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Re: [Paparazzi-devel] PPZ Communication Protocol


From: Gautier Hattenberger
Subject: Re: [Paparazzi-devel] PPZ Communication Protocol
Date: Mon, 30 Jan 2012 10:30:33 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.23) Gecko/20110922 Thunderbird/3.1.15

Hello,

What is your main goal by writing a new GCS ? The ground station is based on agents connected to a middleware (http://paparazzi.enac.fr/wiki/Ivy) (http://paparazzi.enac.fr/wiki/Overview). So if you just want to replace the graphical part by a another one, it is better and probably easier to only replace the "GCS" agent. Then you have the parsing of the binary messages, the logging and some other stuff for free. The messages between the GCS and the rest of the system are described here : http://paparazzi.enac.fr/wiki/DevGuide/Server_GCS_com

Gautier

On 28/01/2012 20:14, Charles Breingan wrote:
Hi all,

I am trying to write my own software ground station interface to the paparazzi and I am having trouble finding the messaging standard documented anywhere. I've looked in a bunch of places and I found the messages sets in the conf folder in default_fixedwing_imu.xml. This is a good start to figuring out the messages, but I still can't find documentation on start bytes, or checksums, or anything else that these messages might include. Does anybody know where to find this information? 

I have been watching the byte stream over my xbee and I think that I see a pattern. Do messages start with 0x99? That looks like a start byte to me, but I can't figure out what comes after that.

Any help would be greatly appreciated. Thanks.

Sincerely,

C. Randy Breingan

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