问腾旭云一发送指令，设备就离线了?

    // 测试代码
    delay_ms(1000);
    delay_ms(1000);
    delay_ms(1000);
    delay_ms(1000);
    
    sprintf((char*)gString,"AT+CWJAP=\"%s\",\"%s\"\r\n",WIFINAME,WIFIPASSWORD);
    USART_Send(UART1,gString);
    
    delay_ms(1000);
    delay_ms(1000);
    
    sprintf((char*)gString,"AT+TCMQTTCONN=1,5000,240,0,1\r\n");
    USART_Send(UART1,gString);
    
    delay_ms(1000);
    delay_ms(1000);
    
    sprintf((char*)gString,"AT+TCMQTTSUB=\"$thing/down/property/%s/%s\",0\r\n",PRODUCTID,DEVICENAME);
    USART_Send(UART1,gString);
    
    delay_ms(1000);
    delay_ms(1000);