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nodemcu-firmware/app/lwip/app/espconn_tcp.c

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/******************************************************************************
* Copyright 2013-2014 Espressif Systems (Wuxi)
*
* FileName: espconn_tcp.c
*
* Description: tcp proto interface
*
* Modification history:
* 2014/3/31, v1.0 create this file.
*******************************************************************************/
#include "lwip/netif.h"
#include "lwip/inet.h"
#include "netif/etharp.h"
#include "lwip/tcp.h"
#include "lwip/ip.h"
#include "lwip/init.h"
#include "lwip/tcp_impl.h"
#include "lwip/memp.h"
#include "ets_sys.h"
#include "os_type.h"
//#include "os.h"
#include "lwip/mem.h"
#include "lwip/app/espconn_tcp.h"
#ifdef MEMLEAK_DEBUG
static const char mem_debug_file[] ICACHE_RODATA_ATTR = __FILE__;
#endif
extern espconn_msg *plink_active;
extern espconn_msg *pserver_list;
extern struct espconn_packet pktinfo[2];
extern struct tcp_pcb ** const tcp_pcb_lists[];
os_event_t espconn_TaskQueue[espconn_TaskQueueLen];
static err_t
espconn_client_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
static void
espconn_client_close(void *arg, struct tcp_pcb *pcb,u8 type);
static err_t
espconn_server_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
static void
espconn_server_close(void *arg, struct tcp_pcb *pcb,u8 type);
///////////////////////////////common function/////////////////////////////////
/******************************************************************************
* FunctionName : espconn_kill_oldest
* Description : kill the oldest TCP block
* Parameters : none
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_kill_oldest(void)
{
struct tcp_pcb *pcb, *inactive;
u32_t inactivity;
inactivity = 0;
inactive = NULL;
/* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
for (pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
if ((u32_t) (tcp_ticks - pcb->tmr) >= inactivity) {
inactivity = tcp_ticks - pcb->tmr;
inactive = pcb;
}
}
if (inactive != NULL) {
tcp_abort(inactive);
}
/* Go through the list of FIN_WAIT_2 pcbs and get the oldest pcb. */
inactivity = 0;
inactive = NULL;
for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
if (pcb->state == FIN_WAIT_1 || pcb->state == FIN_WAIT_2){
if ((u32_t) (tcp_ticks - pcb->tmr) >= inactivity) {
inactivity = tcp_ticks - pcb->tmr;
inactive = pcb;
}
}
}
/*Purges the PCB, removes it from a PCB list and frees the memory*/
if (inactive != NULL) {
tcp_pcb_remove(&tcp_active_pcbs, inactive);
memp_free(MEMP_TCP_PCB, inactive);
}
/* Go through the list of LAST_ACK pcbs and get the oldest pcb. */
inactivity = 0;
inactive = NULL;
for (pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
if (pcb->state == LAST_ACK) {
if ((u32_t) (tcp_ticks - pcb->tmr) >= inactivity) {
inactivity = tcp_ticks - pcb->tmr;
inactive = pcb;
}
}
}
/*Purges the PCB, removes it from a PCB list and frees the memory*/
if (inactive != NULL) {
tcp_pcb_remove(&tcp_active_pcbs, inactive);
memp_free(MEMP_TCP_PCB, inactive);
}
}
/******************************************************************************
* FunctionName : espconn_kill_oldest_pcb
* Description : find the oldest TCP block by state
* Parameters : none
* Returns : none
*******************************************************************************/
void ICACHE_FLASH_ATTR espconn_kill_oldest_pcb(void)
{
struct tcp_pcb *cpcb = NULL;
uint8 i = 0;
uint8 num_tcp_fin = 0;
for(i = 2; i < 4; i ++){
for (cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
if (cpcb->state == TIME_WAIT){
num_tcp_fin ++;
if (num_tcp_fin == MEMP_NUM_TCP_PCB)
break;
}
if (cpcb->state == FIN_WAIT_1 || cpcb->state == FIN_WAIT_2 || cpcb->state == LAST_ACK){
num_tcp_fin++;
if (num_tcp_fin == MEMP_NUM_TCP_PCB)
break;
}
}
if (num_tcp_fin == MEMP_NUM_TCP_PCB){
num_tcp_fin = 0;
espconn_kill_oldest();
} else if (cpcb == NULL){
num_tcp_fin = 0;
}
}
}
/******************************************************************************
* FunctionName : espconn_kill_pcb
* Description : kill all the TCP block by port
* Parameters : none
* Returns : none
*******************************************************************************/
void ICACHE_FLASH_ATTR espconn_kill_pcb(u16_t port)
{
struct tcp_pcb *cpcb = NULL;
uint8 i = 0;
struct tcp_pcb *inactive = NULL;
struct tcp_pcb *prev = NULL;
u8_t pcb_remove;
/* Check if the address already is in use (on all lists) */
for (i = 1; i < 4; i++) {
cpcb = *tcp_pcb_lists[i];
while(cpcb != NULL){
pcb_remove = 0;
if (cpcb->local_port == port) {
++pcb_remove;
}
/* If the PCB should be removed, do it. */
if (pcb_remove) {
/* Remove PCB from tcp_pcb_lists list. */
inactive = cpcb;
cpcb = inactive->next;
tcp_pcb_remove(tcp_pcb_lists[i], inactive);
memp_free(MEMP_TCP_PCB, inactive);
} else {
cpcb = cpcb->next;
}
}
}
}
/******************************************************************************
* FunctionName : espconn_find_current_pcb
* Description : find the TCP block which option
* Parameters : pcurrent_msg -- the node in the list which active
* Returns : TCP block point
*******************************************************************************/
struct tcp_pcb *ICACHE_FLASH_ATTR espconn_find_current_pcb(espconn_msg *pcurrent_msg)
{
uint16 local_port = pcurrent_msg->pcommon.local_port;
uint32 local_ip = pcurrent_msg->pcommon.local_ip;
uint16 remote_port = pcurrent_msg->pcommon.remote_port;
uint32 remote_ip = *((uint32*)&pcurrent_msg->pcommon.remote_ip);
struct tcp_pcb *find_pcb = NULL;
if (pcurrent_msg ->preverse == NULL){/*Find the server's TCP block*/
if (local_ip == 0|| local_port == 0) return pcurrent_msg->pcommon.pcb;
for (find_pcb = tcp_active_pcbs; find_pcb != NULL; find_pcb = find_pcb->next){
if ((find_pcb->remote_port == remote_port) && (find_pcb->remote_ip.addr == remote_ip) &&
(find_pcb->local_port == local_port) && (find_pcb->local_ip.addr == local_ip))
return find_pcb;
}
for (find_pcb = tcp_tw_pcbs; find_pcb != NULL; find_pcb = find_pcb->next){
if ((find_pcb->remote_port == remote_port) && (find_pcb->remote_ip.addr == remote_ip) &&
(find_pcb->local_port == local_port) && (find_pcb->local_ip.addr == local_ip))
return find_pcb;
}
} else {/*Find the client's TCP block*/
if (remote_ip == 0|| remote_port == 0) return pcurrent_msg->pcommon.pcb;
for (find_pcb = tcp_active_pcbs; find_pcb != NULL; find_pcb = find_pcb->next){
if ((find_pcb->remote_port == remote_port) && (find_pcb->remote_ip.addr == remote_ip))
return find_pcb;
}
for (find_pcb = tcp_tw_pcbs; find_pcb != NULL; find_pcb = find_pcb->next){
if ((find_pcb->remote_port == remote_port) && (find_pcb->remote_ip.addr == remote_ip))
return find_pcb;
}
}
return NULL;
}
/******************************************************************************
* FunctionName : espconn_tcp_reconnect
* Description : reconnect with host
* Parameters : arg -- Additional argument to pass to the callback function
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_tcp_reconnect(void *arg)
{
espconn_msg *precon_cb = arg;
sint8 re_err = 0;
espconn_buf *perr_buf = NULL;
espconn_buf *perr_back = NULL;
espconn_kill_oldest_pcb();
if (precon_cb != NULL) {
struct espconn *espconn = precon_cb->preverse;
re_err = precon_cb->pcommon.err;
if (precon_cb->pespconn != NULL){
if (espconn != NULL){/*Process the server's message block*/
if (precon_cb->pespconn->proto.tcp != NULL){
espconn_copy_partial(espconn, precon_cb->pespconn);
espconn_printf("server: %d.%d.%d.%d : %d reconnection\n", espconn->proto.tcp->remote_ip[0],
espconn->proto.tcp->remote_ip[1],espconn->proto.tcp->remote_ip[2],
espconn->proto.tcp->remote_ip[3],espconn->proto.tcp->remote_port);
os_free(precon_cb->pespconn->proto.tcp);
precon_cb->pespconn->proto.tcp = NULL;
}
os_free(precon_cb->pespconn);
precon_cb->pespconn = NULL;
} else {/*Process the client's message block*/
espconn = precon_cb->pespconn;
espconn_printf("client: %d.%d.%d.%d : %d reconnection\n", espconn->proto.tcp->local_ip[0],
espconn->proto.tcp->local_ip[1],espconn->proto.tcp->local_ip[2],
espconn->proto.tcp->local_ip[3],espconn->proto.tcp->local_port);
}
}
/*to prevent memory leaks, ensure that each allocated is deleted*/
perr_buf = precon_cb->pcommon.pbuf;
while (perr_buf != NULL){
perr_back = perr_buf;
perr_buf = perr_back->pnext;
espconn_pbuf_delete(&precon_cb->pcommon.pbuf,perr_back);
os_free(perr_back);
perr_back = NULL;
}
os_bzero(&pktinfo[1], sizeof(struct espconn_packet));
os_memcpy(&pktinfo[1], (void*)&precon_cb->pcommon.packet_info, sizeof(struct espconn_packet));
os_free(precon_cb);
precon_cb = NULL;
if (espconn && espconn->proto.tcp && espconn->proto.tcp->reconnect_callback != NULL) {
espconn->proto.tcp->reconnect_callback(espconn, re_err);
}
} else {
espconn_printf("espconn_tcp_reconnect err\n");
}
}
/******************************************************************************
* FunctionName : espconn_tcp_disconnect
* Description : disconnect with host
* Parameters : arg -- Additional argument to pass to the callback function
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_tcp_disconnect_successful(void *arg)
{
espconn_msg *pdiscon_cb = arg;
sint8 dis_err = 0;
espconn_buf *pdis_buf = NULL;
espconn_buf *pdis_back = NULL;
espconn_kill_oldest_pcb();
if (pdiscon_cb != NULL) {
struct espconn *espconn = pdiscon_cb->preverse;
dis_err = pdiscon_cb->pcommon.err;
if (pdiscon_cb->pespconn != NULL){
struct tcp_pcb *pcb = NULL;
if (espconn != NULL){/*Process the server's message block*/
if (pdiscon_cb->pespconn->proto.tcp != NULL && espconn->proto.tcp){
espconn_copy_partial(espconn, pdiscon_cb->pespconn);
espconn_printf("server: %d.%d.%d.%d : %d disconnect\n", espconn->proto.tcp->remote_ip[0],
espconn->proto.tcp->remote_ip[1],espconn->proto.tcp->remote_ip[2],
espconn->proto.tcp->remote_ip[3],espconn->proto.tcp->remote_port);
os_free(pdiscon_cb->pespconn->proto.tcp);
pdiscon_cb->pespconn->proto.tcp = NULL;
}
os_free(pdiscon_cb->pespconn);
pdiscon_cb->pespconn = NULL;
} else {/*Process the client's message block*/
espconn = pdiscon_cb->pespconn;
espconn_printf("client: %d.%d.%d.%d : %d disconnect\n", espconn->proto.tcp->local_ip[0],
espconn->proto.tcp->local_ip[1],espconn->proto.tcp->local_ip[2],
espconn->proto.tcp->local_ip[3],espconn->proto.tcp->local_port);
}
/*process the current TCP block*/
pcb = espconn_find_current_pcb(pdiscon_cb);
if (pcb != NULL){
if (espconn_reuse_disabled(pdiscon_cb)) {
struct tcp_pcb *cpcb = NULL;
struct tcp_pcb *prev = NULL;
u8_t pcb_remove;
espconn_printf("espconn_tcp_disconnect_successful %d, %d\n", pcb->state, pcb->local_port);
cpcb = tcp_tw_pcbs;
while (cpcb != NULL) {
pcb_remove = 0;
if (cpcb->local_port == pcb->local_port) {
++pcb_remove;
}
/* If the PCB should be removed, do it. */
if (pcb_remove) {
struct tcp_pcb *backup_pcb = NULL;
tcp_pcb_purge(cpcb);
/* Remove PCB from tcp_tw_pcbs list. */
if (prev != NULL) {
LWIP_ASSERT("espconn_tcp_delete: middle cpcb != tcp_tw_pcbs",cpcb != tcp_tw_pcbs);
prev->next = cpcb->next;
} else {
/* This PCB was the first. */
LWIP_ASSERT("espconn_tcp_delete: first cpcb == tcp_tw_pcbs",tcp_tw_pcbs == cpcb);
tcp_tw_pcbs = cpcb->next;
}
backup_pcb = cpcb;
cpcb = cpcb->next;
memp_free(MEMP_TCP_PCB, backup_pcb);
} else {
prev = cpcb;
cpcb = cpcb->next;
}
}
} else {
tcp_arg(pcb, NULL);
tcp_err(pcb, NULL);
}
}
}
/*to prevent memory leaks, ensure that each allocated is deleted*/
pdis_buf = pdiscon_cb->pcommon.pbuf;
while (pdis_buf != NULL) {
pdis_back = pdis_buf;
pdis_buf = pdis_back->pnext;
espconn_pbuf_delete(&pdiscon_cb->pcommon.pbuf, pdis_back);
os_free(pdis_back);
pdis_back = NULL;
}
os_bzero(&pktinfo[0], sizeof(struct espconn_packet));
os_memcpy(&pktinfo[0], (void*)&pdiscon_cb->pcommon.packet_info, sizeof(struct espconn_packet));
os_free(pdiscon_cb);
pdiscon_cb = NULL;
if (espconn->proto.tcp && espconn->proto.tcp->disconnect_callback != NULL) {
espconn->proto.tcp->disconnect_callback(espconn);
}
} else {
espconn_printf("espconn_tcp_disconnect err\n");
}
}
/******************************************************************************
* FunctionName : espconn_Task
* Description : espconn processing task
* Parameters : events -- contain the espconn processing data
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_Task(os_event_t *events)
{
espconn_msg *task_msg = NULL;
struct espconn *pespconn = NULL;
task_msg = (espconn_msg *) events->par;
switch (events->sig) {
case SIG_ESPCONN_WRITE: {
pespconn = task_msg->pespconn;
if (pespconn == NULL) {
return;
}
if (pespconn->proto.tcp->write_finish_fn != NULL) {
pespconn->proto.tcp->write_finish_fn(pespconn);
}
}
break;
case SIG_ESPCONN_ERRER:
/*remove the node from the client's active connection list*/
espconn_list_delete(&plink_active, task_msg);
espconn_tcp_reconnect(task_msg);
break;
case SIG_ESPCONN_CLOSE:
/*remove the node from the client's active connection list*/
espconn_list_delete(&plink_active, task_msg);
espconn_tcp_disconnect_successful(task_msg);
break;
default:
break;
}
}
/******************************************************************************
* FunctionName : espconn_tcp_sent
* Description : sent data for client or server
* Parameters : void *arg -- client or server to send
* uint8* psent -- Data to send
* uint16 length -- Length of data to send
* Returns : return espconn error code.
* - ESPCONN_OK. Successful. No error occured.
* - ESPCONN_MEM. Out of memory.
* - ESPCONN_RTE. Could not find route to destination address.
* - More errors could be returned by lower protocol layers.
*******************************************************************************/
err_t ICACHE_FLASH_ATTR
espconn_tcp_sent(void *arg, uint8 *psent, uint16 length)
{
espconn_msg *ptcp_sent = arg;
struct tcp_pcb *pcb = NULL;
err_t err = 0;
u16_t len = 0;
u8_t data_to_send = false;
espconn_printf("espconn_tcp_sent ptcp_sent %p psent %p length %d\n", ptcp_sent, psent, length);
/*Check the parameters*/
if (ptcp_sent == NULL || psent == NULL || length == 0) {
return ESPCONN_ARG;
}
/*Set the packet length depend on the sender buffer space*/
pcb = ptcp_sent->pcommon.pcb;
if (tcp_sndbuf(pcb) < length) {
len = tcp_sndbuf(pcb);
} else {
len = length;
LWIP_ASSERT("length did not fit into uint16!", (len == length));
}
if (len > (2*pcb->mss)) {
len = 2*pcb->mss;
}
/*Write data for sending, but does not send it immediately*/
do {
espconn_printf("espconn_tcp_sent writing %d bytes %p\n", len, pcb);
if (espconn_copy_disabled(ptcp_sent))
err = tcp_write(pcb, psent, len, 1);
else
err = tcp_write(pcb, psent, len, 0);
if (err == ERR_MEM) {
len /= 2;
}
} while (err == ERR_MEM && len > 1);
/*Find out what we can send and send it, offset the buffer point for next send*/
if (err == ERR_OK) {
ptcp_sent->pcommon.ptail->punsent = psent + len;
ptcp_sent->pcommon.ptail->unsent = length - len;
err = tcp_output(pcb);
/*If enable the copy option, change the flag for next write*/
if (espconn_copy_disabled(ptcp_sent)){
if (ptcp_sent->pcommon.ptail->unsent == 0) {
ptcp_sent->pcommon.write_flag = true;
ets_post(espconn_TaskPrio, SIG_ESPCONN_WRITE, (uint32_t)ptcp_sent);
}
}
espconn_printf("espconn_tcp_sent %d\n", err);
}
return err;
}
/******************************************************************************
* FunctionName : espconn_close
* Description : The connection has been successfully closed.
* Parameters : arg -- Additional argument to pass to the callback function
* Returns : none
*******************************************************************************/
void ICACHE_FLASH_ATTR espconn_tcp_disconnect(espconn_msg *pdiscon,u8 type)
{
if (pdiscon != NULL){
/*disconnect with the host by send the FIN frame*/
if (pdiscon->preverse != NULL)
espconn_server_close(pdiscon, pdiscon->pcommon.pcb,type);
else
espconn_client_close(pdiscon, pdiscon->pcommon.pcb,type);
} else{
espconn_printf("espconn_tcp_disconnect err.\n");
}
}
///////////////////////////////client function/////////////////////////////////
/******************************************************************************
* FunctionName : espconn_client_close
* Description : The connection shall be actively closed.
* Parameters : pcb -- Additional argument to pass to the callback function
* pcb -- the pcb to close
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_client_close(void *arg, struct tcp_pcb *pcb, u8 type)
{
err_t err;
espconn_msg *pclose = arg;
pclose->pcommon.pcb = pcb;
/*avoid recalling the disconnect function*/
tcp_recv(pcb, NULL);
if(type == 0)
err = tcp_close(pcb);
else
{tcp_abort(pcb); err = ERR_OK;}
if (err != ERR_OK) {
/* closing failed, try again later */
tcp_recv(pcb, espconn_client_recv);
} else {
/* closing succeeded */
tcp_sent(pcb, NULL);
tcp_err(pcb, NULL);
/*switch the state of espconn for application process*/
pclose->pespconn->state = ESPCONN_CLOSE;
ets_post(espconn_TaskPrio, SIG_ESPCONN_CLOSE, (uint32_t)pclose);
}
}
//***********Code for WIFI_BLOCK from upper**************
sint8 ICACHE_FLASH_ATTR
espconn_recv_hold(struct espconn *pespconn)
{
//1st, according to espconn code, have to find out the escpconn_msg by pespconn;
espconn_msg *pnode = NULL;
bool value = false;
if (pespconn == NULL) {
return ESPCONN_ARG;
}
value = espconn_find_connection(pespconn, &pnode);
if(value != true)
{
os_printf("RecvHold, By pespconn,find conn_msg fail\n");
return ESPCONN_ARG;
}
//2nd, the actual operation
if(pnode->recv_hold_flag == 0)
{
pnode->recv_hold_flag = 1;
pnode->recv_holded_buf_Len = 0;
}
return ESPCONN_OK;
}
sint8 ICACHE_FLASH_ATTR
espconn_recv_unhold(struct espconn *pespconn)
{
//1st, according to espconn code, have to find out the escpconn_msg by pespconn;
espconn_msg *pnode = NULL;
bool value = false;
if (pespconn == NULL) {
return ESPCONN_ARG;
}
value = espconn_find_connection(pespconn, &pnode);
if(value != true)
{
os_printf("RecvHold, By pespconn,find conn_msg fail\n");
return ESPCONN_ARG;
}
//2nd, the actual operation
if(pnode->recv_hold_flag == 1)
{
if(pespconn->type == ESPCONN_TCP) {
tcp_recved(pnode->pcommon.pcb, pnode->recv_holded_buf_Len);
}
pnode->recv_holded_buf_Len = 0;
pnode->recv_hold_flag = 0;
}
return ESPCONN_OK;
}
//***********Code for WIFI_BLOCK from upper**************
/******************************************************************************
* FunctionName : espconn_client_recv
* Description : Data has been received on this pcb.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- The connection pcb which received data
* p -- The received data (or NULL when the connection has been closed!)
* err -- An error code if there has been an error receiving
* Returns : ERR_ABRT: if you have called tcp_abort from within the function!
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_client_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
espconn_msg *precv_cb = arg;
tcp_arg(pcb, arg);
if (p != NULL) {
/*To update and advertise a larger window*/
if(precv_cb->recv_hold_flag == 0)
tcp_recved(pcb, p->tot_len);
else
precv_cb->recv_holded_buf_Len += p->tot_len;
}
if (err == ERR_OK && p != NULL) {
char *pdata = NULL;
u16_t length = 0;
/*Copy the contents of a packet buffer to an application buffer.
*to prevent memory leaks, ensure that each allocated is deleted*/
pdata = (char *)os_zalloc(p ->tot_len + 1);
length = pbuf_copy_partial(p, pdata, p ->tot_len, 0);
pbuf_free(p);
if (length != 0) {
/*switch the state of espconn for application process*/
precv_cb->pespconn ->state = ESPCONN_READ;
precv_cb->pcommon.pcb = pcb;
if (precv_cb->pespconn->recv_callback != NULL) {
precv_cb->pespconn->recv_callback(precv_cb->pespconn, pdata, length);
}
/*switch the state of espconn for next packet copy*/
if (pcb->state == ESTABLISHED)
precv_cb->pespconn ->state = ESPCONN_CONNECT;
}
/*to prevent memory leaks, ensure that each allocated is deleted*/
os_free(pdata);
pdata = NULL;
}
if (err == ERR_OK && p == NULL) {
espconn_client_close(precv_cb, pcb,0);
}
return ERR_OK;
}
/******************************************************************************
* FunctionName : espconn_tcp_write
* Description : write the packet which in the active connection's list.
* Parameters : arg -- the node pointer which reverse the packet
* Returns : ESPCONN_MEM: memory error
* ESPCONN_OK:have enough space for write packet
*******************************************************************************/
err_t ICACHE_FLASH_ATTR espconn_tcp_write(void *arg)
{
espconn_msg *pwrite = arg;
err_t err = ERR_OK;
struct tcp_pcb *pcb = pwrite->pcommon.pcb;
/*for one active connection,limit the sender buffer space*/
if (tcp_nagle_disabled(pcb) && (pcb->snd_queuelen >= TCP_SND_QUEUELEN))
return ESPCONN_MEM;
while (tcp_sndbuf(pcb) != 0){
if (pwrite->pcommon.ptail != NULL) {
/*Find the node whether in the list's tail or not*/
if (pwrite->pcommon.ptail->unsent == 0) {
pwrite->pcommon.ptail = pwrite->pcommon.ptail->pnext;
continue;
}
/*Send the packet for the active connection*/
err = espconn_tcp_sent(pwrite, pwrite->pcommon.ptail->punsent,pwrite->pcommon.ptail->unsent);
if (err != ERR_OK)
break;
} else
break;
}
return err;
}
/******************************************************************************
* FunctionName : espconn_tcp_reconnect
* Description : reconnect with host
* Parameters : arg -- Additional argument to pass to the callback function
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR espconn_tcp_finish(void *arg)
{
espconn_msg *pfinish = arg;
espconn_buf *premove = NULL;
uint16 len = 0;
espconn_tcp_write(pfinish);
while (pfinish->pcommon.pbuf != NULL){
premove = pfinish->pcommon.pbuf;
pfinish->pcommon.pbuf->tot_len += len;
/*application packet has been sent and acknowledged by the remote host,
* to prevent memory leaks, ensure that each allocated is deleted*/
if (premove->tot_len >= premove->len){
espconn_pbuf_delete(&pfinish->pcommon.pbuf,premove);
len = premove->tot_len - premove->len;
pfinish->pcommon.packet_info.sent_length = premove->len;
os_free(premove);
premove = NULL;
pfinish->pespconn->state = ESPCONN_CONNECT;
if (pfinish->pespconn->sent_callback != NULL) {
pfinish->pespconn->sent_callback(pfinish->pespconn);
}
pfinish->pcommon.packet_info.sent_length = len;
} else
break;
}
}
/******************************************************************************
* FunctionName : espconn_client_sent
* Description : Data has been sent and acknowledged by the remote host.
* This means that more data can be sent.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- The connection pcb for which data has been acknowledged
* len -- The amount of bytes acknowledged
* Returns : ERR_OK: try to send some data by calling tcp_output
* ERR_ABRT: if you have called tcp_abort from within the function!
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_client_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
espconn_msg *psent_cb = arg;
psent_cb->pcommon.pcb = pcb;
psent_cb->pcommon.pbuf->tot_len += len;
psent_cb->pcommon.packet_info.sent_length = len;
/*Send more data for one active connection*/
espconn_tcp_finish(psent_cb);
return ERR_OK;
}
/******************************************************************************
* FunctionName : espconn_client_err
* Description : The pcb had an error and is already deallocated.
* The argument might still be valid (if != NULL).
* Parameters : arg -- Additional argument to pass to the callback function
* err -- Error code to indicate why the pcb has been closed
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_client_err(void *arg, err_t err)
{
espconn_msg *perr_cb = arg;
struct tcp_pcb *pcb = NULL;
LWIP_UNUSED_ARG(err);
if (perr_cb != NULL) {
pcb = perr_cb->pcommon.pcb;
perr_cb->pespconn->state = ESPCONN_CLOSE;
espconn_printf("espconn_client_err %d %d %d\n", pcb->state, pcb->nrtx, err);
// /*remove the node from the client's active connection list*/
// espconn_list_delete(&plink_active, perr_cb);
/*Set the error code depend on the error type and control block state*/
if (err == ERR_ABRT) {
switch (pcb->state) {
case SYN_SENT:
if (pcb->nrtx == TCP_SYNMAXRTX) {
perr_cb->pcommon.err = ESPCONN_CONN;
} else {
perr_cb->pcommon.err = err;
}
break;
case ESTABLISHED:
if (pcb->nrtx == TCP_MAXRTX) {
perr_cb->pcommon.err = ESPCONN_TIMEOUT;
} else {
perr_cb->pcommon.err = err;
}
break;
case FIN_WAIT_1:
if (pcb->nrtx == TCP_MAXRTX) {
perr_cb->pcommon.err = ESPCONN_CLSD;
} else {
perr_cb->pcommon.err = err;
}
break;
case FIN_WAIT_2:
perr_cb->pcommon.err = ESPCONN_CLSD;
break;
case CLOSED:
perr_cb->pcommon.err = ESPCONN_CONN;
break;
}
} else {
perr_cb->pcommon.err = err;
}
/*post the singer to the task for processing the connection*/
ets_post(espconn_TaskPrio, SIG_ESPCONN_ERRER, (uint32_t)perr_cb);
}
}
/******************************************************************************
* FunctionName : espconn_client_connect
* Description : A new incoming connection has been connected.
* Parameters : arg -- Additional argument to pass to the callback function
* tpcb -- The connection pcb which is connected
* err -- An unused error code, always ERR_OK currently
* Returns : connection result
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_client_connect(void *arg, struct tcp_pcb *tpcb, err_t err)
{
espconn_msg *pcon = arg;
espconn_printf("espconn_client_connect pcon %p tpcb %p\n", pcon, tpcb);
if (err == ERR_OK){
/*Reserve the remote information for current active connection*/
pcon->pespconn->state = ESPCONN_CONNECT;
pcon->pcommon.err = err;
pcon->pcommon.pcb = tpcb;
pcon->pcommon.local_port = tpcb->local_port;
pcon->pcommon.local_ip = tpcb->local_ip.addr;
pcon->pcommon.remote_port = tpcb->remote_port;
pcon->pcommon.remote_ip[0] = ip4_addr1_16(&tpcb->remote_ip);
pcon->pcommon.remote_ip[1] = ip4_addr2_16(&tpcb->remote_ip);
pcon->pcommon.remote_ip[2] = ip4_addr3_16(&tpcb->remote_ip);
pcon->pcommon.remote_ip[3] = ip4_addr4_16(&tpcb->remote_ip);
pcon->pcommon.write_flag = true;
tcp_arg(tpcb, (void *) pcon);
/*Set the specify function that should be called
* when TCP data has been successfully delivered,
* when active connection receives data*/
tcp_sent(tpcb, espconn_client_sent);
tcp_recv(tpcb, espconn_client_recv);
/*Disable Nagle algorithm default*/
tcp_nagle_disable(tpcb);
/*Default set the total number of espconn_buf on the unsent lists for one*/
espconn_tcp_set_buf_count(pcon->pespconn, 1);
if (pcon->pespconn->proto.tcp->connect_callback != NULL) {
pcon->pespconn->proto.tcp->connect_callback(pcon->pespconn);
}
/*Enable keep alive option*/
if (espconn_keepalive_disabled(pcon))
espconn_keepalive_enable(tpcb);
} else{
os_printf("err in host connected (%s)\n",lwip_strerr(err));
}
return err;
}
/******************************************************************************
* FunctionName : espconn_tcp_client
* Description : Initialize the client: set up a connect PCB and bind it to
* the defined port
* Parameters : espconn -- the espconn used to build client
* Returns : none
*******************************************************************************/
sint8 ICACHE_FLASH_ATTR
espconn_tcp_client(struct espconn *espconn)
{
struct tcp_pcb *pcb = NULL;
struct ip_addr ipaddr;
espconn_msg *pclient = NULL;
/*Creates a new client control message*/
pclient = (espconn_msg *)os_zalloc(sizeof(espconn_msg));
if (pclient == NULL){
return ESPCONN_MEM;
}
/*Set an IP address given for Little-endian.*/
IP4_ADDR(&ipaddr, espconn->proto.tcp->remote_ip[0],
espconn->proto.tcp->remote_ip[1],
espconn->proto.tcp->remote_ip[2],
espconn->proto.tcp->remote_ip[3]);
/*Creates a new TCP protocol control block*/
pcb = tcp_new();
if (pcb == NULL) {
/*to prevent memory leaks, ensure that each allocated is deleted*/
os_free(pclient);
pclient = NULL;
return ESPCONN_MEM;
} else {
/*insert the node to the active connection list*/
espconn_list_creat(&plink_active, pclient);
tcp_arg(pcb, (void *)pclient);
tcp_err(pcb, espconn_client_err);
pclient->preverse = NULL;
pclient->pespconn = espconn;
pclient->pespconn->state = ESPCONN_WAIT;
pclient->pcommon.pcb = pcb;
tcp_bind(pcb, IP_ADDR_ANY, pclient->pespconn->proto.tcp->local_port);
#if 0
pclient->pcommon.err = tcp_bind(pcb, IP_ADDR_ANY, pclient->pespconn->proto.tcp->local_port);
if (pclient->pcommon.err != ERR_OK){
/*remove the node from the client's active connection list*/
espconn_list_delete(&plink_active, pclient);
memp_free(MEMP_TCP_PCB, pcb);
os_free(pclient);
pclient = NULL;
return ERR_USE;
}
#endif
/*Establish the connection*/
pclient->pcommon.err = tcp_connect(pcb, &ipaddr,
pclient->pespconn->proto.tcp->remote_port, espconn_client_connect);
if (pclient->pcommon.err == ERR_RTE){
/*remove the node from the client's active connection list*/
espconn_list_delete(&plink_active, pclient);
espconn_kill_pcb(pcb->local_port);
os_free(pclient);
pclient = NULL;
return ESPCONN_RTE;
}
return pclient->pcommon.err;
}
}
///////////////////////////////server function/////////////////////////////////
/******************************************************************************
* FunctionName : espconn_server_close
* Description : The connection shall be actively closed.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- the pcb to close
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
espconn_server_close(void *arg, struct tcp_pcb *pcb,u8 type)
{
err_t err;
espconn_msg *psclose = arg;
psclose->pcommon.pcb = pcb;
/*avoid recalling the disconnect function*/
tcp_recv(pcb, NULL);
if(type ==0)
err = tcp_close(pcb);
else
{tcp_abort(pcb); err = ERR_OK;}
if (err != ERR_OK) {
/* closing failed, try again later */
tcp_recv(pcb, espconn_server_recv);
} else {
/* closing succeeded */
tcp_poll(pcb, NULL, 0);
tcp_sent(pcb, NULL);
tcp_err(pcb, NULL);
/*switch the state of espconn for application process*/
psclose->pespconn->state = ESPCONN_CLOSE;
ets_post(espconn_TaskPrio, SIG_ESPCONN_CLOSE, (uint32_t)psclose);
}
}
/******************************************************************************
* FunctionName : espconn_server_recv
* Description : Data has been received on this pcb.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- The connection pcb which received data
* p -- The received data (or NULL when the connection has been closed!)
* err -- An error code if there has been an error receiving
* Returns : ERR_ABRT: if you have called tcp_abort from within the function!
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_server_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
espconn_msg *precv_cb = arg;
tcp_arg(pcb, arg);
espconn_printf("server has application data received: %d\n", system_get_free_heap_size());
if (p != NULL) {
/*To update and advertise a larger window*/
if(precv_cb->recv_hold_flag == 0)
tcp_recved(pcb, p->tot_len);
else
precv_cb->recv_holded_buf_Len += p->tot_len;
}
if (err == ERR_OK && p != NULL) {
u8_t *data_ptr = NULL;
u32_t data_cntr = 0;
/*clear the count for connection timeout*/
precv_cb->pcommon.recv_check = 0;
/*Copy the contents of a packet buffer to an application buffer.
*to prevent memory leaks, ensure that each allocated is deleted*/
data_ptr = (u8_t *)os_zalloc(p ->tot_len + 1);
data_cntr = pbuf_copy_partial(p, data_ptr, p ->tot_len, 0);
pbuf_free(p);
if (data_cntr != 0) {
/*switch the state of espconn for application process*/
precv_cb->pespconn ->state = ESPCONN_READ;
precv_cb->pcommon.pcb = pcb;
if (precv_cb->pespconn->recv_callback != NULL) {
precv_cb->pespconn->recv_callback(precv_cb->pespconn, data_ptr, data_cntr);
}
/*switch the state of espconn for next packet copy*/
if (pcb->state == ESTABLISHED)
precv_cb->pespconn ->state = ESPCONN_CONNECT;
}
/*to prevent memory leaks, ensure that each allocated is deleted*/
os_free(data_ptr);
data_ptr = NULL;
espconn_printf("server's application data has been processed: %d\n", system_get_free_heap_size());
} else {
if (p != NULL) {
pbuf_free(p);
}
espconn_server_close(precv_cb, pcb,0);
}
return ERR_OK;
}
/******************************************************************************
* FunctionName : espconn_server_sent
* Description : Data has been sent and acknowledged by the remote host.
* This means that more data can be sent.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- The connection pcb for which data has been acknowledged
* len -- The amount of bytes acknowledged
* Returns : ERR_OK: try to send some data by calling tcp_output
* ERR_ABRT: if you have called tcp_abort from within the function!
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_server_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
espconn_msg *psent_cb = arg;
psent_cb->pcommon.pcb = pcb;
psent_cb->pcommon.recv_check = 0;
psent_cb->pcommon.pbuf->tot_len += len;
psent_cb->pcommon.packet_info.sent_length = len;
/*Send more data for one active connection*/
espconn_tcp_finish(psent_cb);
return ERR_OK;
}
/******************************************************************************
* FunctionName : espconn_server_poll
* Description : The poll function is called every 3nd second.
* If there has been no data sent (which resets the retries) in 3 seconds, close.
* If the last portion of a file has not been sent in 3 seconds, close.
*
* This could be increased, but we don't want to waste resources for bad connections.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- The connection pcb for which data has been acknowledged
* Returns : ERR_OK: try to send some data by calling tcp_output
* ERR_ABRT: if you have called tcp_abort from within the function!
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_server_poll(void *arg, struct tcp_pcb *pcb)
{
espconn_msg *pspoll_cb = arg;
/*exception calling abandon the connection for send a RST frame*/
if (arg == NULL) {
tcp_abandon(pcb, 0);
tcp_poll(pcb, NULL, 0);
return ERR_OK;
}
espconn_printf("espconn_server_poll %d %d\n", pspoll_cb->pcommon.recv_check, pcb->state);
pspoll_cb->pcommon.pcb = pcb;
if (pcb->state == ESTABLISHED) {
pspoll_cb->pcommon.recv_check++;
if (pspoll_cb->pcommon.timeout != 0){/*no data sent in one active connection's set timeout, close.*/
if (pspoll_cb->pcommon.recv_check >= pspoll_cb->pcommon.timeout) {
pspoll_cb->pcommon.recv_check = 0;
espconn_server_close(pspoll_cb, pcb,0);
}
} else {
espconn_msg *ptime_msg = pserver_list;
while (ptime_msg != NULL) {
if (ptime_msg->pespconn == pspoll_cb->preverse){
if (ptime_msg->pcommon.timeout != 0){/*no data sent in server's set timeout, close.*/
if (pspoll_cb->pcommon.recv_check >= ptime_msg->pcommon.timeout){
pspoll_cb->pcommon.recv_check = 0;
espconn_server_close(pspoll_cb, pcb,0);
}
} else {/*don't close for ever*/
pspoll_cb->pcommon.recv_check = 0;
}
break;
}
ptime_msg = ptime_msg->pnext;
}
}
} else {
espconn_server_close(pspoll_cb, pcb,0);
}
return ERR_OK;
}
/******************************************************************************
* FunctionName : esponn_server_err
* Description : The pcb had an error and is already deallocated.
* The argument might still be valid (if != NULL).
* Parameters : arg -- Additional argument to pass to the callback function
* err -- Error code to indicate why the pcb has been closed
* Returns : none
*******************************************************************************/
static void ICACHE_FLASH_ATTR
esponn_server_err(void *arg, err_t err)
{
espconn_msg *pserr_cb = arg;
struct tcp_pcb *pcb = NULL;
if (pserr_cb != NULL) {
pcb = pserr_cb->pcommon.pcb;
pserr_cb->pespconn->state = ESPCONN_CLOSE;
// /*remove the node from the server's active connection list*/
// espconn_list_delete(&plink_active, pserr_cb);
/*Set the error code depend on the error type and control block state*/
if (err == ERR_ABRT) {
switch (pcb->state) {
case SYN_RCVD:
if (pcb->nrtx == TCP_SYNMAXRTX) {
pserr_cb->pcommon.err = ESPCONN_CONN;
} else {
pserr_cb->pcommon.err = err;
}
break;
case ESTABLISHED:
if (pcb->nrtx == TCP_MAXRTX) {
pserr_cb->pcommon.err = ESPCONN_TIMEOUT;
} else {
pserr_cb->pcommon.err = err;
}
break;
case CLOSE_WAIT:
if (pcb->nrtx == TCP_MAXRTX) {
pserr_cb->pcommon.err = ESPCONN_CLSD;
} else {
pserr_cb->pcommon.err = err;
}
break;
case LAST_ACK:
pserr_cb->pcommon.err = ESPCONN_CLSD;
break;
case CLOSED:
pserr_cb->pcommon.err = ESPCONN_CONN;
break;
default :
break;
}
} else {
pserr_cb->pcommon.err = err;
}
/*post the singer to the task for processing the connection*/
ets_post(espconn_TaskPrio, SIG_ESPCONN_ERRER, (uint32_t)pserr_cb);
}
}
/******************************************************************************
* FunctionName : espconn_tcp_accept
* Description : A new incoming connection has been accepted.
* Parameters : arg -- Additional argument to pass to the callback function
* pcb -- The connection pcb which is accepted
* err -- An unused error code, always ERR_OK currently
* Returns : acception result
*******************************************************************************/
static err_t ICACHE_FLASH_ATTR
espconn_tcp_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{
struct espconn *espconn = arg;
espconn_msg *paccept = NULL;
remot_info *pinfo = NULL;
LWIP_UNUSED_ARG(err);
if (!espconn || !espconn->proto.tcp) {
return ERR_ARG;
}
tcp_arg(pcb, paccept);
tcp_err(pcb, esponn_server_err);
/*Ensure the active connection is less than the count of active connections on the server*/
espconn_get_connection_info(espconn, &pinfo , 0);
espconn_printf("espconn_tcp_accept link_cnt: %d\n", espconn->link_cnt);
if (espconn->link_cnt == espconn_tcp_get_max_con_allow(espconn))
return ERR_ISCONN;
/*Creates a new active connect control message*/
paccept = (espconn_msg *)os_zalloc(sizeof(espconn_msg));
tcp_arg(pcb, paccept);
if (paccept == NULL)
return ERR_MEM;
/*Insert the node to the active connection list*/
espconn_list_creat(&plink_active, paccept);
paccept->preverse = espconn;
paccept->pespconn = (struct espconn *)os_zalloc(sizeof(struct espconn));
if (paccept->pespconn == NULL)
return ERR_MEM;
paccept->pespconn->proto.tcp = (esp_tcp *)os_zalloc(sizeof(esp_tcp));
if (paccept->pespconn->proto.tcp == NULL)
return ERR_MEM;
/*Reserve the remote information for current active connection*/
paccept->pcommon.pcb = pcb;
paccept->pcommon.remote_port = pcb->remote_port;
paccept->pcommon.remote_ip[0] = ip4_addr1_16(&pcb->remote_ip);
paccept->pcommon.remote_ip[1] = ip4_addr2_16(&pcb->remote_ip);
paccept->pcommon.remote_ip[2] = ip4_addr3_16(&pcb->remote_ip);
paccept->pcommon.remote_ip[3] = ip4_addr4_16(&pcb->remote_ip);
paccept->pcommon.write_flag = true;
os_memcpy(espconn->proto.tcp->remote_ip, paccept->pcommon.remote_ip, 4);
espconn->proto.tcp->remote_port = pcb->remote_port;
espconn->state = ESPCONN_CONNECT;
espconn_copy_partial(paccept->pespconn, espconn);
/*Set the specify function that should be called
* when TCP data has been successfully delivered,
* when active connection receives data,
* or periodically from active connection*/
tcp_sent(pcb, espconn_server_sent);
tcp_recv(pcb, espconn_server_recv);
tcp_poll(pcb, espconn_server_poll, 8); /* every 1 seconds */
/*Disable Nagle algorithm default*/
tcp_nagle_disable(pcb);
/*Default set the total number of espconn_buf on the unsent lists for one*/
espconn_tcp_set_buf_count(paccept->pespconn, 1);
if (paccept->pespconn->proto.tcp->connect_callback != NULL) {
paccept->pespconn->proto.tcp->connect_callback(paccept->pespconn);
}
/*Enable keep alive option*/
if (espconn_keepalive_disabled(paccept))
espconn_keepalive_enable(pcb);
return ERR_OK;
}
/******************************************************************************
* FunctionName : espconn_tcp_server
* Description : Initialize the server: set up a listening PCB and bind it to
* the defined port
* Parameters : espconn -- the espconn used to build server
* Returns : none
*******************************************************************************/
sint8 ICACHE_FLASH_ATTR
espconn_tcp_server(struct espconn *espconn)
{
struct tcp_pcb *pcb = NULL;
espconn_msg *pserver = NULL;
/*Creates a new server control message*/
pserver = (espconn_msg *)os_zalloc(sizeof(espconn_msg));
if (pserver == NULL){
return ESPCONN_MEM;
}
/*Creates a new TCP protocol control block*/
pcb = tcp_new();
if (pcb == NULL) {
/*to prevent memory leaks, ensure that each allocated is deleted*/
os_free(pserver);
pserver = NULL;
return ESPCONN_MEM;
} else {
struct tcp_pcb *lpcb = NULL;
/*Binds the connection to a local port number and any IP address*/
tcp_bind(pcb, IP_ADDR_ANY, espconn->proto.tcp->local_port);
lpcb = pcb;
/*malloc and set the state of the connection to be LISTEN*/
pcb = tcp_listen(pcb);
if (pcb != NULL) {
/*insert the node to the active connection list*/
espconn_list_creat(&pserver_list, pserver);
pserver->preverse = pcb;
pserver->pespconn = espconn;
pserver->count_opt = MEMP_NUM_TCP_PCB;
pserver->pcommon.timeout = 0x0a;
espconn ->state = ESPCONN_LISTEN;
/*set the specify argument that should be passed callback function*/
tcp_arg(pcb, (void *)espconn);
/*accept callback function to call for this control block*/
tcp_accept(pcb, espconn_tcp_accept);
return ESPCONN_OK;
} else {
/*to prevent memory leaks, ensure that each allocated is deleted*/
memp_free(MEMP_TCP_PCB,lpcb);
os_free(pserver);
pserver = NULL;
return ESPCONN_MEM;
}
}
}
/******************************************************************************
* FunctionName : espconn_tcp_delete
* Description : delete the server: delete a listening PCB and free it
* Parameters : pdeletecon -- the espconn used to delete a server
* Returns : none
*******************************************************************************/
sint8 ICACHE_FLASH_ATTR espconn_tcp_delete(struct espconn *pdeletecon)
{
err_t err;
remot_info *pinfo = NULL;
espconn_msg *pdelete_msg = NULL;
struct tcp_pcb *pcb = NULL;
if (pdeletecon == NULL)
return ESPCONN_ARG;
espconn_get_connection_info(pdeletecon, &pinfo , 0);
/*make sure all the active connection have been disconnect*/
if (pdeletecon->link_cnt != 0)
return ESPCONN_INPROGRESS;
else {
espconn_printf("espconn_tcp_delete %p\n",pdeletecon);
pdelete_msg = pserver_list;
while (pdelete_msg != NULL){
if (pdelete_msg->pespconn == pdeletecon){
/*remove the node from the client's active connection list*/
espconn_list_delete(&pserver_list, pdelete_msg);
pcb = pdelete_msg->preverse;
os_printf("espconn_tcp_delete %d, %d\n",pcb->state, pcb->local_port);
espconn_kill_pcb(pcb->local_port);
err = tcp_close(pcb);
os_free(pdelete_msg);
pdelete_msg = NULL;
break;
}
pdelete_msg = pdelete_msg->pnext;
}
if (err == ERR_OK)
return err;
else
return ESPCONN_ARG;
}
}
/******************************************************************************
* FunctionName : espconn_init
* Description : used to init the function that should be used when
* Parameters : none
* Returns : none
*******************************************************************************/
void ICACHE_FLASH_ATTR espconn_init(void)
{
ets_task(espconn_Task, espconn_TaskPrio, espconn_TaskQueue, espconn_TaskQueueLen);
}
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