为什么LWIP+ENC60J在回调函数中发数据发送变量多了不行但常量再多也可以？

原子哥：
LWIP+ENC60J+STM32(MINI)V3.0
发送回调函数中，发送变量多了不行，常量再多也可以，在论坛中都没发现过讨论这个问题的，
注释掉的发15个就有接收不到的，常量发90个可以，
我的项目是把TCP/IP，网关，掩码发给上位机显示，而后，手工配置TCP/IP,网关，掩码等
代码如下：
err_t tcp_client_poll(void *arg, struct tcp_PCB *tpcb)
{
u8 i=0;
err_t ret_err;
struct tcp_client_struct *es;
es=(struct tcp_client_struct*)arg;
if(es!=NULL)  //????????????????·???????
{
if(tcp_client_sta&(1<<7))//??????·?????????·???
{
memset(tcp_udp_demo_sendbuf,0,TCP_UDP_DEMO_TX_BUFSIZE);  //????·???????????0
if(key_flag)       //·?????????????????????
{
  tcp_udp_demo_sendbuf[0]=0x0a;
  tcp_udp_demo_sendbuf[1]=0x0b;
  tcp_udp_demo_sendbuf[2]=0x0c;
  tcp_udp_demo_sendbuf[3]=0x0d;
  tcp_udp_demo_sendbuf[4]=0x0e;
key_flag=0;
}
if( read_ip_ok)  //±à??×???·???IP????????±à???í??
{
//    tcp_udp_demo_sendbuf[0]=NET_ID_FLG;
//    tcp_udp_demo_sendbuf[1]=eeprom_net_num[0];        //??????
//    tcp_udp_demo_sendbuf[2]=eeprom_net_num[1];
//    tcp_udp_demo_sendbuf[3]=eeprom_net_num[2];
//      tcp_udp_demo_sendbuf[1]=USER_ID_FLG;
//tcp_udp_demo_sendbuf[5]=eeprom_user_id[0];       //???§????
//   tcp_udp_demo_sendbuf[6]=eeprom_user_id[1];
//   tcp_udp_demo_sendbuf[7]=eeprom_user_id[2];
//  tcp_udp_demo_sendbuf[8]=eeprom_user_id[3];
//    tcp_udp_demo_sendbuf[2]=REMOTEIP_FLG;
//tcp_udp_demo_sendbuf[3]=lwipdev.remoteip[0];       //????IP
//  tcp_udp_demo_sendbuf[4]=lwipdev.remoteip[1];
  // tcp_udp_demo_sendbuf[5]=lwipdev.remoteip[2];
//  tcp_udp_demo_sendbuf[6]=lwipdev.remoteip[3];
//   tcp_udp_demo_sendbuf[3]=HEREIP_FLG;
//tcp_udp_demo_sendbuf[4]=lwipdev.ip[0];            //±???IP
//   tcp_udp_demo_sendbuf[5]=lwipdev.ip[1];
//   tcp_udp_demo_sendbuf[6]=lwipdev.ip[2];
//   tcp_udp_demo_sendbuf[7]=lwipdev.ip[3];
//   tcp_udp_demo_sendbuf[8]=NETMASK_FLG;
//tcp_udp_demo_sendbuf[9]=lwipdev.netmask[0];      //×???????
//   tcp_udp_demo_sendbuf[10]=lwipdev.netmask[1];
//    tcp_udp_demo_sendbuf[11]=lwipdev.netmask[2];
//    tcp_udp_demo_sendbuf[12]=lwipdev.netmask[3];
//   tcp_udp_demo_sendbuf[13]=GATWAY_FLG;
//tcp_udp_demo_sendbuf[14]=lwipdev.gateway[0];     //????????
//   tcp_udp_demo_sendbuf[15]=lwipdev.gateway[1];
//   tcp_udp_demo_sendbuf[16]=lwipdev.gateway[2];
//   tcp_udp_demo_sendbuf[17]=lwipdev.gateway[3];
//   tcp_udp_demo_sendbuf[22]=TCP_UDP_PORT_FLG;
  tcp_udp_demo_sendbuf[0]=0x0a;
  tcp_udp_demo_sendbuf[1]=0x0b;
tcp_udp_demo_sendbuf[2]=0x0b;
  tcp_udp_demo_sendbuf[3]=0x0c;
  tcp_udp_demo_sendbuf[4]=0x0d;
  tcp_udp_demo_sendbuf[5]=0x0e;
tcp_udp_demo_sendbuf[6]=0x0a;
  tcp_udp_demo_sendbuf[7]=0x0b;
  tcp_udp_demo_sendbuf[8]=0x0c;
  tcp_udp_demo_sendbuf[9]=0x0d;
  tcp_udp_demo_sendbuf[10]=0x0e;
tcp_udp_demo_sendbuf[11]=0x0a;
  tcp_udp_demo_sendbuf[12]=0x0b;
  tcp_udp_demo_sendbuf[13]=0x0c;
  tcp_udp_demo_sendbuf[14]=0x0d;
  tcp_udp_demo_sendbuf[15]=0x0e;
tcp_udp_demo_sendbuf[16]=0x0a;
  tcp_udp_demo_sendbuf[17]=0x0b;
  tcp_udp_demo_sendbuf[18]=0x0c;
  tcp_udp_demo_sendbuf[19]=0x0d;
  tcp_udp_demo_sendbuf[20]=0x0e;
tcp_udp_demo_sendbuf[21]=0x0a;
  tcp_udp_demo_sendbuf[22]=0x0b;
  tcp_udp_demo_sendbuf[23]=0x0c;
  tcp_udp_demo_sendbuf[24]=0x0d;
  tcp_udp_demo_sendbuf[25]=0x0e;
tcp_udp_demo_sendbuf[26]=0x0c;
  tcp_udp_demo_sendbuf[27]=0x0d;
  tcp_udp_demo_sendbuf[28]=0x0e;
tcp_udp_demo_sendbuf[29]=0x0a;
  tcp_udp_demo_sendbuf[30]=0x0b;
  tcp_udp_demo_sendbuf[31]=0x0c;
  tcp_udp_demo_sendbuf[32]=0x0d;
  tcp_udp_demo_sendbuf[33]=0x0e;
tcp_udp_demo_sendbuf[34]=0x0c;
  tcp_udp_demo_sendbuf[35]=0x0d;
  tcp_udp_demo_sendbuf[36]=0x0e;
tcp_udp_demo_sendbuf[37]=0x0c;
  tcp_udp_demo_sendbuf[38]=0x0d;
  tcp_udp_demo_sendbuf[39]=0x0e;
tcp_udp_demo_sendbuf[40]=0x0a;
  tcp_udp_demo_sendbuf[41]=0x0b;
  tcp_udp_demo_sendbuf[42]=0x0c;
  tcp_udp_demo_sendbuf[43]=0x0d;
  tcp_udp_demo_sendbuf[44]=0x0e;
tcp_udp_demo_sendbuf[45]=0x0a;
  tcp_udp_demo_sendbuf[46]=0x0b;
tcp_udp_demo_sendbuf[47]=0x0b;
  tcp_udp_demo_sendbuf[48]=0x0c;
  tcp_udp_demo_sendbuf[49]=0x0d;
  tcp_udp_demo_sendbuf[50]=0x0e;
tcp_udp_demo_sendbuf[51]=0x0a;
  tcp_udp_demo_sendbuf[52]=0x0b;
  tcp_udp_demo_sendbuf[53]=0x0c;
  tcp_udp_demo_sendbuf[54]=0x0d;
  tcp_udp_demo_sendbuf[55]=0x0e;
tcp_udp_demo_sendbuf[56]=0x0a;
  tcp_udp_demo_sendbuf[57]=0x0b;
  tcp_udp_demo_sendbuf[58]=0x0c;
  tcp_udp_demo_sendbuf[59]=0x0d;
  tcp_udp_demo_sendbuf[60]=0x0e;
tcp_udp_demo_sendbuf[61]=0x0a;
  tcp_udp_demo_sendbuf[62]=0x0b;
  tcp_udp_demo_sendbuf[63]=0x0c;
  tcp_udp_demo_sendbuf[64]=0x0d;
  tcp_udp_demo_sendbuf[65]=0x0e;
tcp_udp_demo_sendbuf[66]=0x0a;
  tcp_udp_demo_sendbuf[67]=0x0b;
  tcp_udp_demo_sendbuf[68]=0x0c;
  tcp_udp_demo_sendbuf[69]=0x0d;
  tcp_udp_demo_sendbuf[70]=0x0e;
tcp_udp_demo_sendbuf[71]=0x0c;
  tcp_udp_demo_sendbuf[72]=0x0d;
  tcp_udp_demo_sendbuf[73]=0x0e;
tcp_udp_demo_sendbuf[74]=0x0a;
  tcp_udp_demo_sendbuf[75]=0x0b;
  tcp_udp_demo_sendbuf[76]=0x0c;
  tcp_udp_demo_sendbuf[77]=0x0d;
  tcp_udp_demo_sendbuf[78]=0x0e;
tcp_udp_demo_sendbuf[79]=0x0c;
  tcp_udp_demo_sendbuf[80]=0x0d;
  tcp_udp_demo_sendbuf[81]=0x0e;
tcp_udp_demo_sendbuf[82]=0x0c;
  tcp_udp_demo_sendbuf[83]=0x0d;
  tcp_udp_demo_sendbuf[84]=0x0e;
tcp_udp_demo_sendbuf[85]=0x0a;

   
tcp_udp_demo_sendbuf[86]=tcp_client_porth;      //这个能接收到，
   tcp_udp_demo_sendbuf[87]=tcp_client_portl;        //这个能接收到，
   tcp_udp_demo_sendbuf[88]=udp_porth;            //这里就收不到了
   tcp_udp_demo_sendbuf[89]=udp_portl;                //这里也收不到了
LCD_ShowString(30,270,200,16,16,"send ok");
readip_send_ok=1;
read_ip_ok=0;
}
es->p=pbuf_alloc(PBUF_TRANSPORT, strlen((char*)tcp_udp_demo_sendbuf),PBUF_POOL);//?ê??????
pbuf_take(es->p,(char*)tcp_udp_demo_sendbuf,strlen((char*)tcp_udp_demo_sendbuf));//??tcp_udp_demo_sentbuf[]
                                                                                 //??????????±???es->p_tx??
tcp_client_senddata(tpcb,es);//??tcp_udp_demo_sentbuf[]??????????pbuf??????·???????
tcp_client_sta&=~(1<<7);//????????·???±ê??
if(es->p)pbuf_free(es->p);//??·?????
}else if(es->state==ES_TCPCLIENT_CLOSING)
{
tcp_client_connection_close(tpcb,es);//??±?TCP????
}
ret_err=ERR_OK;
}else
{
tcp_abort(tpcb);//????????,????pcb?????é
ret_err=ERR_ABRT;
}
return ret_err;
}