output of MAVLINK "RC_CHANNELS_RAW" message format error

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- What steps will reproduce the problem?
1. Configure and enable a joystick to output "ardupilot mega" data.
2. Select the "serial data" tab. Optionally, connect the GCS to a virtual 
serial port and grab the data output from the GCS.
3. Move the joystick's controls and observe the data output in the serial 
monitor or serial port sniffer.

- What is the expected output? What do you see instead?
The expected output (as far as I understand) is a serial stream of a 
RC_CHANNELS_RAW mavlink message. This stream should be composed by a start sign 
(0x55), a Payload length (0x12), Packet sequence, System ID, Component ID 
(those 3 values are irrelevant at the moment), the comes the Message ID (that 
should be 0x23).
What it is in the real output is a Message ID of 0x46. But, curiously, in a 
previous release of this GCS this message was formatted well (with a message ID 
of 0x23).
Another fact is that in a previous release of GCS the message ID was correct, 
and the payload length was assigned a value of 0x11 (17 bytes), and in the 
current release this value has changed to 0x12 (18 bytes). I think the correct 
value should be 0x11 (17 bytes), as the payload for this message is composed by 
8 16bit-values plus 1 8bit-value.

- What version of the product are you using? On what operating system?
The problem is in version lite-1.3.16

- Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 15 Jul 2011 at 12:00