void hl_tcp_sync_srv(void)
 {
     vm_ip_address_t addr;
     VMINT ret;
     char buf[1024] = {0};
     VMINT hdl_c;
     VMINT hdl_s = vm_tcp_server_init_sync(1, 3500);
     hdl_c = vm_tcp_server_accept_sync(hdl_s, &addr);
     ret = vm_tcp_server_read_sync(hdl_c, buf, 1024);
     ret = vm_tcp_server_write_sync(hdl_c, "aaa", 3);
     vm_tcp_server_close_client_sync(hdl_c);
     vm_tcp_server_release_sync(hdl_s);
 }