void hl_tcp_conn_cb(VM_TCP_HANDLE handle, VM_TCP_EVENT event)
 {
     char buf[100];
     VMINT nread, nwrite;
     switch (event)
     {
         case VM_TCP_EVENT_CONNECTED:
             nwrite = vm_tcp_write(
                         handle,
                         "GET www.mediatek.com HTTP/1.1rnHost: www.mediatek.comrnrn",
                         strlen("GET www.mediatek.com HTTP/1.1rnHost: www.mediatek.comrnrn"));
             break;
         case VM_TCP_EVENT_CAN_READ:
             memset(buf, 0, 100);
             nread = vm_tcp_read(handle, buf, 100);
             vm_tcp_close(handle);
             return;
         default:
             return;
     }
     return;
 }