diff --git a/STM32lwipopts.h b/STM32lwipopts.h
new file mode 100644
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--- /dev/null
+++ b/STM32lwipopts.h
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+/**
+ ******************************************************************************
+ * @file STM32lwipopts_default.h
+ * @author MCD Application Team
+ * @brief lwIP Options Configuration.
+ ******************************************************************************
+ * @attention
+ *
+ *
© Copyright (c) 2017 STMicroelectronics International N.V.
+ * All rights reserved.
+ *
+ * This software component is licensed by ST under Ultimate Liberty license
+ * SLA0044, the "License"; You may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at:
+ * www.st.com/SLA0044
+ *
+ ******************************************************************************
+ */
+#ifndef __STM32LWIPOPTS_H__
+#define __STM32LWIPOPTS_H__
+
+// we can not include that here so we
+// need to duplicate that.define
+// #include "defines.h"
+#define MAX_NUM_TCP_CLIENTS 20
+
+// increase ARP cache
+#define MEMP_NUM_ARP_QUEUE MAX_NUM_TCP_CLIENTS+3 // one for each client (all on different HW) and a few extra
+
+// Example for debug
+//#define LWIP_DEBUG 1
+//#define TCP_DEBUG LWIP_DBG_ON
+
+/**
+ * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
+ * use lwIP facilities.
+ */
+#define NO_SYS 1
+
+/**
+ * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
+ * critical regions during buffer allocation, deallocation and memory
+ * allocation and deallocation.
+ */
+#define SYS_LIGHTWEIGHT_PROT 0
+
+#define LWIP_NOASSERT
+
+/* ---------- Memory options ---------- */
+/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
+ lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
+ byte alignment -> define MEM_ALIGNMENT to 2. */
+#define MEM_ALIGNMENT 4
+
+/* MEM_SIZE: the size of the heap memory. If the application will send
+a lot of data that needs to be copied, this should be set high. */
+#define MEM_SIZE (10*1024)
+
+// Could be better or worse, needs more tests
+//#define MEM_LIBC_MALLOC 1
+//#define MEMP_MEM_MALLOC 1
+
+/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
+ sends a lot of data out of ROM (or other static memory), this
+ should be set high. */
+#define MEMP_NUM_PBUF 10
+/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
+ per active UDP "connection". */
+#define MEMP_NUM_UDP_PCB 6
+/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
+ connections. */
+#define MEMP_NUM_TCP_PCB MAX_NUM_TCP_CLIENTS+1 // one extra so we can reject number N+1 from our code
+/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
+ connections. */
+#define MEMP_NUM_TCP_PCB_LISTEN 6
+/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
+ segments. */
+#define MEMP_NUM_TCP_SEG MAX_NUM_TCP_CLIENTS
+/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+ timeouts. */
+#define MEMP_NUM_SYS_TIMEOUT MAX_NUM_TCP_CLIENTS+2
+
+
+/* ---------- Pbuf options ---------- */
+/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
+#define PBUF_POOL_SIZE MAX_NUM_TCP_CLIENTS
+
+/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
+#define PBUF_POOL_BUFSIZE 1524
+
+
+/* ---------- TCP options ---------- */
+#define LWIP_TCP 1
+#define TCP_TTL 255
+#define LWIP_SO_RCVTIMEO 1
+#define LWIP_SO_RCVRCVTIMEO_NONSTANDARD 1 /* Pass an integer number of ms instead of a timeval struct. */
+#define LWIP_SO_SNDTIMEO 1
+#define LWIP_SO_SNDRCVTIMEO_NONSTANDARD 1 /* Pass an integer number of ms instead of a timeval struct. */
+
+/* Controls if TCP should queue segments that arrive out of
+ order. Define to 0 if your device is low on memory and you are not scared by TCP congestion and latencies. */
+#define TCP_QUEUE_OOSEQ 0
+
+/* TCP Maximum segment size. */
+#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */
+
+/* TCP sender buffer space (bytes). */
+#define TCP_SND_BUF (4*TCP_MSS)
+
+/* TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
+ as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */
+
+#define TCP_SND_QUEUELEN (2* TCP_SND_BUF/TCP_MSS)
+
+/* TCP receive window. */
+#define TCP_WND (3*TCP_MSS)
+
+#define LWIP_TCP_KEEPALIVE 1 /* Keep the TCP link active. Important for MQTT/TLS */
+#define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 1 /* Prevent the same port to be used after reset.
+ Otherwise, the remote host may be confused if the port was not explicitly closed before the reset. */
+
+
+/* ---------- ICMP options ---------- */
+#define LWIP_ICMP 1
+#define LWIP_RAW 1 /* PING changed to 1 */
+#define DEFAULT_RAW_RECVMBOX_SIZE 3 /* for ICMP PING */
+
+
+/* ---------- DHCP options ---------- */
+/* Define LWIP_DHCP to 1 if you want DHCP configuration of
+ interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
+ turning this on does currently not work. */
+#define LWIP_DHCP 1
+
+
+/* ---------- UDP options ---------- */
+#define LWIP_UDP 1
+#define UDP_TTL 255
+
+
+/* ---------- Statistics options ---------- */
+#define LWIP_STATS 0
+#define LWIP_PROVIDE_ERRNO
+
+/* ---------- link callback options ---------- */
+/* LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
+ * whenever the link changes (i.e., link down)
+ */
+// need for building net_ip.c
+#define LWIP_NETIF_HOSTNAME 1
+#define LWIP_NETIF_STATUS_CALLBACK 1
+#define LWIP_NETIF_LINK_CALLBACK 1
+#define LWIP_DHCP_CHECK_LINK_UP 1
+
+/*
+ --------------------------------------
+ ---------- Checksum options ----------
+ --------------------------------------
+*/
+
+/*
+The STM32F4x7 allows computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:
+ - To use this feature let the following define uncommented.
+ - To disable it and process by CPU comment the the checksum.
+*/
+#define CHECKSUM_BY_HARDWARE
+
+
+#ifdef CHECKSUM_BY_HARDWARE
+ /* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/
+ #define CHECKSUM_GEN_IP 0
+ /* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/
+ #define CHECKSUM_GEN_UDP 0
+ /* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/
+ #define CHECKSUM_GEN_TCP 0
+ /* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/
+ #define CHECKSUM_CHECK_IP 0
+ /* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/
+ #define CHECKSUM_CHECK_UDP 0
+ /* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/
+ #define CHECKSUM_CHECK_TCP 0
+ /* CHECKSUM_CHECK_ICMP==0: Check checksums by hardware for incoming ICMP packets.*/
+ #define CHECKSUM_GEN_ICMP 0
+#else
+ /* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/
+ #define CHECKSUM_GEN_IP 1
+ /* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/
+ #define CHECKSUM_GEN_UDP 1
+ /* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/
+ #define CHECKSUM_GEN_TCP 1
+ /* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/
+ #define CHECKSUM_CHECK_IP 1
+ /* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/
+ #define CHECKSUM_CHECK_UDP 1
+ /* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/
+ #define CHECKSUM_CHECK_TCP 1
+ /* CHECKSUM_CHECK_ICMP==1: Check checksums by hardware for incoming ICMP packets.*/
+ #define CHECKSUM_GEN_ICMP 1
+#endif
+
+
+/*
+ ----------------------------------------------
+ ---------- Sequential layer options ----------
+ ----------------------------------------------
+*/
+/**
+ * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
+ */
+#define LWIP_NETCONN 0
+
+/*
+ ------------------------------------
+ ---------- Socket options ----------
+ ------------------------------------
+*/
+/**
+ * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
+ */
+#define LWIP_SOCKET 0
+#define LWIP_DNS 1
+
+/*
+ ------------------------------------
+ ---------- httpd options ----------
+ ------------------------------------
+*/
+
+/** Set this to 1 to support CGI */
+#define LWIP_HTTPD_CGI 1
+
+/** Set this to 1 to support SSI (Server-Side-Includes) */
+#define LWIP_HTTPD_SSI 1
+
+/** Set this to 1 to include "fsdata_custom.c" instead of "fsdata.c" for the
+ * file system (to prevent changing the file included in CVS) */
+#define HTTPD_USE_CUSTOM_FSDATA 1
+
+/*
+ ------------------------------------
+ ---------- Custom options ----------
+ ------------------------------------
+*/
+
+/** Enables the Ethernet peripheral in RMII mode. If not defined, MII mode will
+ be enabled. Pin mapping must be configured for the selected mode
+ (see PinMap_Ethernet in PeripheralPins.c). */
+#define ETHERNET_RMII_MODE_CONFIGURATION 1
+
+/** Uncomment this line to use the ethernet input in interrupt mode.
+ * NOTE: LwIP stack documentation recommends to use the polling mode without
+ * an operating system. */
+//#define ETH_INPUT_USE_IT 1
+
+#define LWIP_MDNS_RESPONDER 1
+#define LWIP_IGMP 1
+#warning testing this
+
+#endif /* __STM32LWIPOPTS_H__ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/