Remove intrusive list from AsyncClient

Author: willmmiles

src/AsyncTCP.cpp

@@ -717,7 +717,7 @@ static tcp_pcb *_tcp_listen_with_backlog(tcp_pcb *pcb, uint8_t backlog) {
 AsyncClient::AsyncClient(tcp_pcb *pcb)
   : _connect_cb(0), _connect_cb_arg(0), _discard_cb(0), _discard_cb_arg(0), _sent_cb(0), _sent_cb_arg(0), _error_cb(0), _error_cb_arg(0), _recv_cb(0),
     _recv_cb_arg(0), _pb_cb(0), _pb_cb_arg(0), _timeout_cb(0), _timeout_cb_arg(0), _poll_cb(0), _poll_cb_arg(0), _ack_pcb(true), _tx_last_packet(0),
-    _rx_timeout(0), _rx_last_ack(0), _ack_timeout(CONFIG_ASYNC_TCP_MAX_ACK_TIME), _connect_port(0), prev(NULL), next(NULL) {
+    _rx_timeout(0), _rx_last_ack(0), _ack_timeout(CONFIG_ASYNC_TCP_MAX_ACK_TIME), _connect_port(0) {
   _pcb = pcb;
   _closed_slot = INVALID_CLOSED_SLOT;
   if (_pcb) {
@@ -766,21 +766,6 @@ bool AsyncClient::operator==(const AsyncClient &other) const {
   return _pcb == other._pcb;
 }
 
-AsyncClient &AsyncClient::operator+=(const AsyncClient &other) {
-  if (next == NULL) {
-    next = (AsyncClient *)(&other);
-    next->prev = this;
-  } else {
-    AsyncClient *c = next;
-    while (c->next != NULL) {
-      c = c->next;
-    }
-    c->next = (AsyncClient *)(&other);
-    c->next->prev = c;
-  }
-  return *this;
-}
-
 /*
  * Callback Setters
  * */

src/AsyncTCP.h

@@ -76,7 +76,6 @@ class AsyncClient {
   ~AsyncClient();
 
   AsyncClient &operator=(const AsyncClient &other);
-  AsyncClient &operator+=(const AsyncClient &other);
 
   bool operator==(const AsyncClient &other) const;
 
@@ -290,10 +289,6 @@ class AsyncClient {
   int8_t _fin(tcp_pcb *pcb, int8_t err);
   int8_t _lwip_fin(tcp_pcb *pcb, int8_t err);
   void _dns_found(struct ip_addr *ipaddr);
-
-public:
-  AsyncClient *prev;
-  AsyncClient *next;
 };
 
 class AsyncServer {