diff --git a/src/platform/silabs/BLEManagerImpl.h b/src/platform/silabs/BLEManagerImpl.h
index 67ea0411b4e362..ac66a3dd044fda 100644
--- a/src/platform/silabs/BLEManagerImpl.h
+++ b/src/platform/silabs/BLEManagerImpl.h
@@ -75,7 +75,7 @@ class BLEManagerImpl final : public BLEManager, private BleLayer, private BlePla
 
 #if CHIP_ENABLE_ADDITIONAL_DATA_ADVERTISING
 #if (SLI_SI91X_ENABLE_BLE || RSI_BLE_ENABLE)
-    static void HandleC3ReadRequest(SilabsBleWrapper::sl_wfx_msg_t * rsi_ble_read_req);
+    static void HandleC3ReadRequest(const SilabsBleWrapper::sl_wfx_msg_t & rsi_ble_read_req);
 #else
 #if CHIP_ENABLE_ADDITIONAL_DATA_ADVERTISING
     static void HandleC3ReadRequest(volatile sl_bt_msg_t * evt);
diff --git a/src/platform/silabs/efr32/BLEManagerImpl.cpp b/src/platform/silabs/efr32/BLEManagerImpl.cpp
index c6307140cad98c..add673e08608ce 100644
--- a/src/platform/silabs/efr32/BLEManagerImpl.cpp
+++ b/src/platform/silabs/efr32/BLEManagerImpl.cpp
@@ -949,6 +949,7 @@ CHIP_ERROR BLEManagerImpl::EncodeAdditionalDataTlv()
 
     err = AdditionalDataPayloadGenerator().generateAdditionalDataPayload(additionalDataPayloadParams, c3AdditionalDataBufferHandle,
                                                                          additionalDataFields);
+    SuccessOrExit(err);
 
 exit:
     if (err != CHIP_NO_ERROR)
diff --git a/src/platform/silabs/rs911x/BLEManagerImpl.cpp b/src/platform/silabs/rs911x/BLEManagerImpl.cpp
index f9884fb458b424..8f64058a7ea1e2 100644
--- a/src/platform/silabs/rs911x/BLEManagerImpl.cpp
+++ b/src/platform/silabs/rs911x/BLEManagerImpl.cpp
@@ -163,6 +163,28 @@ void rsi_ble_add_matter_service(void)
                                                    RSI_BLE_ATT_PROPERTY_READ | RSI_BLE_ATT_PROPERTY_NOTIFY |
                                                    RSI_BLE_ATT_PROPERTY_INDICATE, // Set read, write, write without response
                                                data, sizeof(data), ATT_REC_MAINTAIN_IN_HOST);
+#ifdef CHIP_ENABLE_ADDITIONAL_DATA_ADVERTISING
+    constexpr uuid_t custom_characteristic_C3 = { .size     = RSI_BLE_CUSTOM_CHARACTERISTIC_C3_SIZE,
+                                                  .reserved = { RSI_BLE_CUSTOM_CHARACTERISTIC_C3_RESERVED },
+                                                  .val      = { .val128 = {
+                                                                    .data1 = RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_1,
+                                                                    .data2 = RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_2,
+                                                                    .data3 = RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_3,
+                                                                    .data4 = { RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_4 } } } };
+
+    // Adding custom characteristic declaration to the custom service
+    SilabsBleWrapper::rsi_ble_add_char_serv_att(
+        new_serv_resp.serv_handler, new_serv_resp.start_handle + RSI_BLE_CHARACTERISTIC_C3_ATTRIBUTE_HANDLE_LOCATION,
+        RSI_BLE_ATT_PROPERTY_READ, // Set read
+        new_serv_resp.start_handle + RSI_BLE_CHARACTERISTIC_C3_MEASUREMENT_HANDLE_LOCATION, custom_characteristic_C3);
+
+    // Adding characteristic value attribute to the service
+    SilabsBleWrapper::rsi_ble_add_char_val_att(new_serv_resp.serv_handler,
+                                               new_serv_resp.start_handle + RSI_BLE_CHARACTERISTIC_C3_MEASUREMENT_HANDLE_LOCATION,
+                                               custom_characteristic_C3,
+                                               RSI_BLE_ATT_PROPERTY_READ, // Set read
+                                               data, sizeof(data), ATT_REC_IN_HOST);
+#endif // CHIP_ENABLE_ADDITIONAL_DATA_ADVERTISING
 }
 
 } // namespace
@@ -1028,9 +1050,9 @@ CHIP_ERROR BLEManagerImpl::EncodeAdditionalDataTlv()
     additionalDataFields.Set(AdditionalDataFields::RotatingDeviceId);
 #endif /* CHIP_ENABLE_ROTATING_DEVICE_ID && defined(CHIP_DEVICE_CONFIG_ROTATING_DEVICE_ID_UNIQUE_ID) */
 
-    err = AdditionalDataPayloadGenerator().generateAdditionalDataPayload(additionalDataPayloadParams, c3AdditionalDataBufferHandle,
-                                                                         additionalDataFields);
-
+    err = AdditionalDataPayloadGenerator().generateAdditionalDataPayload(
+        additionalDataPayloadParams, sInstance.c3AdditionalDataBufferHandle, additionalDataFields);
+    SuccessOrExit(err);
 exit:
     if (err != CHIP_NO_ERROR)
     {
diff --git a/src/platform/silabs/rs911x/wfx_sl_ble_init.h b/src/platform/silabs/rs911x/wfx_sl_ble_init.h
index 4eaff9c0677444..8133aef6b69089 100644
--- a/src/platform/silabs/rs911x/wfx_sl_ble_init.h
+++ b/src/platform/silabs/rs911x/wfx_sl_ble_init.h
@@ -71,6 +71,17 @@ extern "C" {
 #define RSI_BLE_CHARACTERISTIC_TX_MEASUREMENT_HANDLE_LOCATION (4)
 #define RSI_BLE_CHARACTERISTIC_TX_GATT_SERVER_CLIENT_HANDLE_LOCATION (5)
 
+#ifdef CHIP_ENABLE_ADDITIONAL_DATA_ADVERTISING
+#define RSI_BLE_CUSTOM_CHARACTERISTIC_C3_SIZE (16)
+#define RSI_BLE_CUSTOM_CHARACTERISTIC_C3_RESERVED 0x00, 0x00, 0x00
+#define RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_1 0x64630238
+#define RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_2 0x8772
+#define RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_3 0x45f2
+#define RSI_BLE_CUSTOM_CHARACTERISTIC_C3_VALUE_128_DATA_4 0x7D, 0xB8, 0x8A, 0x74, 0x04, 0x8F, 0x21, 0x83
+#define RSI_BLE_CHARACTERISTIC_C3_ATTRIBUTE_HANDLE_LOCATION (6)
+#define RSI_BLE_CHARACTERISTIC_C3_MEASUREMENT_HANDLE_LOCATION (7)
+#define RSI_BLE_CHARACTERISTIC_C3_GATT_SERVER_CLIENT_HANDLE_LOCATION (8)
+#endif
 namespace chip {
 namespace DeviceLayer {
 namespace Internal {