HAL_SITL: implement a dummy buffered write

libraries/AP_HAL_AVR_SITL/Console.cpp

@@ -59,5 +59,8 @@ size_t SITLConsoleDriver::write(uint8_t c)
         return _base_uart->write(c);
 }
 
+size_t SITLConsoleDriver::write(const uint8_t *buffer, size_t size) {
+    return _base_uart->write(buffer, size);
+}
 
 #endif

libraries/AP_HAL_AVR_SITL/Console.h

@@ -24,6 +24,7 @@ public:
 
     /* Implementations of Print virtual methods */
     size_t write(uint8_t c);
+    size_t write(const uint8_t *buffer, size_t size);
 
 private:
     AP_HAL::UARTDriver* _base_uart;

libraries/AP_HAL_AVR_SITL/UARTDriver.cpp

@@ -174,6 +174,15 @@ size_t SITLUARTDriver::write(uint8_t c)
     return send(_fd, &c, 1, flags);
 }
 
+size_t SITLUARTDriver::write(const uint8_t *buffer, size_t size)
+{
+    size_t n = 0;
+    while (size--) {
+        n += write(*buffer++);
+    }
+    return n;
+}
+
 /*
   start a TCP connection for the serial port. If wait_for_connection
   is true then block until a client connects

libraries/AP_HAL_AVR_SITL/UARTDriver.h

@@ -46,6 +46,7 @@ public:
 
     /* Implementations of Print virtual methods */
     size_t write(uint8_t c);
+    size_t write(const uint8_t *buffer, size_t size);
 
     // file descriptor, exposed so SITL_State::loop_hook() can use it
 	int _fd;