diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6711474b..eada4f53 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ if (HALST_STANDALONE)
     FetchContent_Declare(
         emil
         GIT_REPOSITORY https://github.com/philips-software/amp-embedded-infra-lib.git
-        GIT_TAG        f38e0ac947cf81a1d48ffd79b079ac3f8c20ccac # unreleased
+        GIT_TAG        0d8f096330aca30e935f84caf6b3c76c176cec34 # unreleased
     )
     FetchContent_MakeAvailable(emil)
 
diff --git a/hal_st/middlewares/ble_middleware/GapSt.cpp b/hal_st/middlewares/ble_middleware/GapSt.cpp
index 2f360668..7ee29c71 100644
--- a/hal_st/middlewares/ble_middleware/GapSt.cpp
+++ b/hal_st/middlewares/ble_middleware/GapSt.cpp
@@ -62,17 +62,6 @@ namespace hal
         SVCCTL_Init();
     }
 
-    uint16_t GapSt::EffectiveMaxAttMtuSize() const
-    {
-        return maxAttMtu;
-    }
-
-    void GapSt::MtuExchange()
-    {
-        auto status = aci_gatt_exchange_config(this->connectionContext.connectionHandle);
-        assert(status == BLE_STATUS_SUCCESS);
-    }
-
     void GapSt::RemoveAllBonds()
     {
         bondStorageSynchronizer.RemoveAllBonds();
@@ -229,11 +218,11 @@ namespace hal
     void GapSt::HandleMtuExchangeResponseEvent(const aci_att_exchange_mtu_resp_event_rp0& event)
     {
         really_assert(event.Connection_Handle == connectionContext.connectionHandle);
-        maxAttMtu = event.Server_RX_MTU;
+        SetAttMtu(event.Server_RX_MTU);
 
-        AttMtuExchange::NotifyObservers([](auto& observer)
+        services::AttMtuExchange::NotifyObservers([](auto& observer)
             {
-                observer.ExchangedMaxAttMtuSize();
+                observer.ExchangedAttMtuSize();
             });
     }
 
@@ -385,7 +374,7 @@ namespace hal
 
     void GapSt::SetConnectionContext(uint16_t connectionHandle, services::GapDeviceAddressType peerAddressType, const uint8_t* peerAddress)
     {
-        maxAttMtu = defaultMaxAttMtuSize;
+        SetAttMtu(defaultAttMtuSize);
         connectionContext.connectionHandle = connectionHandle;
         connectionContext.peerAddressType = peerAddressType;
         std::copy_n(peerAddress, connectionContext.peerAddress.size(), std::begin(connectionContext.peerAddress));
diff --git a/hal_st/middlewares/ble_middleware/GapSt.hpp b/hal_st/middlewares/ble_middleware/GapSt.hpp
index acedf3f7..f65c61a1 100644
--- a/hal_st/middlewares/ble_middleware/GapSt.hpp
+++ b/hal_st/middlewares/ble_middleware/GapSt.hpp
@@ -12,7 +12,7 @@
 namespace hal
 {
     class GapSt
-        : public services::AttMtuExchange
+        : public services::AttMtuExchangeImpl
         , public services::GapBonding
         , public services::GapPairing
         , private HciEventSink
@@ -51,10 +51,6 @@ namespace hal
             bool privacy;
         };
 
-        // Implementation of AttMtuExchange
-        uint16_t EffectiveMaxAttMtuSize() const override;
-        void MtuExchange() override;
-
         // Implementation of GapBonding
         void RemoveAllBonds() override;
         void RemoveOldestBond() override;
@@ -142,7 +138,6 @@ namespace hal
 
     private:
         services::BondStorageSynchronizer& bondStorageSynchronizer;
-        uint16_t maxAttMtu = defaultMaxAttMtuSize;
     };
 }
 
diff --git a/hal_st/middlewares/ble_middleware/GattClientSt.cpp b/hal_st/middlewares/ble_middleware/GattClientSt.cpp
index 544cab5a..bde03179 100644
--- a/hal_st/middlewares/ble_middleware/GattClientSt.cpp
+++ b/hal_st/middlewares/ble_middleware/GattClientSt.cpp
@@ -18,7 +18,7 @@ namespace hal
 
     void GattClientSt::StartServiceDiscovery()
     {
-        onDiscoveryCompletion = [this](services::OperationStatus status)
+        onOperationDone = [this](services::OperationStatus status)
         {
             infra::Subject<services::GattClientObserver>::NotifyObservers([status](auto& observer)
                 {
@@ -27,13 +27,12 @@ namespace hal
         };
 
         auto ret = aci_gatt_disc_all_primary_services(connectionHandle);
-        if (ret != BLE_STATUS_SUCCESS)
-            onDiscoveryCompletion(services::OperationStatus::error);
+        HandleBleStatusError(ret);
     }
 
     void GattClientSt::StartCharacteristicDiscovery(services::AttAttribute::Handle handle, services::AttAttribute::Handle endHandle)
     {
-        onDiscoveryCompletion = [this](services::OperationStatus status)
+        onOperationDone = [this](services::OperationStatus status)
         {
             infra::Subject<services::GattClientObserver>::NotifyObservers([status](auto& observer)
                 {
@@ -42,13 +41,12 @@ namespace hal
         };
 
         auto ret = aci_gatt_disc_all_char_of_service(connectionHandle, handle, endHandle);
-        if (ret != BLE_STATUS_SUCCESS)
-            onDiscoveryCompletion(services::OperationStatus::error);
+        HandleBleStatusError(ret);
     }
 
     void GattClientSt::StartDescriptorDiscovery(services::AttAttribute::Handle handle, services::AttAttribute::Handle endHandle)
     {
-        onDiscoveryCompletion = [this](services::OperationStatus status)
+        onOperationDone = [this](services::OperationStatus status)
         {
             infra::Subject<services::GattClientObserver>::NotifyObservers([status](auto& observer)
                 {
@@ -57,41 +55,32 @@ namespace hal
         };
 
         auto ret = aci_gatt_disc_all_char_desc(connectionHandle, handle, endHandle);
-        if (ret != BLE_STATUS_SUCCESS)
-            onDiscoveryCompletion(services::OperationStatus::error);
+        HandleBleStatusError(ret);
     }
 
     void GattClientSt::Read(services::AttAttribute::Handle handle, const infra::Function<void(const infra::ConstByteRange&)>& onResponse, const infra::Function<void(services::OperationStatus)>& onDone)
     {
-        this->onReadResponse = onResponse;
-        this->onCharacteristicOperationsDone = [this, onDone](services::OperationStatus result)
-        {
-            onDone(result);
-        };
+        onReadResponse = onResponse;
+        onOperationDone = onDone;
 
         auto ret = aci_gatt_read_char_value(connectionHandle, handle);
-        if (ret != BLE_STATUS_SUCCESS)
-            this->onCharacteristicOperationsDone(services::OperationStatus::error);
+        HandleBleStatusError(ret);
     }
 
     void GattClientSt::Write(services::AttAttribute::Handle handle, infra::ConstByteRange data, const infra::Function<void(services::OperationStatus)>& onDone)
     {
-        this->onCharacteristicOperationsDone = [this, onDone](services::OperationStatus result)
-        {
-            onDone(result);
-        };
+        onOperationDone = onDone;
 
         auto ret = aci_gatt_write_char_value(connectionHandle, handle, data.size(), data.cbegin());
-        if (ret != BLE_STATUS_SUCCESS)
-            this->onCharacteristicOperationsDone(services::OperationStatus::error);
+        HandleBleStatusError(ret);
     }
 
     void GattClientSt::WriteWithoutResponse(services::AttAttribute::Handle handle, infra::ConstByteRange data, const infra::Function<void(services::OperationStatus)>& onDone)
     {
-        auto var = aci_gatt_write_without_resp(connectionHandle, handle, data.size(), data.cbegin());
-        if (var == BLE_STATUS_SUCCESS)
+        auto ret = aci_gatt_write_without_resp(connectionHandle, handle, data.size(), data.cbegin());
+        if (ret == BLE_STATUS_SUCCESS)
             onDone(services::OperationStatus::success);
-        else if (var == BLE_STATUS_INSUFFICIENT_RESOURCES)
+        else if (ret == BLE_STATUS_INSUFFICIENT_RESOURCES)
             onDone(services::OperationStatus::retry);
         else
             onDone(services::OperationStatus::error);
@@ -216,10 +205,9 @@ namespace hal
 
     void GattClientSt::HandleGattCompleteResponse(const aci_gatt_proc_complete_event_rp0& event)
     {
-        if (this->onDiscoveryCompletion)
-            this->onDiscoveryCompletion(event.Error_Code == BLE_STATUS_SUCCESS ? services::OperationStatus::success : services::OperationStatus::error); // Does this conflict with other operations? If not, why do we even get a GattComplete for discovery?
-        else if (this->onCharacteristicOperationsDone)
-            this->onCharacteristicOperationsDone(event.Error_Code == BLE_STATUS_SUCCESS ? services::OperationStatus::success : services::OperationStatus::error);
+        really_assert(onOperationDone);
+
+        onOperationDone(event.Error_Code == BLE_STATUS_SUCCESS ? services::OperationStatus::success : services::OperationStatus::error);
     }
 
     void GattClientSt::HandleHciLeConnectionCompleteEvent(const hci_le_connection_complete_event_rp0& event)
@@ -262,7 +250,7 @@ namespace hal
             {
                 observer.IndicationReceived(event.Attribute_Handle, data, [this]()
                     {
-                        this->HandleGattConfirmIndication();
+                        HandleGattConfirmIndication();
                     });
             });
     }
@@ -358,7 +346,31 @@ namespace hal
         const uint16_t offsetCccd = 1;
 
         auto ret = aci_gatt_write_char_desc(connectionHandle, handle + offsetCccd, sizeof(characteristicValue), reinterpret_cast<uint8_t*>(&characteristicValue));
-        if (ret != BLE_STATUS_SUCCESS)
-            onCharacteristicOperationsDone(services::OperationStatus::error);
+        HandleBleStatusError(ret);
+    }
+
+    void GattClientSt::MtuExchange(const infra::Function<void(services::OperationStatus)>& onDone)
+    {
+        onOperationDone = onDone;
+
+        auto status = aci_gatt_exchange_config(connectionHandle);
+        HandleBleStatusError(status);
+    }
+
+    void GattClientSt::HandleAttExchangeMtuResponse(const aci_att_exchange_mtu_resp_event_rp0& event)
+    {
+        really_assert(event.Connection_Handle == connectionHandle);
+        SetAttMtu(event.Server_RX_MTU);
+
+        AttMtuExchange::NotifyObservers([](auto& observer)
+            {
+                observer.ExchangedAttMtuSize();
+            });
+    }
+
+    void GattClientSt::HandleBleStatusError(tBleStatus status)
+    {
+        if (status != BLE_STATUS_SUCCESS)
+            onOperationDone(services::OperationStatus::error);
     }
 }
diff --git a/hal_st/middlewares/ble_middleware/GattClientSt.hpp b/hal_st/middlewares/ble_middleware/GattClientSt.hpp
index 7eef58dd..57a60a3d 100644
--- a/hal_st/middlewares/ble_middleware/GattClientSt.hpp
+++ b/hal_st/middlewares/ble_middleware/GattClientSt.hpp
@@ -7,6 +7,7 @@
 #include "infra/util/AutoResetFunction.hpp"
 #include "infra/util/BoundedVector.hpp"
 #include "infra/util/Function.hpp"
+#include "services/ble/Gatt.hpp"
 #include "services/ble/GattClient.hpp"
 
 namespace hal
@@ -14,6 +15,7 @@ namespace hal
     class GattClientSt
         : public services::GattClient
         , public hal::HciEventSink
+        , public services::AttMtuExchangeImpl
     {
     public:
         explicit GattClientSt(hal::HciEventSource& hciEventSource);
@@ -29,6 +31,7 @@ namespace hal
         void DisableNotification(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone) override;
         void EnableIndication(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone) override;
         void DisableIndication(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone) override;
+        void MtuExchange(const infra::Function<void(services::OperationStatus)>& onDone) override;
 
         // Implementation of hal::HciEventSink
         void HciEvent(hci_event_pckt& event) override;
@@ -50,6 +53,7 @@ namespace hal
         virtual void HandleAttReadByGroupTypeResponse(const aci_att_read_by_group_type_resp_event_rp0& event);
         virtual void HandleAttReadByTypeResponse(const aci_att_read_by_type_resp_event_rp0& event);
         virtual void HandleAttFindInfoResponse(const aci_att_find_info_resp_event_rp0& event);
+        virtual void HandleAttExchangeMtuResponse(const aci_att_exchange_mtu_resp_event_rp0& event);
 
         virtual void HandleServiceDiscovered(infra::DataInputStream& stream, bool isUuid16);
         void HandleUuidFromDiscovery(infra::DataInputStream& stream, bool isUuid16, services::AttAttribute::Uuid& type);
@@ -59,11 +63,12 @@ namespace hal
         void HandleDescriptorDiscovered(infra::DataInputStream& stream, bool isUuid16);
 
         void WriteCharacteristicDescriptor(services::AttAttribute::Handle handle, services::GattCharacteristic::PropertyFlags property, services::GattDescriptor::ClientCharacteristicConfiguration::CharacteristicValue characteristicValue);
+        void HandleBleStatusError(tBleStatus status);
 
         template<services::GattCharacteristic::PropertyFlags p, services::GattDescriptor::ClientCharacteristicConfiguration::CharacteristicValue v>
         void WriteCharacteristicDescriptor(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone)
         {
-            this->onCharacteristicOperationsDone = [this, onDone](services::OperationStatus result)
+            this->onOperationDone = [this, onDone](services::OperationStatus result)
             {
                 onDone(result);
             };
@@ -85,9 +90,8 @@ namespace hal
 
         static constexpr uint16_t invalidConnection = 0xffff;
 
-        infra::AutoResetFunction<void(services::OperationStatus status)> onDiscoveryCompletion;
         infra::AutoResetFunction<void(const infra::ConstByteRange&)> onReadResponse;
-        infra::AutoResetFunction<void(services::OperationStatus), sizeof(void*) + sizeof(infra::Function<void(services::OperationStatus)>)> onCharacteristicOperationsDone;
+        infra::AutoResetFunction<void(services::OperationStatus), sizeof(void*) + sizeof(infra::Function<void(services::OperationStatus)>)> onOperationDone;
     };
 }
 
diff --git a/hal_st/middlewares/ble_middleware/GattServerSt.hpp b/hal_st/middlewares/ble_middleware/GattServerSt.hpp
index b0d0388e..dd352e2d 100644
--- a/hal_st/middlewares/ble_middleware/GattServerSt.hpp
+++ b/hal_st/middlewares/ble_middleware/GattServerSt.hpp
@@ -3,6 +3,7 @@
 
 #include "ble/ble.h"
 #include "hal_st/middlewares/ble_middleware/HciEventObserver.hpp"
+#include "services/ble/Gatt.hpp"
 #include "services/ble/GattServer.hpp"
 
 namespace hal
@@ -11,6 +12,8 @@ namespace hal
         : public services::GattServer
         , public services::GattServerCharacteristicOperations
         , public hal::HciEventSink
+        , public services::AttMtuExchangeImpl
+
     {
     public:
         explicit GattServerSt(hal::HciEventSource& hciEventSource);
diff --git a/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.cpp b/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.cpp
index 20afaa5f..408be575 100644
--- a/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.cpp
+++ b/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.cpp
@@ -99,8 +99,8 @@ namespace
     void ShciCore2Init(const hal::SystemTransportLayerWb::Configuration& configuration)
     {
         const uint8_t maxNumberOfBleLinks = 0x01;
-        const uint8_t prepareWriteListSize = BLE_PREP_WRITE_X_ATT(configuration.maxAttMtuSize);
-        const uint8_t numberOfBleMemoryBlocks = BLE_MBLOCKS_CALC(prepareWriteListSize, configuration.maxAttMtuSize, maxNumberOfBleLinks);
+        const uint8_t prepareWriteListSize = BLE_PREP_WRITE_X_ATT(configuration.attMtuSize);
+        const uint8_t numberOfBleMemoryBlocks = BLE_MBLOCKS_CALC(prepareWriteListSize, configuration.attMtuSize, maxNumberOfBleLinks);
         const uint8_t bleStackOptions = (SHCI_C2_BLE_INIT_OPTIONS_LL_HOST | SHCI_C2_BLE_INIT_OPTIONS_WITH_SVC_CHANGE_DESC | SHCI_C2_BLE_INIT_OPTIONS_DEVICE_NAME_RO | SHCI_C2_BLE_INIT_OPTIONS_NO_EXT_ADV | SHCI_C2_BLE_INIT_OPTIONS_NO_CS_ALGO2 |
                                          SHCI_C2_BLE_INIT_OPTIONS_FULL_GATTDB_NVM | SHCI_C2_BLE_INIT_OPTIONS_GATT_CACHING_NOTUSED | SHCI_C2_BLE_INIT_OPTIONS_POWER_CLASS_2_3 | SHCI_C2_BLE_INIT_OPTIONS_APPEARANCE_READONLY | SHCI_C2_BLE_INIT_OPTIONS_ENHANCED_ATT_NOTSUPPORTED);
 
@@ -130,7 +130,7 @@ namespace
                 0x01, // Enable or disable the Extended Packet length feature
                 prepareWriteListSize,
                 numberOfBleMemoryBlocks,
-                configuration.maxAttMtuSize,
+                configuration.attMtuSize,
                 0x1FA,                                        // Sleep clock accuracy in Slave mode
                 0x00,                                         // Sleep clock accuracy in Master mode
                 ToLowSpeedClock(configuration.rfWakeupClock), // Source for the low speed clock for RF wake-up
@@ -163,8 +163,8 @@ namespace hal
         , configuration(configuration)
         , onInitialized(onInitialized)
     {
-        really_assert(configuration.maxAttMtuSize >= BLE_DEFAULT_ATT_MTU && configuration.maxAttMtuSize <= 251);
-        // BLE middleware supported maxAttMtuSize = 512. Current usage of library limits maxAttMtuSize to 251 (max HCI buffer size)
+        really_assert(configuration.attMtuSize >= BLE_DEFAULT_ATT_MTU && configuration.attMtuSize <= 251);
+        // BLE middleware supported attMtuSize = 512. Current usage of library limits attMtuSize to 251 (max HCI buffer size)
 
         TL_Init();
         ShciInit();
diff --git a/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.hpp b/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.hpp
index b66991b1..0aa8f5b1 100644
--- a/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.hpp
+++ b/hal_st/middlewares/ble_middleware/SystemTransportLayerWb.hpp
@@ -24,7 +24,7 @@ namespace hal
 
         struct Configuration
         {
-            uint16_t maxAttMtuSize;
+            uint16_t attMtuSize;
             RfWakeupClock rfWakeupClock;
         };
 
diff --git a/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.cpp b/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.cpp
index 7bd8e706..945baed8 100644
--- a/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.cpp
+++ b/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.cpp
@@ -2,8 +2,8 @@
 #include <array>
 extern "C"
 {
-#include "ble_common.h"
 #include "ble_bufsize.h"
+#include "ble_common.h"
 #include "blestack.h"
 }
 
@@ -21,7 +21,7 @@ extern "C"
 
     tBleStatus ProcessEventPacket(const uint8_t* data)
     {
-        SVCCTL_UserEvtRx(const_cast<uint8_t *>(data));
+        SVCCTL_UserEvtRx(const_cast<uint8_t*>(data));
         return BLE_STATUS_SUCCESS;
     }
 
@@ -50,18 +50,18 @@ namespace
     std::array<uint32_t, DIVC(gattBufferSize, 4)> bleGattBuffer;
     const uint8_t bleStackOptions = 0;
 
-    constexpr uint8_t PrepareWriteListSize(uint16_t maxAttMtuSize)
+    constexpr uint8_t PrepareWriteListSize(uint16_t attMtuSize)
     {
-        return static_cast<uint8_t>(BLE_PREP_WRITE_X_ATT(maxAttMtuSize));
+        return static_cast<uint8_t>(BLE_PREP_WRITE_X_ATT(attMtuSize));
     }
 }
 
 namespace hal
 {
-    SystemTransportLayerWba::SystemTransportLayerWba(uint16_t maxAttMtuSize)
+    SystemTransportLayerWba::SystemTransportLayerWba(uint16_t attMtuSize)
     {
-        really_assert(maxAttMtuSize >= BLE_DEFAULT_ATT_MTU && maxAttMtuSize <= 251);
-        // BLE middleware supported maxAttMtuSize = 512. Current usage of library limits maxAttMtuSize to 251 (max HCI buffer size)
+        really_assert(attMtuSize >= BLE_DEFAULT_ATT_MTU && attMtuSize <= 251);
+        // BLE middleware supported attMtuSize = 512. Current usage of library limits attMtuSize to 251 (max HCI buffer size)
 
         BleStack_init_t bleStackInitParameters = {
             reinterpret_cast<uint8_t*>(bleBuffer.begin()),
@@ -72,9 +72,9 @@ namespace hal
             numAttrServ,
             attrValueArrSize,
             maxNumberOfBleLinks,
-            PrepareWriteListSize(maxAttMtuSize),
+            PrepareWriteListSize(attMtuSize),
             mblockCount,
-            maxAttMtuSize,
+            attMtuSize,
             248,
             64,
             maxNumberOfConnectionOrientedChannels,
diff --git a/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.hpp b/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.hpp
index b6692244..8a280b7d 100644
--- a/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.hpp
+++ b/hal_st/middlewares/ble_middleware/SystemTransportLayerWba.hpp
@@ -11,7 +11,7 @@ namespace hal
         , public HciEventSource
     {
     public:
-        explicit SystemTransportLayerWba(uint16_t maxAttMtuSize);
+        explicit SystemTransportLayerWba(uint16_t attMtuSize);
 
         // Implementation of HciEventSource
         void HciEventHandler(hci_event_pckt& event) override;
diff --git a/hal_st/middlewares/ble_middleware/TracingGattClientSt.cpp b/hal_st/middlewares/ble_middleware/TracingGattClientSt.cpp
index 8cf6a1ae..d20fa971 100644
--- a/hal_st/middlewares/ble_middleware/TracingGattClientSt.cpp
+++ b/hal_st/middlewares/ble_middleware/TracingGattClientSt.cpp
@@ -69,6 +69,12 @@ namespace hal
         GattClientSt::DisableIndication(handle, onDone);
     }
 
+    void TracingGattClientSt::MtuExchange(const infra::Function<void(services::OperationStatus)>& onDone)
+    {
+        tracer.Trace() << "TracingGattClientSt::MtuExchange";
+        GattClientSt::MtuExchange(onDone);
+    }
+
     void TracingGattClientSt::HandleGattIndicationEvent(const aci_gatt_indication_event_rp0& event)
     {
         infra::ConstByteRange data(&event.Attribute_Value[0], &event.Attribute_Value[0] + event.Attribute_Value_Length);
diff --git a/hal_st/middlewares/ble_middleware/TracingGattClientSt.hpp b/hal_st/middlewares/ble_middleware/TracingGattClientSt.hpp
index 53cea2b3..6a341a0e 100644
--- a/hal_st/middlewares/ble_middleware/TracingGattClientSt.hpp
+++ b/hal_st/middlewares/ble_middleware/TracingGattClientSt.hpp
@@ -23,6 +23,7 @@ namespace hal
         void DisableNotification(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone) override;
         void EnableIndication(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone) override;
         void DisableIndication(services::AttAttribute::Handle handle, const infra::Function<void(services::OperationStatus)>& onDone) override;
+        void MtuExchange(const infra::Function<void(services::OperationStatus)>& onDone) override;
 
     protected:
         void HandleGattIndicationEvent(const aci_gatt_indication_event_rp0& event) override;