samples: logging: dictionary: Add support for runtime filtering

Extend sample with configuration which has shell on one UART and
UART dictionary based frontend on another. Shell commands can be used
to control runtime filtering of logging messages for the frontend and
shell backend.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>

samples/subsys/logging/dictionary/README.rst

@@ -11,6 +11,13 @@ This is a sample app which utilizes :ref:`dictionary-based logging <logging_guid
 the UART backend. This is configured to output binary log data
 in hexadecimal so it could be run in terminal.
 
+There is also a configuration which shows how shell commands can be used to configure runtime
+filtering of the logging messages for the frontend (in the same way as it is done for backends).
+See ``log frontend`` set of commands and use ``log_rt_demo`` command to test the filtering.
+
+Configuration with shell requires that board has two UART devices (one for the shell and one for
+the UART dictionary based frontend).
+
 
 Building and Running
 ********************

samples/subsys/logging/dictionary/boards/nrf5340dk_nrf5340_cpuapp.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2024 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+/ {
+
+	chosen {
+		zephyr,shell-uart = &uart1;
+	};
+};
+
+&uart1 {
+	status = "okay";
+};

samples/subsys/logging/dictionary/sample.yaml

@@ -41,6 +41,22 @@ tests:
       - CONFIG_LOG_FRONTEND=y
       - CONFIG_LOG_FRONTEND_ONLY=y
       - CONFIG_LOG_FRONTEND_DICT_UART=y
+  sample.logger.basic.dictionary.uart_frontend_rt:
+    build_only: true
+    tags: logging
+    platform_allow: nrf5340dk_nrf5340_cpuapp
+    integration_platforms:
+      - nrf5340dk_nrf5340_cpuapp
+    extra_configs:
+      - CONFIG_SHELL=y
+      - CONFIG_LOG_RUNTIME_FILTERING=y
+      - CONFIG_LOG_CMDS=y
+      - CONFIG_LOG_BACKEND_RTT=n
+      - CONFIG_LOG_BACKEND_UART=n
+      - CONFIG_UART_ASYNC_API=y
+      - CONFIG_UART_INTERRUPT_DRIVEN=n
+      - CONFIG_LOG_FRONTEND=y
+      - CONFIG_LOG_FRONTEND_DICT_UART=y
   sample.logger.basic.dictionary.uart_int_frontend:
     build_only: true
     tags: logging

samples/subsys/logging/dictionary/src/main.c

@@ -10,8 +10,9 @@
 #include <string.h>
 #include <zephyr/sys/printk.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/shell/shell.h>
 
-LOG_MODULE_REGISTER(hello_world, 4);
+LOG_MODULE_REGISTER(hello_world, LOG_LEVEL_DBG);
 
 static const char *hexdump_msg = "HEXDUMP! HEXDUMP@ HEXDUMP#";
 
@@ -72,3 +73,16 @@ int main(void)
 #endif
 	return 0;
 }
+
+static int rt_demo_cmd(const struct shell *sh, size_t argc, char **argv)
+{
+	ARG_UNUSED(sh);
+	LOG_ERR("demo %s", argc > 1 ? argv[1] : "");
+	LOG_WRN("demo %s", argc > 1 ? argv[1] : "");
+	LOG_INF("demo %s", argc > 1 ? argv[1] : "");
+	LOG_DBG("demo %s", argc > 1 ? argv[1] : "");
+
+	return 0;
+}
+
+SHELL_CMD_REGISTER(log_rt_demo, NULL, "Command can be used to test runtime filtering", rt_demo_cmd);