Minor changes for YModemReceive with timers and signals

TimeoutSerial.h

@@ -101,7 +101,7 @@ public:
      * \param size array size
      * \throws boost::system::system_error if any error
      */
-    void write(const char *data, size_t size);
+    size_t write(const char *data, size_t size);
 
      /**
      * Write data
@@ -126,7 +126,7 @@ public:
      * \throws boost::system::system_error if any error
      * \throws timeout_exception in case of timeout
      */
-    void read(char *data, size_t size);
+    size_t read(char *data, size_t size);
 
     /**
      * Read some data, blocking
@@ -162,7 +162,7 @@ public:
      */
     std::string readStringUntil(const std::string& delim="\n");
     int readChar(int delay);
-
+    
     void setRTS(bool enabled);
     void setDTR(bool enabled);
     
@@ -227,6 +227,7 @@ private:
     boost::asio::io_service io; ///< Io service object
     boost::asio::serial_port port; ///< Serial port object
     boost::asio::deadline_timer timer; ///< Timer for timeout
+
     boost::posix_time::time_duration timeout; ///< Read/write timeout
     boost::asio::streambuf readData; ///< Holds eventual read but not consumed
     enum ReadResult result;  ///< Used by read with timeout