TCP/UDP documentation: Add reference to PCB mempool #defines

(cherry picked from commit 8bf2e21b4d9f3d3119542deb161e3d4f7b3c280a)

src/core/tcp.c

@@ -647,6 +647,7 @@ tcp_abort(struct tcp_pcb *pcb)
  * bound to all local IP addresses.
  * If another connection is bound to the same port, the function will
  * return ERR_USE, otherwise ERR_OK is returned.
+ * @see MEMP_NUM_TCP_PCB_LISTEN and MEMP_NUM_TCP_PCB
  *
  * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
  *        already bound!)
@@ -1933,6 +1934,7 @@ tcp_alloc(u8_t prio)
  * any of the TCP PCB lists.
  * The pcb is not put on any list until binding using tcp_bind().
  * If memory is not available for creating the new pcb, NULL is returned.
+ * @see MEMP_NUM_TCP_PCB_LISTEN and MEMP_NUM_TCP_PCB
  *
  * @internal: Maybe there should be a idle TCP PCB list where these
  * PCBs are put on. Port reservation using tcp_bind() is implemented but
@@ -1952,6 +1954,7 @@ tcp_new(void)
  * Creates a new TCP protocol control block but doesn't
  * place it on any of the TCP PCB lists.
  * The pcb is not put on any list until binding using tcp_bind().
+ * @see MEMP_NUM_TCP_PCB_LISTEN and MEMP_NUM_TCP_PCB
  *
  * @param type IP address type, see @ref lwip_ip_addr_type definitions.
  * If you want to listen to IPv4 and IPv6 (dual-stack) connections,
@@ -2067,6 +2070,7 @@ tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
  * @ingroup tcp_raw
  * Used for specifying the function that should be called when a
  * LISTENing connection has been connected to another host.
+ * @see MEMP_NUM_TCP_PCB_LISTEN and MEMP_NUM_TCP_PCB
  *
  * @param pcb tcp_pcb to set the accept callback
  * @param accept callback function to call for this pcb when LISTENing

src/core/udp.c

@@ -1208,6 +1208,7 @@ udp_remove(struct udp_pcb *pcb)
  * Creates a new UDP pcb which can be used for UDP communication. The
  * pcb is not active until it has either been bound to a local address
  * or connected to a remote address.
+ * @see MEMP_NUM_UDP_PCB
  *
  * @return The UDP PCB which was created. NULL if the PCB data structure
  * could not be allocated.
@@ -1242,7 +1243,8 @@ udp_new(void)
  * Create a UDP PCB for specific IP type.
  * The pcb is not active until it has either been bound to a local address
  * or connected to a remote address.
- * 
+ * @see MEMP_NUM_UDP_PCB
+ *
  * @param type IP address type, see @ref lwip_ip_addr_type definitions.
  * If you want to listen to IPv4 and IPv6 (dual-stack) packets,
  * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE.