fw: syslog: Add static syslog logging

Network-based logging via the syslog protocol allows to log from many
IoT devices to a central log server.

This makes reading logs way easier. Choosing UDP removes the need for
logic keeping a state. Maybe dropped packages are acceptable for the use
case but should be rare anyway.

4 files changed, 36 insertions, 1 deletions

diff --git a/fw/CMakeLists.txt b/fw/CMakeLists.txt
index 6ba8cec..522a4dd 100644
--- a/fw/CMakeLists.txt
+++ b/fw/CMakeLists.txt
@@ -20,4 +20,5 @@ project(iot-contact-fw)
 target_sources(app
 	PRIVATE
 		"${CMAKE_CURRENT_SOURCE_DIR}/src/main.c"
+		"${CMAKE_CURRENT_SOURCE_DIR}/src/syslog.c"
 )
diff --git a/fw/prj.conf b/fw/prj.conf
index 9c84c48..9ac1b51 100644
--- a/fw/prj.conf
+++ b/fw/prj.conf
@@ -7,3 +7,15 @@ CONFIG_SHELL_PROMPT_UART="[iot-contact] "
 
 CONFIG_NETWORKING=y
 CONFIG_NET_SHELL=y
+CONFIG_NET_SOCKETS=y
+
+CONFIG_LOG=y
+CONFIG_LOG_BACKEND_NET=y
+CONFIG_LOG_BACKEND_NET_SERVER="[2001:db8::2]:514"
+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/main.c b/fw/src/main.c
index 228422c..faba14b 100644
--- a/fw/src/main.c
+++ b/fw/src/main.c
@@ -4,7 +4,6 @@
  * obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-
 int main(void)
 {
 	return 0;
diff --git a/fw/src/syslog.c b/fw/src/syslog.c
new file mode 100644
index 0000000..fb15ab8
--- /dev/null
+++ b/fw/src/syslog.c
@@ -0,0 +1,23 @@
+/*
+ * 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 <zephyr/init.h>
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(syslog);
+
+int init_syslog()
+{
+	for(int i=0; i<5; i++) {
+		LOG_INF("Informational message number %d", i);
+		k_msleep(1000);
+	}
+
+	return 0;
+}
+
+SYS_INIT(init_syslog, APPLICATION, 50);