................... 9 Client Error 4xx .................................................................................................................. 9 Server Error 5xx ................................................................................................................11 Possible Approaches ............................................................................................................12 Error resolution with Application Log / IMG and replay ......................................................12 Error resolution in the Service Registry and replay ...........................................................13 Error resolution in the coding and replay ...........................................................................14 Error localization and replay ..............................................................................................15 Request XML in a problem ticket for Error Resolution at SAP ...........................................16 Error resolution in the Backend Coding and replay ...........................................................17 Documentation .....................................................................................................................18
### 解决方案分析 `MQTTAsync_waitForCompletion` 函数返回错误代码 `-3` 表明存在某种异常情况。通常情况下,该错误可能与以下因素有关: #### 1. **连接状态** 如果客户端尚未建立有效的连接,则调用 `MQTTAsync_waitForCompletion` 可能会触发此错误。确保在执行任何异步操作之前已成功完成连接过程[^5]。 ```c int rc; MQTTAsync client; MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer; // 初始化并设置连接选项 conn_opts.keepAliveInterval = 20; conn_opts.cleansession = 1; rc = MQTTAsync_create(&client, "tcp://localhost:1883", "ClientID"); if (rc != MQTTASYNC_SUCCESS) { printf("Failed to create client object\n"); } rc = MQTTAsync_connect(client, &conn_opts); if (rc != MQTTASYNC_SUCCESS) { printf("Failed to start connect, return code %d\n", rc); } ``` 上述代码片段展示了如何初始化和创建一个 MQTT 客户端实例,并尝试与其服务器建立连接。只有当连接成功时才能继续其他操作[^6]。 #### 2. **消息传递机制中的问题** 另一个常见原因是发送的消息未能被正确处理或确认收到。这可能是由于网络延迟、超时设定不当或者目标主题不存在等原因造成的。可以通过调整参数来优化性能表现[^7]: - 延长等待时间以适应较慢的响应速度; - 检查所使用的 QoS 级别是否合适; 以下是修改后的示例程序部分: ```c MQTTAsync_message pubmsg = MQTTAsync_message_initializer; MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer; pubmsg.payload = "Test Message"; pubmsg.payloadlen = strlen(pubmsg.payload); pubmsg.qos = 1; // 使用至少一次交付(Quality Of Service Level 1) pubmsg.retained = 0; opts.onSuccess = onPublishSuccess; opts.context = NULL; rc = MQTTAsync_sendMessage(client, "/test/topic", &pubmsg, &opts); if (rc != MQTTASYNC_SUCCESS){ fprintf(stderr,"Send message failed with reason code:%d\n",rc ); } else{ printf("Waiting for completion...\n"); int result=MQTTAsync_waitForCompletion(sendToken ,10000 );// 设置更长时间限值如十秒 if(result<0 ){ perror("Error during wait "); } } ``` 在此基础上还应考虑增加日志记录功能以便于调试过程中发现问题所在之处[^8]。 --- ### 总结建议 综上所述,针对当前遇到的情况可以从以下几个方面入手排查原因并采取相应措施加以改进: - 验证整个通信流程里每一步骤都顺利完成无误后再进入下一步动作。 - 对现有环境配置重新审视是否存在不匹配项影响正常运作效果。 - 加强监控力度及时捕捉潜在隐患提前预防故障发生几率提升系统稳定性可靠性水平。
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