fw: app: Move application firmware code here

This makes the structure of the `fw` folder more clear and separates
application-related code from bootloader- or rtos-related code.

1 files changed, 75 insertions, 0 deletions

diff --git a/fw/app/src/syslog.c b/fw/app/src/syslog.c
new file mode 100644
index 0000000..b1a1077
--- /dev/null
+++ b/fw/app/src/syslog.c
@@ -0,0 +1,75 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * 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);
+
+#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)
+{
+	LOG_DBG("Executing L4 event handler");
+
+	switch (event) {
+	case NET_EVENT_L4_CONNECTED:
+		k_sem_give(&network_connected);
+		LOG_INF("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_DBG("Initializing syslog logging backend");
+
+	LOG_DBG("Waiting for network ...");
+	k_sem_take(&network_connected, K_FOREVER);
+
+	LOG_DBG("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);