examples/matter: defer rainmaker start until ble deinit

Starting the rainmaker agent alongside the matter may cause matter commissioning
to fail due to low heap memory. This happens because matter CASE and rainmaker’s
MQTT connection occur simultaneously, and both operations are memory-intensive,
potentially leading to failures.

Author: shubhamdp

examples/matter/matter_light/README.md

@@ -14,3 +14,12 @@
 > Please refer to the [README in the parent folder](../README.md) for instructions.
 
 > Please refer to the [THREAD_INSTRUCTIONS](./THREAD_INSTRUCTIONS.md) for instructions of Thread devices(ESP32-H2 or ESP32-C6).
+
+#### Optimization
+
+TO optimize the DRAM usage, this example uses the following optimizations:
+
+- Disables the chip shell, `CONFIG_ENABLE_CHIP_SHELL=n`, it adds approx 10KB or RAM.
+- As this example has two endpoints (Endpoint 0: Root endpoint, Endpoint 1: Extended Color Light), the default dynamic endpoint count is set to 2. This is done by setting `CONFIG_ESP_MATTER_MAX_ENDPOINT_COUNT=2` in the menuconfig.
+
+For more optimizations please refer [esp-matter’s RAM Flash optimization guide](https://docs.espressif.com/projects/esp-matter/en/latest/esp32/optimizations.html)

examples/matter/matter_light/main/app_main.cpp

@@ -144,9 +144,11 @@ extern "C" void app_main()
 
     /* Pre start */
     ESP_ERROR_CHECK(app_matter_rmaker_start());
-    /* Start the ESP RainMaker Agent */
-    esp_rmaker_start();
+
     rmaker_init_done = true;
 
     app_matter_enable_matter_console();
+
+    // RainMaker start is deferred after Matter commissioning is complete
+    // and BLE memory is reclaimed, so that MQTT connect doesnt fail.
 }

examples/matter/matter_light/main/app_matter_light.cpp

@@ -212,6 +212,14 @@ void app_event_cb(const ChipDeviceEvent *event, intptr_t arg)
     case chip::DeviceLayer::DeviceEventType::kFabricCommitted:
         ESP_LOGI(TAG, "Fabric is committed");
         break;
+
+    case chip::DeviceLayer::DeviceEventType::kBLEDeinitialized:
+        ESP_LOGI(TAG, "BLE deinitialized and memory reclaimed");
+        // Starting RainMaker after Matter commissioning is complete
+        // and BLE memory is reclaimed, so that MQTT connect doesn't fail.
+        esp_rmaker_start();
+        break;
+
     default:
         break;
     }

examples/matter/matter_light/sdkconfig.defaults

@@ -81,3 +81,7 @@ CONFIG_ESP_INSIGHTS_TRANSPORT_MQTT=y
 CONFIG_COMPILER_OPTIMIZATION_SIZE=y
 CONFIG_COMPILER_OPTIMIZATION_ASSERTIONS_SILENT=y
 CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y
+
+# DRAM optimization
+CONFIG_ENABLE_CHIP_SHELL=n
+CONFIG_ESP_MATTER_MAX_DYNAMIC_ENDPOINT_COUNT=2

examples/matter/matter_switch/README.md

@@ -10,3 +10,12 @@
 - To test remote control, change the network connection of the mobile.
 
 > Please refer to the [README in the parent folder](../README.md) for instructions.
+
+#### Optimization
+
+TO optimize the DRAM usage, this example uses the following optimizations:
+
+- Disables the chip shell, `CONFIG_ENABLE_CHIP_SHELL=n`, it adds approx 10KB or RAM.
+- As this example has two endpoints (Endpoint 0: Root endpoint, Endpoint 1: Extended Color Light), the default dynamic endpoint count is set to 2. This is done by setting `CONFIG_ESP_MATTER_MAX_ENDPOINT_COUNT=2` in the menuconfig.
+
+For more optimizations please refer [esp-matter’s RAM Flash optimization guide](https://docs.espressif.com/projects/esp-matter/en/latest/esp32/optimizations.html)

examples/matter/matter_switch/main/app_main.cpp

@@ -26,8 +26,6 @@ static const char *TAG = "app_main";
 
 static app_driver_handle_t switch_handle;
 
-bool rmaker_init_done = false; // used with extern in `app_matter.c`
-
 /* Callback to handle commands received from the RainMaker cloud */
 static esp_err_t write_cb(const esp_rmaker_device_t *device, const esp_rmaker_param_t *param,
                           const esp_rmaker_param_val_t val, void *priv_data, esp_rmaker_write_ctx_t *ctx)
@@ -86,7 +84,6 @@ extern "C" void app_main()
     esp_rmaker_device_t *switch_device = esp_rmaker_switch_device_create(SWITCH_DEVICE_NAME, NULL, DEFAULT_POWER);
     esp_rmaker_device_add_cb(switch_device, write_cb, NULL);
 
-
     esp_rmaker_node_add_device(node, switch_device);
 
     /* Enable OTA */
@@ -114,10 +111,9 @@ extern "C" void app_main()
     /* Pre start */
     ESP_ERROR_CHECK(app_matter_rmaker_start());
 
-    /* Start the ESP RainMaker Agent */
-    esp_rmaker_start();
-    rmaker_init_done = true;
-
     /* Enable Matter diagnostics console*/
     app_matter_enable_matter_console();
+
+    // RainMaker start is deferred after Matter commissioning is complete
+    // and BLE memory is reclaimed, so that MQTT connect doesnt fail.
 }

examples/matter/matter_switch/main/app_matter_switch.cpp

@@ -70,6 +70,13 @@ void app_event_cb(const ChipDeviceEvent *event, intptr_t arg)
         ESP_LOGI(TAG, "Commissioning complete");
         break;
 
+    case chip::DeviceLayer::DeviceEventType::PublicEventTypes::kBLEDeinitialized:
+        ESP_LOGI(TAG, "BLE deinitialized and memory reclaimed");
+        // Starting RainMaker after Matter commissioning is complete
+        // and BLE memory is reclaimed, so that MQTT connect doesn't fail.
+        esp_rmaker_start();
+        break;
+
     default:
         break;
     }

examples/matter/matter_switch/main/app_priv.h

@@ -54,4 +54,4 @@ esp_err_t app_attribute_update_cb(esp_matter::attribute::callback_type_t type, u
 esp_err_t app_identification_cb(esp_matter::identification::callback_type_t type, uint16_t endpoint_id, uint8_t effect_id,
                                        uint8_t effect_variant, void *priv_data);
 
-void app_event_cb(const ChipDeviceEvent *event, intptr_t arg);
+void app_event_cb(const ChipDeviceEvent *event, intptr_t arg);

examples/matter/matter_switch/sdkconfig.defaults

@@ -81,3 +81,7 @@ CONFIG_ESP_INSIGHTS_TRANSPORT_MQTT=y
 CONFIG_COMPILER_OPTIMIZATION_SIZE=y
 CONFIG_COMPILER_OPTIMIZATION_ASSERTIONS_SILENT=y
 CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y
+
+# DRAM optimization
+CONFIG_ENABLE_CHIP_SHELL=n
+CONFIG_ESP_MATTER_MAX_DYNAMIC_ENDPOINT_COUNT=2