mavproxy_rc: write sitl_output to current link

Signed-off-by: Rhys Mainwaring <rhys.mainwaring@me.com>

Author: srmainwaring

MAVProxy/modules/mavproxy_rc.py

@@ -30,7 +30,7 @@ def __init__(self, mpstate):
         self.add_command('switch', self.cmd_switch, "flight mode switch control", ['<0|1|2|3|4|5|6>'])
         self.rc_settings = mp_settings.MPSettings(
             [('override_hz', float, 10.0)])
-        if self.sitl_output:
+        if self.sitl_outputs:
             self.rc_settings.override_hz = 20.0
         self.add_completion_function('(RCSETTING)',
                                      self.rc_settings.completion)
@@ -112,10 +112,10 @@ def mavlink_packet(self, m):
 
     def send_rc(self):
         '''send RC override packet'''
-        if self.sitl_output:
+        if self.sitl_outputs:
             chan16 = self.override[:16]
             buf = struct.pack('<HHHHHHHHHHHHHHHH', *chan16)
-            self.sitl_output.write(buf)
+            self.sitl_outputs[self.master.linknum].write(buf)
         else:
             chan18 = self.override[:18]
             self.master.mav.rc_channels_override_send(self.target_system,