mavlink:

- implement get_free_tx_buf() for UDP and TCP
- gefine get_uart_fd for all platforms

src/modules/mavlink/mavlink_main.cpp

@@ -435,7 +435,6 @@ Mavlink::forward_message(const mavlink_message_t *msg, Mavlink *self)
 	}
 }
 
-#ifndef __PX4_POSIX
 int
 Mavlink::get_uart_fd(unsigned index)
 {
@@ -453,7 +452,6 @@ Mavlink::get_uart_fd()
 {
 	return _uart_fd;
 }
-#endif // __PX4_POSIX
 
 int
 Mavlink::get_instance_id()
@@ -810,6 +808,11 @@ Mavlink::get_free_tx_buf()
 
 #endif
 
+	// if we are using network sockets, return max lenght of one packet
+	if (get_protocol() == UDP || get_protocol() == TCP ) {
+		return  1500;
+	}
+
 	return buf_free;
 }
 

src/modules/mavlink/mavlink_main.h

@@ -123,11 +123,9 @@ public:
 
 	static void		forward_message(const mavlink_message_t *msg, Mavlink *self);
 
-#ifndef __PX4_QURT
 	static int		get_uart_fd(unsigned index);
 
 	int			get_uart_fd();
-#endif
 
 	/**
 	 * Get the MAVLink system id.