From fbed749cd316f1c9fe8dbe8a564b41f93cf0ac1f Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Fri, 21 Mar 2025 22:15:46 +0100
Subject: fw: Use SLAAC for network configuration

---
 fw/prj.conf     |  8 ++------
 fw/src/syslog.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 54 insertions(+), 10 deletions(-)

diff --git a/fw/prj.conf b/fw/prj.conf
index 9ac1b51..a046a89 100644
--- a/fw/prj.conf
+++ b/fw/prj.conf
@@ -8,14 +8,10 @@ CONFIG_SHELL_PROMPT_UART="[iot-contact] "
 CONFIG_NETWORKING=y
 CONFIG_NET_SHELL=y
 CONFIG_NET_SOCKETS=y
+CONFIG_NET_CONNECTION_MANAGER=y
 
 CONFIG_LOG=y
 CONFIG_LOG_BACKEND_NET=y
 CONFIG_LOG_BACKEND_NET_SERVER="[2001:db8::2]:514"
+CONFIG_LOG_BACKEND_NET_AUTOSTART=n
 CONFIG_LOG_MODE_DEFERRED=y
-
-# static IP address configuration is currently required for successful syslog
-CONFIG_NET_CONFIG_SETTINGS=y
-CONFIG_NET_CONFIG_NEED_IPV6=y
-CONFIG_NET_CONFIG_MY_IPV6_ADDR="2001:db8::1"
-CONFIG_NET_IF_UNICAST_IPV6_ADDR_COUNT=3
diff --git a/fw/src/syslog.c b/fw/src/syslog.c
index fb15ab8..3291c0e 100644
--- a/fw/src/syslog.c
+++ b/fw/src/syslog.c
@@ -4,20 +4,68 @@
  * obtain one at https://mozilla.org/MPL/2.0/.
  */
 
+#include <stdbool.h>
+
 #include <zephyr/init.h>
 #include <zephyr/kernel.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/logging/log_backend.h>
+#include <zephyr/logging/log_backend_net.h>
+#include <zephyr/logging/log_ctrl.h>
+#include <zephyr/logging/log_core.h>
+#include <zephyr/net/conn_mgr_connectivity.h>
 
 LOG_MODULE_REGISTER(syslog);
 
-int init_syslog()
+#define L4_EVENT_MASK (NET_EVENT_L4_CONNECTED | NET_EVENT_L4_DISCONNECTED)
+
+struct net_mgmt_event_callback l4_cb;
+static K_SEM_DEFINE(network_connected, 0, 1);
+
+void l4_event_handler(
+	struct net_mgmt_event_callback *cb,
+	uint32_t event,
+	struct net_if *iface)
 {
-	for(int i=0; i<5; i++) {
-		LOG_INF("Informational message number %d", i);
-		k_msleep(1000);
+	switch (event) {
+	case NET_EVENT_L4_CONNECTED:
+		LOG_INF("Network connected");
+		k_sem_give(&network_connected);
+		break;
+	case NET_EVENT_L4_DISCONNECTED:
+		LOG_INF("Network disconnected");
+		break;
+	default:
+		break;
 	}
+}
+
+int init_network_monitoring(void)
+{
+	net_mgmt_init_event_callback(&l4_cb, l4_event_handler, L4_EVENT_MASK);
+	net_mgmt_add_event_callback(&l4_cb);
 
 	return 0;
 }
+SYS_INIT(init_network_monitoring, APPLICATION, 0);
 
+int init_syslog(void)
+{
+	LOG_INF("Waiting for network ...");
+	k_sem_take(&network_connected, K_FOREVER);
+
+	LOG_INF("Enabling syslog backend");
+	const struct log_backend *backend = log_backend_net_get();
+	if (log_backend_is_active(backend) == false) {
+		/* flush log messages to ensure first syslog message is reproducible */
+		while (log_process());
+		log_backend_init(backend);
+		log_backend_enable(backend, backend->cb->ctx, CONFIG_LOG_MAX_LEVEL);
+		LOG_INF("Syslog backend enabled");
+	} else {
+		LOG_INF("Syslog backend was already enabled");
+	}
+
+	return 0;
+}
 SYS_INIT(init_syslog, APPLICATION, 50);
-- 
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