samples: combained Matter + Zigbee Application rework

- Created two separate app tasks for Matter and Zigbee.
- Combained two protocols in the main.cpp file.
- Rework of configuration to be compliant with Matter.
- Added a variant to sample.yaml.
- Fixed nrf54lm20 configuration.

Signed-off-by: Arkadiusz Balys <arkadiusz.balys@nordicsemi.no>

Author: ArekBalysNordic

.gitignore

@@ -9,6 +9,7 @@ __pycache__/
 
 # build
 /build*
+/samples/**/build*
 /twister-out*
 
 # docs

samples/light_bulb/CMakeLists.txt

@@ -18,7 +18,10 @@ project("Zigbee + Matter Light Bulb with FOTA")
 if(CONFIG_CHIP)
     # Enable GNU STD support for Matter
     include(${ZEPHYR_CONNECTEDHOMEIP_MODULE_DIR}/config/nrfconnect/app/enable-gnu-std.cmake)
-    
+
+    # Include all source files that are located in the Matter common directory.
+    include(${ZEPHYR_NRF_MODULE_DIR}/samples/matter/common/cmake/source_common.cmake)
+
     # Include Data Model utils (simplified for Zigbee coexistence)
     include(${ZEPHYR_NRF_MODULE_DIR}/samples/matter/common/cmake/data_model.cmake)
 
@@ -35,16 +38,19 @@ if(CONFIG_CHIP)
 
     # NORDIC SDK APP START
     target_sources(app PRIVATE
-        src/main_matter.c
-        src/matter_init.cpp
+        src/main.cpp
+        src/app_task_zigbee.cpp
+        src/app_task_matter.cpp
+        ${CHIP_ROOT}/src/app/persistence/DeferredAttributePersistenceProvider.cpp
     )
 
     ncs_configure_data_model()
     # NORDIC SDK APP END
 else()
     # Zigbee-only build
     target_sources(app PRIVATE
-        src/main.c
+        src/main.cpp
+        src/app_task_zigbee.cpp
     )
 
     target_include_directories(app PRIVATE include)

samples/light_bulb/CMakeLists_matter.txt

@@ -4,7 +4,26 @@
 # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 #
 
-source "Kconfig.zephyr"
+# Sample configuration used for Thread networking
+if OPENTHREAD
+
+choice OPENTHREAD_NORDIC_LIBRARY_CONFIGURATION
+	default OPENTHREAD_NORDIC_LIBRARY_FTD
+endchoice
+
+choice OPENTHREAD_DEVICE_TYPE
+	default OPENTHREAD_FTD
+endchoice
+
+endif # OPENTHREAD
 
-# Include Matter common sample Kconfig if Matter is enabled
-rsource "$(ZEPHYR_NRF_MODULE_DIR)/samples/matter/common/src/Kconfig"
+config MPSL_THREAD_COOP_PRIO
+	default 8
+
+if CHIP
+source "$(ZEPHYR_CONNECTEDHOMEIP_MODULE_DIR)/config/nrfconnect/chip-module/Kconfig.features"
+source "$(ZEPHYR_CONNECTEDHOMEIP_MODULE_DIR)/config/nrfconnect/chip-module/Kconfig.defaults"
+source "$(ZEPHYR_NRF_MODULE_DIR)/samples/matter/common/src/Kconfig"
+endif
+
+source "Kconfig.zephyr"

samples/light_bulb/Kconfig

@@ -69,7 +69,3 @@ config DFU_MULTI_IMAGE_PACKAGE_NET
 endif # SOC_SERIES_NRF53X
 
 endif # BOOTLOADER_MCUBOOT
-
-#### Enable generating Matter factory data
-config MATTER_FACTORY_DATA_GENERATE
-	default y

samples/light_bulb/Kconfig_sysbuild_matter_fota

@@ -6,7 +6,13 @@
 
 / {
 	chosen {
-		ncs,zigbee-timer = &timer24;
+		ncs,zigbee-timer = &timer23;
+		ncs,zboss-trace-uart = &uart20;
+	};
+
+	aliases {
+		/* Configure PWM module for led1 (LED2 on the board) */
+		pwm-led1 = &pwm_led3;
 	};
 
 	pwmleds {
@@ -17,16 +23,6 @@
 	};
 };
 
-// restore full RRAM and SRAM space - by default some parts are dedicated to FLRP
-&cpuapp_rram {
-	reg = <0x0 DT_SIZE_K(2036)>;
-};
-
-&cpuapp_sram {
-	reg = <0x20000000 DT_SIZE_K(512)>;
-	ranges = <0x0 0x20000000 DT_SIZE_K(512)>;
-};
-
 &pwm20 {
 	status = "okay";
 	pinctrl-0 = <&pwm_default>;
@@ -48,6 +44,6 @@
 	};
 };
 
-&timer24 {
+&timer23 {
 	status = "okay";
 };

samples/light_bulb/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2026 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#pragma once
+
+#include "board/board.h"
+#include "pwm/pwm_device.h"
+
+#include <platform/CHIPDeviceLayer.h>
+
+struct k_timer;
+struct Identify;
+
+enum class LightingActor : uint8_t { Remote, Button };
+
+struct LightingEvent {
+  uint8_t Action;
+  LightingActor Actor;
+};
+
+class AppTask {
+public:
+  static AppTask &Instance() {
+    static AppTask sAppTask;
+    return sAppTask;
+  };
+
+  CHIP_ERROR StartApp();
+
+  void UpdateClusterState();
+  void InitPWMDDevice();
+  Nrf::PWMDevice &GetPWMDevice() { return mPWMDevice; }
+
+private:
+  CHIP_ERROR Init();
+
+  static void LightingActionEventHandler(const LightingEvent &event);
+  static void ButtonEventHandler(Nrf::ButtonState state,
+                                 Nrf::ButtonMask hasChanged);
+
+  static void ActionInitiated(Nrf::PWMDevice::Action_t action, int32_t actor);
+  static void ActionCompleted(Nrf::PWMDevice::Action_t action, int32_t actor);
+
+  Nrf::PWMDevice mPWMDevice;
+};

samples/light_bulb/include/app_task_matter.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2026 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#ifndef APP_TASK_ZIGBEE_H
+#define APP_TASK_ZIGBEE_H 1
+
+void ZigbeeStart(void);
+
+#endif /* APP_TASK_ZIGBEE_H */