examples/telnet_server: add support for LWIP

examples/telnet_server/Makefile

@@ -10,13 +10,23 @@ RIOTBASE ?= $(CURDIR)/../..
 # Include packages that pull up and auto-init the link layer.
 # NOTE: 6LoWPAN will be included if IEEE802.15.4 devices are present
 USEMODULE += netdev_default
-USEMODULE += auto_init_gnrc_netif
-# Activate ICMPv6 error messages
-USEMODULE += gnrc_icmpv6_error
-# Specify the mandatory networking modules for IPv6
-USEMODULE += gnrc_ipv6_default
-# Additional networking modules that can be dropped if not needed
-USEMODULE += gnrc_icmpv6_echo
+
+# use GNRC by default
+LWIP ?= 0
+
+ifeq (0,$(LWIP))
+  USEMODULE += auto_init_gnrc_netif
+  # Activate ICMPv6 error messages
+  USEMODULE += gnrc_icmpv6_error
+  # Specify the mandatory networking modules for IPv6
+  USEMODULE += gnrc_ipv6_default
+  # Additional networking modules that can be dropped if not needed
+  USEMODULE += gnrc_icmpv6_echo
+else
+  USEMODULE += lwip_ipv6
+  USEMODULE += lwip_netdev
+endif
+
 USEMODULE += netutils
 # Add also the shell, some shell commands
 USEMODULE += shell

examples/telnet_server/main.c

@@ -21,15 +21,16 @@
 #include <stdio.h>
 
 #include "net/ipv6/addr.h"
-#include "net/gnrc.h"
-#include "net/gnrc/netif.h"
 #include "net/telnet.h"
 #include "shell.h"
 #include "msg.h"
 
 #define MAIN_QUEUE_SIZE     (8)
 static msg_t _main_msg_queue[MAIN_QUEUE_SIZE];
 
+#if IS_USED(MODULE_GNRC)
+#include "net/gnrc.h"
+#include "net/gnrc/netif.h"
 static void _print_addr(void)
 {
     gnrc_netif_t *netif = NULL;
@@ -49,6 +50,12 @@ static void _print_addr(void)
         }
     }
 }
+#else
+static void _print_addr(void)
+{
+    /* TODO */
+}
+#endif
 
 static void _print_motd(void)
 {