From 5bc1d919279a4c93cca3f0e97dac523a910efa1a Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Date: Mon, 13 May 2024 14:58:35 +0200
Subject: [PATCH] [DROP ME] examples/gnrc_networking: add fragmentation test

---
 examples/gnrc_networking/Makefile | 14 +++++---
 examples/gnrc_networking/main.c   | 56 +++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 4 deletions(-)

diff --git a/examples/gnrc_networking/Makefile b/examples/gnrc_networking/Makefile
index 555b89eee55e2..736f4b5274115 100644
--- a/examples/gnrc_networking/Makefile
+++ b/examples/gnrc_networking/Makefile
@@ -14,10 +14,10 @@ USEMODULE += auto_init_gnrc_netif
 # Activate ICMPv6 error messages
 USEMODULE += gnrc_icmpv6_error
 # Specify the mandatory networking module for a IPv6 routing node
-USEMODULE += gnrc_ipv6_router_default
+USEMODULE += gnrc_ipv6_default
 # Add a routing protocol
-USEMODULE += gnrc_rpl
-USEMODULE += auto_init_gnrc_rpl
+#USEMODULE += gnrc_rpl
+#USEMODULE += auto_init_gnrc_rpl
 # Additional networking modules that can be dropped if not needed
 USEMODULE += gnrc_icmpv6_echo
 USEMODULE += shell_cmd_gnrc_udp
@@ -27,7 +27,13 @@ USEMODULE += shell_cmds_default
 USEMODULE += ps
 USEMODULE += netstats_l2
 USEMODULE += netstats_ipv6
-USEMODULE += netstats_rpl
+
+USEMODULE += sock_udp
+USEMODULE += gnrc_ipv6_ext_frag
+USEMODULE += gnrc_netif_single
+USEMODULE += gnrc_netif_pktq
+CFLAGS += -DCONFIG_GNRC_PKTBUF_SIZE=65536
+
 
 # Optionally include DNS support. This includes resolution of names at an
 # upstream DNS server and the handling of RDNSS options in Router Advertisements
diff --git a/examples/gnrc_networking/main.c b/examples/gnrc_networking/main.c
index 734ae420671ea..b3b2a71830e6b 100644
--- a/examples/gnrc_networking/main.c
+++ b/examples/gnrc_networking/main.c
@@ -26,6 +26,62 @@
 #define MAIN_QUEUE_SIZE     (8)
 static msg_t _main_msg_queue[MAIN_QUEUE_SIZE];
 
+#include "net/sock/udp.h"
+
+static void _fill_buffer(void *buffer, size_t len)
+{
+    void *end = (char *)buffer + len;
+    uint16_t *b16 = buffer;
+    uint16_t count = 0;
+    while ((void *)b16 < end) {
+        *b16++ = count++;
+    }
+}
+
+static int _udp_cmd(int argc, char **argv)
+{
+    if (argc < 2) {
+        goto usage;
+    }
+
+    int len = atoi(argv[1]);
+    if (!len) {
+        goto usage;
+    }
+
+    if (len & 1) {
+        ++len;
+    }
+
+    static uint8_t _buf[65536];
+    if (len > (int)sizeof(_buf)) {
+        puts("too big");
+        return -ENOBUFS;
+    }
+
+    const sock_udp_ep_t remote = {
+         .family = AF_INET6,
+         .addr = IPV6_ADDR_ALL_NODES_LINK_LOCAL,
+         .port = 1234,
+    };
+
+    _fill_buffer(_buf, len);
+    int res = sock_udp_send(NULL, _buf, len, &remote);
+    if (res > 0) {
+        printf("%d bytes sent\n", res);
+    } else {
+        printf("error: %d\n", -res);
+    }
+
+    return 0;
+
+usage:
+    printf("usage: %s <bytes>\n", argv[0]);
+    return 1;
+}
+
+SHELL_COMMAND(udp2, "send large UDP packets", _udp_cmd);
+
 int main(void)
 {
     /* we need a message queue for the thread running the shell in order to