ESP8266当作TCP服务器，关于WIFI客户端连接数量问题求解

ESP8266当作TCP服务器，手机应用去连接，手机应用会重复连接，连接前会把之前的连接给断开，但是ESP8266的连接数一直在增加，当达到5个连接后，就再也不能连接通信了，现在的做法是，在ESP8266中把上一个连接断开，代码如下，但是不生效，帮忙看看哪有问题
static struct espconn led_wifi_conn;
static struct espconn *laster_wifi_conn;
static struct espconn *current_wifi_conn;
static esp_tcp led_wifi_tcp;
static uint8 led_tcp_dis;

// 此函数一直没有调用
static void led_wifi_disconnect_callback(void *arg)
{
        os_printf("led_wifi_disconnect_callbackn");
}

// 此函数一直没有调用
static void led_wifi_reconnect_callback(void *arg,sint8 err)
{
        os_printf("led_wifi_reconnect_callback err = %dn",err);
}

static void led_wifi_rev_callback(void *arg, char *pdata, unsigned short len)
{
        // os_printf("led_wifi_rev_callback led = %dn",len);
        UART1GetData(pdata,len);
}

static void led_wifi_send_callback(void *arg)
{
        // os_printf("led_wifi_send_callbackn");      
}

static void led_wifi_connect_callback(void *arg)
{
        struct espconn *conn;

        conn = (struct espconn *)arg;

        if ((unsigned int)arg == (unsigned int)&led_wifi_conn)
                os_printf("IS the samen");
        else
                os_printf("NOT the samen");
      
        os_printf("led_wifi_connect_callbackn");
        os_printf("conn->link_cnt = %dn",conn->link_cnt);
        os_printf("conn->state = %dn",conn->state);
        os_printf("current_wifi_conn = 0x%xn",(unsigned int)conn);
        current_wifi_conn = conn;
        led_tcp_dis       = 1;
        conn->proto.tcp = &led_wifi_tcp;
      
        espconn_regist_disconcb(conn,led_wifi_disconnect_callback);
        espconn_regist_reconcb(conn,led_wifi_reconnect_callback);
        espconn_regist_recvcb(conn, led_wifi_rev_callback);
        espconn_regist_sentcb(conn, led_wifi_send_callback);
}

static void led_wifi_build_tcp(void)
{
        // Build TCP server
        led_wifi_conn.type  = ESPCONN_TCP;
        led_wifi_conn.state = ESPCONN_NONE;
        led_wifi_conn.proto.tcp = &led_wifi_tcp;
        led_wifi_conn.proto.tcp->local_port = WIFI_SERVER_PORT;

        espconn_regist_connectcb(&led_wifi_conn,led_wifi_connect_callback);
        espconn_accept(&led_wifi_conn);
        // Set TCP alive 1800s
        espconn_regist_time(&led_wifi_conn,WIFI_TCP_TIME,1);
}

//
// Check if need disconnect TCP connect
// 此函数在一个任务中周期性调用，用来断开上一个连接
void LEDWifiProc(void)
{
        sint8 ret;
        if (0) {
                os_printf("LEDWifiProc = 0x%xn",(unsigned int)laster_wifi_conn);
                ret = espconn_disconnect(laster_wifi_conn);
                os_printf("disconnect ret = %dn",ret);
                ret = espconn_delete(laster_wifi_conn);
                os_printf("delete ret = %dn",ret);
                laster_wifi_conn = current_wifi_conn;
                led_tcp_dis = 0;
        }
}

sint8 led_wifi_send_data(uint8 *data,unsigned short len)
{
        if (data == NULL || len == 0)
                return -1;
      
        return espconn_send(&led_wifi_conn,data,len);
}

void IRAM_ATTR led_wifi_event_handle(System_Event_t *event)
{
        os_printf("led_wifi_event_handle evt = %dn",event->event_id);
}

void led_wifi_init(void)
{
        unsigned int ret;
        struct softap_config cfg;

        led_tcp_dis = 0;

        // WIFI mode init
        wifi_set_opmode(STATIONAP_MODE);

      
        // Set WIFI default name and password
        wifi_softap_get_config(&cfg);

        // Load device name save in flash
        // When new device,the softAP authmode will OPEN ?
        if (cfg.authmode != AUTH_WPA_WPA2_PSK || cfg.max_connection != 1) {
                sprintf(cfg.ssid,"%s",WIFI_DEFAULT_SSID);
                sprintf(cfg.password,"%s",WIFI_DEFAULT_PASSWD);      
        }
        cfg.authmode       = AUTH_WPA_WPA2_PSK;
        cfg.ssid_len       = 0;
        cfg.max_connection = 1;
        wifi_softap_set_config(&cfg);

        // wifi_set_event_handler_cb(led_wifi_event_handle);

        led_wifi_build_tcp();

        laster_wifi_conn  = &led_wifi_conn;
        current_wifi_conn = &led_wifi_conn;
        os_printf("led_wifi_conn = 0x%xn",(unsigned int)&led_wifi_conn);
}

串口打印LOG如下：
SDK version:1.3.0(68c9e7b)
led_wifi_conn = 0x3fff044c
mode : sta(5c:cf:7f:12:65:42) + softAP(5e:cf:7f:12:65:42)
add if0
dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
add if1
bcn 100
add 1
aid 1
station: 68:3e:34:61:d5:61 join, AID = 1
NOT the same
led_wifi_connect_callback
conn->link_cnt = 0
conn->state = 3
current_wifi_conn = 0x3fffde20
espconn_server_close, close
NOT the same
led_wifi_connect_callback
conn->link_cnt = 1
conn->state = 3
current_wifi_conn = 0x3fffdcb0
espconn_server_close, close
NOT the same
led_wifi_connect_callback
conn->link_cnt = 2
conn->state = 3
current_wifi_conn = 0x3fffdd78
espconn_server_close, close
NOT the same
led_wifi_connect_callback
conn->link_cnt = 3
conn->state = 3
current_wifi_conn = 0x3fffdf58
espconn_server_close, close
NOT the same
led_wifi_connect_callback
conn->link_cnt = 4
conn->state = 3
current_wifi_conn = 0x3fffdf28
espconn_server_close, close


当conn->link_cnt = 4后，再也不能连接，不管LEDWifiProc有没有执行disconnect，都没用