Re: [Paparazzi-devel] confused between telemetry and datalink

[Pascal Brisset]

Hi,

- "telemetry" messages are used from the vehicle to the ground control 
station
- "datalink" messages are used from the gcs to the vehicle
- "ground" messages are used only over the ivy bus, between the "server" 
agent and the "interface" agents (e.g. agent)

--Pascal

Zouhair Mahboubi wrote:
> Small question:
> How is dl_parse_message supposed to differentiate between messages 
> received from the ground station as part of the datalink (uplink) and 
> those that maybe received from other airborne ACs (telemetry)
>
> It seems like the messages.xml uses the same message ID for messages 
> in both telemetry and datalink. (per example GPS and PING have the 
> same id)
> For the life of me I can't see how the autopilot code differentiates 
> between the two since as long as  DOWNLINK defined, the dl_parse_msg 
> is called if a valid message is received.
>
> The reason of the confusion is that I am trying to parse a telemetry 
> message sent by one AC on the other. I've managed to do this by 
> defining some custom message in both telemetry and datalink, but when 
> I tried with the GPS message it complained about Exception: Failure 
> "Wrong alignment of field 'utm_east' in message 'GPS". (I changed the 
> message ID to avoid collision , but that wasn't it) It seems to want a 
> certain alignment for the fields, but I can't move the fields around 
> because the GCS expects the GPS message to be in that order...
>
> Any hints?
>
> Happy holidays,
> Zouhair
>
>
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel