好吧，我找到了一个解决方案，我有一个错误的处理输入数据。数据必须像这样解码：

int rxDataLen = 0;
char rxBuf[rxBufferSize];
char selectedObject;
int16_t controlledValue;
WH_Status_t ret = OK;
uint8_t k = 0;

char rxBuf[rxBufferSize];
int rx_data_len = recv (comSockId, (void *)rxBuf, rxBufferSize, MSG_DONTWAIT);
        // Has a new WebSocket message have been received
        if (rx_data_len > 0) {
            rxBuf[rx_data_len] = '\0';
            // Is the message a handshake request
            if (strncmp(rxBuf, "GET", 3) == 0) {
                printf("%s\n", rxBuf);
                // Yes -> create the handshake response and send it back
                char response[WS_HS_ACCLEN];
                get_handshake_response(rxBuf, response);
                send(comSockId, (void *)response, strlen(response), 0);
                printf("Handshake done\n");
            }
            else {
                /* No -> decode incoming message,
                process the command and
                send back an acknowledge message */
                char command[rx_data_len];
                decode_incoming_request(rxBuf, command);
                command[strlen(command)] = '\0';

                /* Check, if the website has been closed. */
                if (strncmp(command, "close", 5) == 0){
                    printf("Cliend closed connection.\n");
                    return closeClient;
                }

                // Decode the message string to control the webhouse.
                analyseMessage((char*)&command, &selectedObject, &controlledValue);

                char response[6] = {0};
                sendMessage((char*)&(response), &selectedObject, actualTemperature, alarmState);
                printf("Answer: %s\n", response);
                char codedResponse[strlen(response)+1];
                code_outgoing_response (response, codedResponse);
                send(comSockId, (void *)codedResponse,
                strlen(codedResponse), 0);
            }
        }

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当一个连接处于活动状态时，你必须在这个代码行中循环，直到连接关闭或者你从服务器端关闭它。这样，就不会再有无效的帧头了。