diff --git a/dsdl/uavcan/protocol/file/215.GetInfo.uavcan b/dsdl/uavcan/protocol/file/215.GetInfo.uavcan
index d26d085ac0..f018a2a835 100644
--- a/dsdl/uavcan/protocol/file/215.GetInfo.uavcan
+++ b/dsdl/uavcan/protocol/file/215.GetInfo.uavcan
@@ -11,7 +11,6 @@ Path path
 
 ---
 
-uint64 crc64     # Undefined for directories
-uint32 size      # Undefined for directories
+uint40 size      # Undefined for directories
 Error error
 EntryType entry_type
diff --git a/dsdl/uavcan/protocol/file/218.Read.uavcan b/dsdl/uavcan/protocol/file/218.Read.uavcan
index b120a86301..ebc1c6d4a1 100644
--- a/dsdl/uavcan/protocol/file/218.Read.uavcan
+++ b/dsdl/uavcan/protocol/file/218.Read.uavcan
@@ -12,7 +12,7 @@
 # will be returned, and data array will be empty.
 #
 
-uint32 offset
+uint40 offset
 Path path
 
 ---
diff --git a/dsdl/uavcan/protocol/file/219.Write.uavcan b/dsdl/uavcan/protocol/file/219.Write.uavcan
index 1cbec0666d..a661803863 100644
--- a/dsdl/uavcan/protocol/file/219.Write.uavcan
+++ b/dsdl/uavcan/protocol/file/219.Write.uavcan
@@ -15,9 +15,9 @@
 # example by means of creating a staging area for uncompleted writes (like FTP servers do).
 #
 
-uint32 offset
+uint40 offset
 Path path
-uint8[<=200] data
+uint8[<=192] data
 
 ---
 
diff --git a/libuavcan/include/uavcan/node/generic_publisher.hpp b/libuavcan/include/uavcan/node/generic_publisher.hpp
index 7dde549c00..7991cc5044 100644
--- a/libuavcan/include/uavcan/node/generic_publisher.hpp
+++ b/libuavcan/include/uavcan/node/generic_publisher.hpp
@@ -9,7 +9,6 @@
 #include <uavcan/node/abstract_node.hpp>
 #include <uavcan/data_type.hpp>
 #include <uavcan/node/global_data_type_registry.hpp>
-#include <uavcan/util/lazy_constructor.hpp>
 #include <uavcan/debug.hpp>
 #include <uavcan/transport/transfer_sender.hpp>
 #include <uavcan/marshal/scalar_codec.hpp>
@@ -20,15 +19,14 @@ namespace uavcan
 
 class GenericPublisherBase : Noncopyable
 {
-    const MonotonicDuration max_transfer_interval_;   // TODO: memory usage can be reduced
+    TransferSender sender_;
     MonotonicDuration tx_timeout_;
     INode& node_;
-    LazyConstructor<TransferSender> sender_;
 
 protected:
     GenericPublisherBase(INode& node, MonotonicDuration tx_timeout,
                          MonotonicDuration max_transfer_interval)
-        : max_transfer_interval_(max_transfer_interval)
+        : sender_(node.getDispatcher(), max_transfer_interval)
         , tx_timeout_(tx_timeout)
         , node_(node)
     {
@@ -51,7 +49,8 @@ protected:
     int genericPublish(const IMarshalBuffer& buffer, TransferType transfer_type, NodeID dst_node_id,
                        TransferID* tid, MonotonicTime blocking_deadline);
 
-    TransferSender* getTransferSender();
+    TransferSender& getTransferSender() { return sender_; }
+    const TransferSender& getTransferSender() const { return sender_; }
 
 public:
     static MonotonicDuration getMinTxTimeout() { return MonotonicDuration::fromUSec(200); }
@@ -66,7 +65,7 @@ public:
      */
     void allowAnonymousTransfers()
     {
-        sender_->allowAnonymousTransfers();
+        sender_.allowAnonymousTransfers();
     }
 
     INode& getNode() const { return node_; }
@@ -124,12 +123,6 @@ public:
     {
         return genericPublish(message, transfer_type, dst_node_id, &tid, blocking_deadline);
     }
-
-    TransferSender* getTransferSender()
-    {
-        (void)checkInit();
-        return GenericPublisherBase::getTransferSender();
-    }
 };
 
 // ----------------------------------------------------------------------------
diff --git a/libuavcan/include/uavcan/node/generic_subscriber.hpp b/libuavcan/include/uavcan/node/generic_subscriber.hpp
index 235f5518df..bb203788c6 100644
--- a/libuavcan/include/uavcan/node/generic_subscriber.hpp
+++ b/libuavcan/include/uavcan/node/generic_subscriber.hpp
@@ -33,26 +33,27 @@ namespace uavcan
 template <typename DataType_>
 class UAVCAN_EXPORT ReceivedDataStructure : public DataType_
 {
-    const IncomingTransfer* _transfer_;   ///< Such weird name is necessary to avoid clashing with DataType fields
+    const IncomingTransfer* const _transfer_;   ///< Such weird name is necessary to avoid clashing with DataType fields
 
     template <typename Ret, Ret(IncomingTransfer::*Fun) () const>
     Ret safeget() const
     {
         if (_transfer_ == NULL)
         {
-            UAVCAN_ASSERT(0);
             return Ret();
         }
         return (_transfer_->*Fun)();
     }
 
 protected:
-    ReceivedDataStructure() : _transfer_(NULL) { }
+    ReceivedDataStructure()
+        : _transfer_(NULL)
+    { }
 
-    void setTransfer(const IncomingTransfer* arg_transfer)
+    ReceivedDataStructure(const IncomingTransfer* arg_transfer)
+        : _transfer_(arg_transfer)
     {
         UAVCAN_ASSERT(arg_transfer != NULL);
-        _transfer_ = arg_transfer;
     }
 
 public:
@@ -139,7 +140,10 @@ public:
     typedef TransferListenerTemplate<BufferSize, NumStaticBufs, NumStaticReceivers> Type;
 };
 
-
+/**
+ * Please note that the reference passed to the RX callback points to a stack-allocated object, which means
+ * that it gets invalidated shortly after the callback returns.
+ */
 template <typename DataSpec, typename DataStruct, typename TransferListenerType>
 class UAVCAN_EXPORT GenericSubscriber : public GenericSubscriberBase
 {
@@ -162,23 +166,24 @@ class UAVCAN_EXPORT GenericSubscriber : public GenericSubscriberBase
         { }
     };
 
-    struct ReceivedDataStructureSpec : public ReceivedDataStructure<DataStruct>
-    {
-        using ReceivedDataStructure<DataStruct>::setTransfer;
-    };
-
     LazyConstructor<TransferForwarder> forwarder_;
-    ReceivedDataStructureSpec message_;
 
     int checkInit();
 
-    bool decodeTransfer(IncomingTransfer& transfer);
-
     void handleIncomingTransfer(IncomingTransfer& transfer);
 
     int genericStart(bool (Dispatcher::*registration_method)(TransferListenerBase*));
 
 protected:
+    struct ReceivedDataStructureSpec : public ReceivedDataStructure<DataStruct>
+    {
+        ReceivedDataStructureSpec() { }
+
+        ReceivedDataStructureSpec(const IncomingTransfer* arg_transfer)
+            : ReceivedDataStructure<DataStruct>(arg_transfer)
+        { }
+    };
+
     explicit GenericSubscriber(INode& node)
         : GenericSubscriberBase(node)
     { }
@@ -227,15 +232,6 @@ protected:
     }
 
     TransferListenerType* getTransferListener() { return forwarder_; }
-
-    /**
-     * Returns a reference to the temporary storage for decoded received messages.
-     * Reference to this storage is used as a parameter for subscription callbacks.
-     * This storage is guaranteed to stay intact after the last message was decoded, i.e.
-     * the application can use it to access the last received message object.
-     */
-    ReceivedDataStructure<DataStruct>& getReceivedStructStorage()             { return message_; }
-    const ReceivedDataStructure<DataStruct>& getReceivedStructStorage() const { return message_; }
 };
 
 // ----------------------------------------------------------------------------
@@ -250,48 +246,51 @@ int GenericSubscriber<DataSpec, DataStruct, TransferListenerType>::checkInit()
     {
         return 0;
     }
+
     GlobalDataTypeRegistry::instance().freeze();
     const DataTypeDescriptor* const descr =
         GlobalDataTypeRegistry::instance().find(DataTypeKind(DataSpec::DataTypeKind), DataSpec::getDataTypeFullName());
-    if (!descr)
+    if (descr == NULL)
     {
         UAVCAN_TRACE("GenericSubscriber", "Type [%s] is not registered", DataSpec::getDataTypeFullName());
         return -ErrUnknownDataType;
     }
+
     forwarder_.template construct<SelfType&, const DataTypeDescriptor&, IPoolAllocator&>
         (*this, *descr, node_.getAllocator());
+
     return 0;
 }
 
 template <typename DataSpec, typename DataStruct, typename TransferListenerType>
-bool GenericSubscriber<DataSpec, DataStruct, TransferListenerType>::decodeTransfer(IncomingTransfer& transfer)
+void GenericSubscriber<DataSpec, DataStruct, TransferListenerType>::handleIncomingTransfer(IncomingTransfer& transfer)
 {
+    ReceivedDataStructureSpec rx_struct(&transfer);
+
+    /*
+     * Decoding into the temporary storage
+     */
     BitStream bitstream(transfer);
     ScalarCodec codec(bitstream);
 
-    message_.setTransfer(&transfer);
+    const int decode_res = DataStruct::decode(rx_struct, codec);
 
-    const int decode_res = DataStruct::decode(message_, codec);
     // We don't need the data anymore, the memory can be reused from the callback:
     transfer.release();
+
     if (decode_res <= 0)
     {
         UAVCAN_TRACE("GenericSubscriber", "Unable to decode the message [%i] [%s]",
                      decode_res, DataSpec::getDataTypeFullName());
         failure_count_++;
         node_.getDispatcher().getTransferPerfCounter().addError();
-        return false;
+        return;
     }
-    return true;
-}
 
-template <typename DataSpec, typename DataStruct, typename TransferListenerType>
-void GenericSubscriber<DataSpec, DataStruct, TransferListenerType>::handleIncomingTransfer(IncomingTransfer& transfer)
-{
-    if (decodeTransfer(transfer))
-    {
-        handleReceivedDataStruct(message_);
-    }
+    /*
+     * Invoking the callback
+     */
+    handleReceivedDataStruct(rx_struct);
 }
 
 template <typename DataSpec, typename DataStruct, typename TransferListenerType>
diff --git a/libuavcan/include/uavcan/node/marshal_buffer.hpp b/libuavcan/include/uavcan/node/marshal_buffer.hpp
index 35a7e0885a..353233bc33 100644
--- a/libuavcan/include/uavcan/node/marshal_buffer.hpp
+++ b/libuavcan/include/uavcan/node/marshal_buffer.hpp
@@ -18,7 +18,7 @@ class UAVCAN_EXPORT IMarshalBuffer : public ITransferBuffer
 {
 public:
     virtual const uint8_t* getDataPtr() const = 0;
-    virtual unsigned getDataLength() const = 0;
+    virtual unsigned getMaxWritePos() const = 0;
 };
 
 /**
@@ -43,10 +43,8 @@ public:
 
 /**
  * Default implementation of marshal buffer provider.
- * This implementation provides the buffer large enough to
- * serialize any UAVCAN data structure.
  */
-template <unsigned MaxSize_ = MaxPossibleTransferPayloadLen>
+template <unsigned MaxSize_>
 class UAVCAN_EXPORT MarshalBufferProvider : public IMarshalBufferProvider
 {
     class Buffer : public IMarshalBuffer
@@ -65,7 +63,7 @@ class UAVCAN_EXPORT MarshalBufferProvider : public IMarshalBufferProvider
 
         virtual const uint8_t* getDataPtr() const { return buf_.getRawPtr(); }
 
-        virtual unsigned getDataLength() const { return buf_.getMaxWritePos(); }
+        virtual unsigned getMaxWritePos() const { return buf_.getMaxWritePos(); }
 
     public:
         void reset() { buf_.reset(); }
diff --git a/libuavcan/include/uavcan/node/node.hpp b/libuavcan/include/uavcan/node/node.hpp
index 0197241f62..9cc2773c5c 100644
--- a/libuavcan/include/uavcan/node/node.hpp
+++ b/libuavcan/include/uavcan/node/node.hpp
@@ -47,20 +47,20 @@ namespace uavcan
  *                                                  be allocated in the memory pool if needed.
  *                                                  Default value is acceptable for any use case.
  *
- * @tparam OutgoingTransferMaxPayloadLen    Maximum outgoing transfer payload length.
- *                                          It's pointless to make this value larger than
- *                                          @ref MaxTransferPayloadLen, which is default.
- *                                          Note that in tiny mode the default value is actually
- *                                          smaller than @ref MaxTransferPayloadLen (may cause
- *                                          run-time failures).
+ * @tparam MarshalBufferSize    Size of the marshal buffer that is used to provide short-term temporary storage for
+ *                              serialized data for TX transfers. The buffer must be large enough to accommodate
+ *                              largest serialized TX transfer. The default value is guaranteed to be large enough,
+ *                              but it can be reduced if long TX transfers are not used to optimize memory use.
+ *                              If UAVCAN_TINY mode is enabled, this value defaults to the maximum length of a
+ *                              response transfer of uavcan.protocol.GetNodeInfo.
  */
 template <std::size_t MemPoolSize_,
 #if UAVCAN_TINY
           unsigned OutgoingTransferRegistryStaticEntries = 0,
-          unsigned OutgoingTransferMaxPayloadLen = 264
+          unsigned MarshalBufferSize = BitLenToByteLen<protocol::GetNodeInfo::Response::MaxBitLen>::Result
 #else
           unsigned OutgoingTransferRegistryStaticEntries = 10,
-          unsigned OutgoingTransferMaxPayloadLen = MaxPossibleTransferPayloadLen
+          unsigned MarshalBufferSize = MaxPossibleTransferPayloadLen
 #endif
           >
 class UAVCAN_EXPORT Node : public INode
@@ -73,7 +73,7 @@ class UAVCAN_EXPORT Node : public INode
     typedef PoolAllocator<MemPoolSize, MemPoolBlockSize> Allocator;
 
     Allocator pool_allocator_;
-    MarshalBufferProvider<OutgoingTransferMaxPayloadLen> marsh_buf_;
+    MarshalBufferProvider<MarshalBufferSize> marsh_buf_;
     OutgoingTransferRegistry<OutgoingTransferRegistryStaticEntries> outgoing_trans_reg_;
     Scheduler scheduler_;
 
@@ -265,9 +265,8 @@ public:
 
 // ----------------------------------------------------------------------------
 
-template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries,
-          unsigned OutgoingTransferMaxPayloadLen>
-int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, OutgoingTransferMaxPayloadLen>::start(
+template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries, unsigned MarshalBufferSize>
+int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, MarshalBufferSize>::start(
     const TransferPriority priority)
 {
     if (started_)
@@ -313,9 +312,8 @@ fail:
 
 #if !UAVCAN_TINY
 
-template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries,
-          unsigned OutgoingTransferMaxPayloadLen>
-int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, OutgoingTransferMaxPayloadLen>::
+template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries, unsigned MarshalBufferSize>
+int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, MarshalBufferSize>::
 checkNetworkCompatibility(NetworkCompatibilityCheckResult& result)
 {
     if (!started_)
diff --git a/libuavcan/include/uavcan/node/publisher.hpp b/libuavcan/include/uavcan/node/publisher.hpp
index 4b95313d24..2b9222d1b5 100644
--- a/libuavcan/include/uavcan/node/publisher.hpp
+++ b/libuavcan/include/uavcan/node/publisher.hpp
@@ -81,46 +81,20 @@ public:
 
     /**
      * Returns priority of outgoing transfers.
-     * TODO: Make const.
      */
-    TransferPriority getPriority()
+    TransferPriority getPriority() const
     {
-        // TODO probably TransferSender must be transformed into regular field?
-        TransferSender* const ts = getTransferSender();
-        if (ts != NULL)
-        {
-            return ts->getPriority();
-        }
-        else
-        {
-            return TransferPriorityNormal;  // This is default
-        }
+        return BaseType::getTransferSender().getPriority();
     }
 
     /**
      * Allows to change the priority of outgoing transfers.
      * Note that only High, Normal and Low priorities can be used; Service priority is not available for messages.
-     * Returns negative error code if priority cannot be set, non-negative on success.
+     * If the priority value is invalid, an assertion failure will be generated, and the value will not be updated.
      */
-    int setPriority(const TransferPriority prio)
+    void setPriority(const TransferPriority prio)
     {
-        if (prio < NumTransferPriorities && prio != TransferPriorityService)
-        {
-            TransferSender* const ts = getTransferSender();  // TODO: Static TransferSender?
-            if (ts != NULL)
-            {
-                ts->setPriority(prio);
-                return 0;
-            }
-            else
-            {
-                return -ErrLogic;
-            }
-        }
-        else
-        {
-            return -ErrInvalidParam;
-        }
+        BaseType::getTransferSender().setPriority(prio);
     }
 
     static MonotonicDuration getDefaultTxTimeout() { return MonotonicDuration::fromMSec(10); }
diff --git a/libuavcan/include/uavcan/node/service_client.hpp b/libuavcan/include/uavcan/node/service_client.hpp
index b8467c4694..97d0a55fb3 100644
--- a/libuavcan/include/uavcan/node/service_client.hpp
+++ b/libuavcan/include/uavcan/node/service_client.hpp
@@ -59,9 +59,10 @@ struct ServiceCallID
 /**
  * Object of this type will be returned to the application as a result of service call.
  * Note that application ALWAYS gets this result, even when it times out or fails because of some other reason.
+ * The class is made noncopyable because it keeps a reference to a stack-allocated object.
  */
 template <typename DataType>
-class UAVCAN_EXPORT ServiceCallResult
+class UAVCAN_EXPORT ServiceCallResult : Noncopyable
 {
 public:
     typedef ReceivedDataStructure<typename DataType::Response> ResponseFieldType;
@@ -92,6 +93,9 @@ public:
 
     ServiceCallID getCallID() const { return call_id_; }
 
+    /**
+     * Returned reference points to a stack-allocated object.
+     */
     const ResponseFieldType& getResponse() const { return response_; }
     ResponseFieldType& getResponse() { return response_; }
 };
@@ -200,6 +204,10 @@ public:
  * This class can manage multiple concurrent calls to the same or different remote servers. Number of concurrent
  * calls is limited only by amount of available pool memory.
  *
+ * Note that the reference passed to the callback points to a stack-allocated object, which means that the
+ * reference invalidates once the callback returns. If you want to use this object after the callback execution,
+ * you need to copy it somewhere.
+ *
  * @tparam DataType_        Service data type.
  *
  * @tparam Callback_        Service response will be delivered through the callback of this type.
@@ -257,8 +265,12 @@ private:
                 UAVCAN_TRACE("ServiceClient::TimeoutCallbackCaller", "Timeout from nid=%d, tid=%d, dtname=%s",
                              int(state.getCallID().server_node_id.get()), int(state.getCallID().transfer_id.get()),
                              DataType::getDataTypeFullName());
+
+                typename SubscriberType::ReceivedDataStructureSpec rx_struct; // Default-initialized
+
                 ServiceCallResultType result(ServiceCallResultType::ErrorTimeout, state.getCallID(),
-                                             owner.getReceivedStructStorage());    // Mutable!
+                                             rx_struct);    // Mutable!
+
                 owner.invokeCallback(result);
             }
         }
diff --git a/libuavcan/include/uavcan/node/service_server.hpp b/libuavcan/include/uavcan/node/service_server.hpp
index 1602e6b70f..17076b4c5a 100644
--- a/libuavcan/include/uavcan/node/service_server.hpp
+++ b/libuavcan/include/uavcan/node/service_server.hpp
@@ -64,6 +64,9 @@ public:
 /**
  * Use this class to implement UAVCAN service servers.
  *
+ * Note that the references passed to the callback may point to stack-allocated objects, which means that the
+ * references get invalidated once the callback returns.
+ *
  * @tparam DataType_        Service data type.
  *
  * @tparam Callback_        Service calls will be delivered through the callback of this type, and service
@@ -117,26 +120,26 @@ private:
     PublisherType publisher_;
     Callback callback_;
     uint32_t response_failure_count_;
-    ServiceResponseDataStructure<ResponseType> response_;
 
     virtual void handleReceivedDataStruct(ReceivedDataStructure<RequestType>& request)
     {
         UAVCAN_ASSERT(request.getTransferType() == TransferTypeServiceRequest);
+
+        ServiceResponseDataStructure<ResponseType> response;
+
         if (try_implicit_cast<bool>(callback_, true))
         {
-            // The application needs newly initialized structure
-            response_ = ServiceResponseDataStructure<ResponseType>();
-            UAVCAN_ASSERT(response_.isResponseEnabled());  // Enabled by default
-            callback_(request, response_);
+            UAVCAN_ASSERT(response.isResponseEnabled());  // Enabled by default
+            callback_(request, response);
         }
         else
         {
             handleFatalError("Srv serv clbk");
         }
 
-        if (response_.isResponseEnabled())
+        if (response.isResponseEnabled())
         {
-            const int res = publisher_.publish(response_, TransferTypeServiceResponse, request.getSrcNodeID(),
+            const int res = publisher_.publish(response, TransferTypeServiceResponse, request.getSrcNodeID(),
                                                request.getTransferID());
             if (res < 0)
             {
diff --git a/libuavcan/include/uavcan/protocol/file_server.hpp b/libuavcan/include/uavcan/protocol/file_server.hpp
index 1e5fed04a2..f1ca877cd8 100644
--- a/libuavcan/include/uavcan/protocol/file_server.hpp
+++ b/libuavcan/include/uavcan/protocol/file_server.hpp
@@ -30,11 +30,6 @@ public:
     typedef protocol::file::EntryType EntryType;
     typedef protocol::file::Error Error;
 
-    /**
-     * Use this class to compute CRC64 for uavcan.protocol.file.GetInfo.
-     */
-    typedef DataTypeSignatureCRC FileCRC;
-
     /**
      * All read operations must return this number of bytes, unless end of file is reached.
      */
@@ -51,7 +46,7 @@ public:
      * Implementation of this method is required.
      * On success the method must return zero.
      */
-    virtual int16_t getInfo(const Path& path, uint64_t& out_crc64, uint32_t& out_size, EntryType& out_type) = 0;
+    virtual int16_t getInfo(const Path& path, uint64_t& out_size, EntryType& out_type) = 0;
 
     /**
      * Backend for uavcan.protocol.file.Read.
@@ -60,7 +55,7 @@ public:
      * if the end of file is reached.
      * On success the method must return zero.
      */
-    virtual int16_t read(const Path& path, const uint32_t offset, uint8_t* out_buffer, uint16_t& inout_size) = 0;
+    virtual int16_t read(const Path& path, const uint64_t offset, uint8_t* out_buffer, uint16_t& inout_size) = 0;
 
     // Methods below are optional.
 
@@ -69,7 +64,7 @@ public:
      * Implementation of this method is NOT required; by default it returns uavcan.protocol.file.Error.NOT_IMPLEMENTED.
      * On success the method must return zero.
      */
-    virtual int16_t write(const Path& path, const uint32_t offset, const uint8_t* buffer, const uint16_t size)
+    virtual int16_t write(const Path& path, const uint64_t offset, const uint8_t* buffer, const uint16_t size)
     {
         (void)path;
         (void)offset;
@@ -129,7 +124,7 @@ class BasicFileServer
 
     void handleGetInfo(const protocol::file::GetInfo::Request& req, protocol::file::GetInfo::Response& resp)
     {
-        resp.error.value = backend_.getInfo(req.path.path, resp.crc64, resp.size, resp.entry_type);
+        resp.error.value = backend_.getInfo(req.path.path, resp.size, resp.entry_type);
     }
 
     void handleRead(const protocol::file::Read::Request& req, protocol::file::Read::Response& resp)
diff --git a/libuavcan/include/uavcan/protocol/global_time_sync_master.hpp b/libuavcan/include/uavcan/protocol/global_time_sync_master.hpp
index 4b69451a0a..4cab0c4abf 100644
--- a/libuavcan/include/uavcan/protocol/global_time_sync_master.hpp
+++ b/libuavcan/include/uavcan/protocol/global_time_sync_master.hpp
@@ -51,16 +51,9 @@ class UAVCAN_EXPORT GlobalTimeSyncMaster : protected LoopbackFrameListenerBase
             const int res = pub_.init();
             if (res >= 0)
             {
-                TransferSender* const ts = pub_.getTransferSender();
-                UAVCAN_ASSERT(ts != NULL);
-                ts->setIfaceMask(uint8_t(1 << iface_index_));
-                ts->setCanIOFlags(CanIOFlagLoopback);
-
-                const int prio_res = pub_.setPriority(TransferPriorityHigh);  // Fixed priority
-                if (prio_res < 0)
-                {
-                    return prio_res;
-                }
+                pub_.getTransferSender().setIfaceMask(uint8_t(1 << iface_index_));
+                pub_.getTransferSender().setCanIOFlags(CanIOFlagLoopback);
+                pub_.setPriority(TransferPriorityHigh);  // Fixed priority
             }
             return res;
         }
@@ -84,8 +77,8 @@ class UAVCAN_EXPORT GlobalTimeSyncMaster : protected LoopbackFrameListenerBase
 
         int publish(TransferID tid, MonotonicTime current_time)
         {
-            UAVCAN_ASSERT(pub_.getTransferSender()->getCanIOFlags() == CanIOFlagLoopback);
-            UAVCAN_ASSERT(pub_.getTransferSender()->getIfaceMask() == (1 << iface_index_));
+            UAVCAN_ASSERT(pub_.getTransferSender().getCanIOFlags() == CanIOFlagLoopback);
+            UAVCAN_ASSERT(pub_.getTransferSender().getIfaceMask() == (1 << iface_index_));
 
             const MonotonicDuration since_prev_pub = current_time - iface_prev_pub_mono_;
             iface_prev_pub_mono_ = current_time;
diff --git a/libuavcan/include/uavcan/protocol/logger.hpp b/libuavcan/include/uavcan/protocol/logger.hpp
index 5856e07355..e6e3358152 100644
--- a/libuavcan/include/uavcan/protocol/logger.hpp
+++ b/libuavcan/include/uavcan/protocol/logger.hpp
@@ -101,7 +101,8 @@ public:
         {
             return res;
         }
-        return logmsg_pub_.setPriority(TransferPriorityLow); // Fixed priority
+        logmsg_pub_.setPriority(TransferPriorityLow); // Fixed priority
+        return 0;
     }
 
     /**
diff --git a/libuavcan/include/uavcan/transport/transfer_sender.hpp b/libuavcan/include/uavcan/transport/transfer_sender.hpp
index 26d6e0e628..2b95c20b42 100644
--- a/libuavcan/include/uavcan/transport/transfer_sender.hpp
+++ b/libuavcan/include/uavcan/transport/transfer_sender.hpp
@@ -20,16 +20,17 @@ namespace uavcan
 class UAVCAN_EXPORT TransferSender
 {
     const MonotonicDuration max_transfer_interval_;
-    const DataTypeDescriptor& data_type_;
+
+    Dispatcher& dispatcher_;
+
     TransferPriority priority_;
-    const CanTxQueue::Qos qos_;
-    const TransferCRC crc_base_;
+    CanTxQueue::Qos qos_;
+    TransferCRC crc_base_;
+    DataTypeID data_type_id_;
     CanIOFlags flags_;
     uint8_t iface_mask_;
     bool allow_anonymous_transfers_;
 
-    Dispatcher& dispatcher_;
-
     void registerError() const;
 
 public:
@@ -43,16 +44,30 @@ public:
     TransferSender(Dispatcher& dispatcher, const DataTypeDescriptor& data_type, CanTxQueue::Qos qos,
                    MonotonicDuration max_transfer_interval = getDefaultMaxTransferInterval())
         : max_transfer_interval_(max_transfer_interval)
-        , data_type_(data_type)
+        , dispatcher_(dispatcher)
         , priority_(TransferPriorityNormal)
-        , qos_(qos)
-        , crc_base_(data_type.getSignature().toTransferCRC())
+        , qos_(CanTxQueue::Qos())
         , flags_(CanIOFlags(0))
         , iface_mask_(AllIfacesMask)
         , allow_anonymous_transfers_(false)
+    {
+        init(data_type, qos);
+    }
+
+    TransferSender(Dispatcher& dispatcher, MonotonicDuration max_transfer_interval = getDefaultMaxTransferInterval())
+        : max_transfer_interval_(max_transfer_interval)
         , dispatcher_(dispatcher)
+        , priority_(TransferPriorityNormal)
+        , qos_(CanTxQueue::Qos())
+        , flags_(CanIOFlags(0))
+        , iface_mask_(AllIfacesMask)
+        , allow_anonymous_transfers_(false)
     { }
 
+    void init(const DataTypeDescriptor& dtid, CanTxQueue::Qos qos);
+
+    bool isInitialized() const { return data_type_id_ != DataTypeID(); }
+
     CanIOFlags getCanIOFlags() const { return flags_; }
     void setCanIOFlags(CanIOFlags flags) { flags_ = flags; }
 
diff --git a/libuavcan/src/node/uc_generic_publisher.cpp b/libuavcan/src/node/uc_generic_publisher.cpp
index 3ebc7bd699..73ab834d96 100644
--- a/libuavcan/src/node/uc_generic_publisher.cpp
+++ b/libuavcan/src/node/uc_generic_publisher.cpp
@@ -9,7 +9,7 @@ namespace uavcan
 
 bool GenericPublisherBase::isInited() const
 {
-    return bool(sender_);
+    return sender_.isInitialized();
 }
 
 int GenericPublisherBase::doInit(DataTypeKind dtkind, const char* dtname, CanTxQueue::Qos qos)
@@ -22,13 +22,14 @@ int GenericPublisherBase::doInit(DataTypeKind dtkind, const char* dtname, CanTxQ
     GlobalDataTypeRegistry::instance().freeze();
 
     const DataTypeDescriptor* const descr = GlobalDataTypeRegistry::instance().find(dtkind, dtname);
-    if (!descr)
+    if (descr == NULL)
     {
         UAVCAN_TRACE("GenericPublisher", "Type [%s] is not registered", dtname);
         return -ErrUnknownDataType;
     }
-    sender_.construct<Dispatcher&, const DataTypeDescriptor&, CanTxQueue::Qos, MonotonicDuration>
-        (node_.getDispatcher(), *descr, qos, max_transfer_interval_);
+
+    sender_.init(*descr, qos);
+
     return 0;
 }
 
@@ -47,21 +48,16 @@ int GenericPublisherBase::genericPublish(const IMarshalBuffer& buffer, TransferT
 {
     if (tid)
     {
-        return sender_->send(buffer.getDataPtr(), buffer.getDataLength(), getTxDeadline(),
-                             blocking_deadline, transfer_type, dst_node_id, *tid);
+        return sender_.send(buffer.getDataPtr(), buffer.getMaxWritePos(), getTxDeadline(),
+                            blocking_deadline, transfer_type, dst_node_id, *tid);
     }
     else
     {
-        return sender_->send(buffer.getDataPtr(), buffer.getDataLength(), getTxDeadline(),
-                             blocking_deadline, transfer_type, dst_node_id);
+        return sender_.send(buffer.getDataPtr(), buffer.getMaxWritePos(), getTxDeadline(),
+                            blocking_deadline, transfer_type, dst_node_id);
     }
 }
 
-TransferSender* GenericPublisherBase::getTransferSender()
-{
-    return sender_.isConstructed() ? static_cast<TransferSender*>(sender_) : NULL;
-}
-
 void GenericPublisherBase::setTxTimeout(MonotonicDuration tx_timeout)
 {
     tx_timeout = max(tx_timeout, getMinTxTimeout());
diff --git a/libuavcan/src/protocol/uc_dynamic_node_id_client.cpp b/libuavcan/src/protocol/uc_dynamic_node_id_client.cpp
index f6150ed3ac..173314ed81 100644
--- a/libuavcan/src/protocol/uc_dynamic_node_id_client.cpp
+++ b/libuavcan/src/protocol/uc_dynamic_node_id_client.cpp
@@ -160,11 +160,7 @@ int DynamicNodeIDClient::start(const protocol::HardwareVersion& hardware_version
         return res;
     }
     dnida_pub_.allowAnonymousTransfers();
-    res = dnida_pub_.setPriority(transfer_priority);
-    if (res < 0)
-    {
-        return res;
-    }
+    dnida_pub_.setPriority(transfer_priority);
 
     res = dnida_sub_.start(AllocationCallback(this, &DynamicNodeIDClient::handleAllocation));
     if (res < 0)
diff --git a/libuavcan/src/protocol/uc_node_status_provider.cpp b/libuavcan/src/protocol/uc_node_status_provider.cpp
index bd090adb10..736050628f 100644
--- a/libuavcan/src/protocol/uc_node_status_provider.cpp
+++ b/libuavcan/src/protocol/uc_node_status_provider.cpp
@@ -71,11 +71,7 @@ int NodeStatusProvider::startAndPublish(TransferPriority priority)
 
     int res = -1;
 
-    res = node_status_pub_.setPriority(priority);
-    if (res < 0)
-    {
-        goto fail;
-    }
+    node_status_pub_.setPriority(priority);
 
     if (!getNode().isPassiveMode())
     {
diff --git a/libuavcan/src/transport/uc_transfer_sender.cpp b/libuavcan/src/transport/uc_transfer_sender.cpp
index 6f49f7a635..232ce82235 100644
--- a/libuavcan/src/transport/uc_transfer_sender.cpp
+++ b/libuavcan/src/transport/uc_transfer_sender.cpp
@@ -15,6 +15,15 @@ void TransferSender::registerError() const
     dispatcher_.getTransferPerfCounter().addError();
 }
 
+void TransferSender::init(const DataTypeDescriptor& dtid, CanTxQueue::Qos qos)
+{
+    UAVCAN_ASSERT(!isInitialized());
+
+    qos_          = qos;
+    data_type_id_ = dtid.getID();
+    crc_base_     = dtid.getSignature().toTransferCRC();
+}
+
 int TransferSender::send(const uint8_t* payload, unsigned payload_len, MonotonicTime tx_deadline,
                          MonotonicTime blocking_deadline, TransferType transfer_type, NodeID dst_node_id,
                          TransferID tid) const
@@ -24,7 +33,7 @@ int TransferSender::send(const uint8_t* payload, unsigned payload_len, Monotonic
         return -ErrTransferTooLong;
     }
 
-    Frame frame(data_type_.getID(), transfer_type, dispatcher_.getNodeID(), dst_node_id, 0, tid);
+    Frame frame(data_type_id_, transfer_type, dispatcher_.getNodeID(), dst_node_id, 0, tid);
     if (transfer_type == TransferTypeMessageBroadcast ||
         transfer_type == TransferTypeMessageUnicast)
     {
@@ -143,7 +152,7 @@ int TransferSender::send(const uint8_t* payload, unsigned payload_len, Monotonic
     /*
      * TODO: TID is not needed for anonymous transfers, this part of the code can be skipped?
      */
-    const OutgoingTransferRegistryKey otr_key(data_type_.getID(), transfer_type, dst_node_id);
+    const OutgoingTransferRegistryKey otr_key(data_type_id_, transfer_type, dst_node_id);
 
     UAVCAN_ASSERT(!tx_deadline.isZero());
     const MonotonicTime otr_deadline = tx_deadline + max_transfer_interval_;
@@ -151,8 +160,8 @@ int TransferSender::send(const uint8_t* payload, unsigned payload_len, Monotonic
     TransferID* const tid = dispatcher_.getOutgoingTransferRegistry().accessOrCreate(otr_key, otr_deadline);
     if (tid == NULL)
     {
-        UAVCAN_TRACE("TransferSender", "OTR access failure, dtd=%s tt=%i",
-                     data_type_.toString().c_str(), int(transfer_type));
+        UAVCAN_TRACE("TransferSender", "OTR access failure, dtid=%d tt=%i",
+                     int(data_type_id_.get()), int(transfer_type));
         return -ErrMemory;
     }
 
diff --git a/libuavcan/test/node/publisher.cpp b/libuavcan/test/node/publisher.cpp
index 61a57ea1c2..231a25b934 100644
--- a/libuavcan/test/node/publisher.cpp
+++ b/libuavcan/test/node/publisher.cpp
@@ -18,6 +18,8 @@ TEST(Publisher, Basic)
 
     uavcan::Publisher<uavcan::mavlink::Message> publisher(node);
 
+    ASSERT_FALSE(publisher.getTransferSender().isInitialized());
+
     std::cout <<
         "sizeof(uavcan::Publisher<uavcan::mavlink::Message>): " <<
         sizeof(uavcan::Publisher<uavcan::mavlink::Message>) << std::endl;
@@ -110,18 +112,5 @@ TEST(Publisher, Basic)
      * Misc
      */
     ASSERT_TRUE(uavcan::GlobalDataTypeRegistry::instance().isFrozen());
-    ASSERT_TRUE(publisher.getTransferSender());
-}
-
-
-TEST(Publisher, ImplicitInitialization)
-{
-    SystemClockMock clock_mock(100);
-    CanDriverMock can_driver(2, clock_mock);
-    TestNode node(can_driver, clock_mock, 1);
-
-    uavcan::Publisher<uavcan::mavlink::Message> publisher(node);
-
-    // Will be initialized ad-hoc
-    ASSERT_TRUE(publisher.getTransferSender());
+    ASSERT_TRUE(publisher.getTransferSender().isInitialized());
 }
diff --git a/libuavcan/test/node/service_client.cpp b/libuavcan/test/node/service_client.cpp
index 82d99a66ac..8306ea1c16 100644
--- a/libuavcan/test/node/service_client.cpp
+++ b/libuavcan/test/node/service_client.cpp
@@ -178,8 +178,7 @@ TEST(ServiceClient, Basic)
         ASSERT_EQ(0, nodes.b.getDispatcher().getNumServiceResponseListeners()); // Third has timed out :(
 
         // Validating
-        // We use expected response instead of empty response because the last valid will be reused on fauilure
-        ASSERT_TRUE(handler.match(ResultType::ErrorTimeout, 99, expected_response));
+        ASSERT_TRUE(handler.match(ResultType::ErrorTimeout, 99, root_ns_a::StringService::Response()));
 
         // Stray request
         ASSERT_LT(0, client3.call(99, request)); // Will timeout!
@@ -341,7 +340,7 @@ TEST(ServiceClient, ConcurrentCalls)
     ASSERT_EQ(1, client.getNumPendingCalls());                                  // One dropped
     ASSERT_EQ(1, nodes.b.getDispatcher().getNumServiceResponseListeners());     // Still listening
 
-    ASSERT_TRUE(handler.match(ResultType::ErrorTimeout, 88, last_response));
+    ASSERT_TRUE(handler.match(ResultType::ErrorTimeout, 88, root_ns_a::StringService::Response()));
 
     /*
      * Validating the 500 ms timeout
@@ -352,7 +351,7 @@ TEST(ServiceClient, ConcurrentCalls)
     ASSERT_EQ(0, client.getNumPendingCalls());                                  // All finished
     ASSERT_EQ(0, nodes.b.getDispatcher().getNumServiceResponseListeners());     // Not listening
 
-    ASSERT_TRUE(handler.match(ResultType::ErrorTimeout, 99, last_response));
+    ASSERT_TRUE(handler.match(ResultType::ErrorTimeout, 99, root_ns_a::StringService::Response()));
 }
 
 
diff --git a/libuavcan/test/node/test_node.hpp b/libuavcan/test/node/test_node.hpp
index 543f99a50d..5a943ae6da 100644
--- a/libuavcan/test/node/test_node.hpp
+++ b/libuavcan/test/node/test_node.hpp
@@ -20,7 +20,7 @@ struct TestNode : public uavcan::INode
 {
     uavcan::PoolAllocator<uavcan::MemPoolBlockSize * 100, uavcan::MemPoolBlockSize> pool;
     uavcan::PoolManager<1> poolmgr;
-    uavcan::MarshalBufferProvider<> buffer_provider;
+    uavcan::MarshalBufferProvider<512> buffer_provider;
     uavcan::OutgoingTransferRegistry<8> otr;
     uavcan::Scheduler scheduler;
     uint64_t internal_failure_count;
diff --git a/libuavcan/test/protocol/data_type_info_provider.cpp b/libuavcan/test/protocol/data_type_info_provider.cpp
index 1780d5f801..fc1bd40cc3 100644
--- a/libuavcan/test/protocol/data_type_info_provider.cpp
+++ b/libuavcan/test/protocol/data_type_info_provider.cpp
@@ -19,7 +19,8 @@ using uavcan::DefaultDataTypeRegistrator;
 using uavcan::MonotonicDuration;
 
 template <typename DataType>
-static bool validateDataTypeInfoResponse(const std::auto_ptr<ServiceCallResult<GetDataTypeInfo> >& resp, unsigned mask)
+static bool validateDataTypeInfoResponse(const std::auto_ptr<ServiceCallResultCollector<GetDataTypeInfo>::Result>& resp,
+                                         unsigned mask)
 {
     if (!resp.get())
     {
diff --git a/libuavcan/test/protocol/file_server.cpp b/libuavcan/test/protocol/file_server.cpp
index f3591e79e3..be970b4d04 100644
--- a/libuavcan/test/protocol/file_server.cpp
+++ b/libuavcan/test/protocol/file_server.cpp
@@ -13,15 +13,10 @@ public:
     static const std::string file_name;
     static const std::string file_data;
 
-    virtual int16_t getInfo(const Path& path, uint64_t& out_crc64, uint32_t& out_size, EntryType& out_type)
+    virtual int16_t getInfo(const Path& path, uint64_t& out_size, EntryType& out_type)
     {
         if (path == file_name)
         {
-            {
-                FileCRC crc;
-                crc.add(reinterpret_cast<const uavcan::uint8_t*>(file_data.c_str()), unsigned(file_data.length()));
-                out_crc64 = crc.get();
-            }
             out_size = uint16_t(file_data.length());
             out_type.flags |= EntryType::FLAG_FILE;
             out_type.flags |= EntryType::FLAG_READABLE;
@@ -33,7 +28,7 @@ public:
         }
     }
 
-    virtual int16_t read(const Path& path, const uint32_t offset, uint8_t* out_buffer, uint16_t& inout_size)
+    virtual int16_t read(const Path& path, const uint64_t offset, uint8_t* out_buffer, uint16_t& inout_size)
     {
         if (path == file_name)
         {
@@ -90,7 +85,6 @@ TEST(BasicFileServer, Basic)
         ASSERT_TRUE(get_info.collector.result.get());
         ASSERT_TRUE(get_info.collector.result->isSuccessful());
 
-        ASSERT_EQ(0x62EC59E3F1A4F00A, get_info.collector.result->getResponse().crc64);
         ASSERT_EQ(0, get_info.collector.result->getResponse().error.value);
         ASSERT_EQ(9, get_info.collector.result->getResponse().size);
         ASSERT_EQ(EntryType::FLAG_FILE | EntryType::FLAG_READABLE,
diff --git a/libuavcan/test/protocol/helpers.hpp b/libuavcan/test/protocol/helpers.hpp
index e0fb164f2f..3c2bc6c7ec 100644
--- a/libuavcan/test/protocol/helpers.hpp
+++ b/libuavcan/test/protocol/helpers.hpp
@@ -51,18 +51,47 @@ struct SubscriberWithCollector
 template <typename DataType>
 class ServiceCallResultCollector : uavcan::Noncopyable
 {
-    typedef uavcan::ServiceCallResult<DataType> ResultType;
+    typedef uavcan::ServiceCallResult<DataType> ServiceCallResult;
 
-    void handler(const ResultType& result)
+public:
+    class Result
     {
-        this->result.reset(new ResultType(result));
+        const typename ServiceCallResult::Status status_;
+        uavcan::ServiceCallID call_id_;
+        typename DataType::Response response_;
+
+    public:
+        Result(typename ServiceCallResult::Status arg_status,
+               uavcan::ServiceCallID arg_call_id,
+               const typename DataType::Response& arg_response)
+            : status_(arg_status)
+            , call_id_(arg_call_id)
+            , response_(arg_response)
+        { }
+
+        bool isSuccessful() const { return status_ == ServiceCallResult::Success; }
+
+        typename ServiceCallResult::Status getStatus() const { return status_; }
+
+        uavcan::ServiceCallID getCallID() const { return call_id_; }
+
+        const typename DataType::Response& getResponse() const { return response_; }
+        typename DataType::Response& getResponse() { return response_; }
+    };
+
+private:
+    void handler(const uavcan::ServiceCallResult<DataType>& tmp_result)
+    {
+        std::cout << tmp_result << std::endl;
+        result.reset(new Result(tmp_result.getStatus(), tmp_result.getCallID(), tmp_result.getResponse()));
     }
 
 public:
-    std::auto_ptr<ResultType> result;
+    std::auto_ptr<Result> result;
 
     typedef uavcan::MethodBinder<ServiceCallResultCollector*,
-                                 void (ServiceCallResultCollector::*)(const ResultType&)> Binder;
+                                 void (ServiceCallResultCollector::*)(const uavcan::ServiceCallResult<DataType>&)>
+            Binder;
 
     Binder bind() { return Binder(this, &ServiceCallResultCollector::handler); }
 };