Does Mavlink support retransmission ?

[Bryan]

Hi all,
    I use the MAVProxy and Mission Planner software. I want to know how they handle the mavlink packets if the packets are lost.
    But I trace the code. I found there are no function directly handle the problem of packets lost...
    Does anyone know why ?
    
Best,
Bryan.

[Vladimir Ermakov]

Hi,

Mavlink doesn't have retransmissions. For most telemetry data it is not needed (e.g. for what purpose you need past attitude?).
Where retry is needed it handled in higher protocol (e.g. waypoint or parameter protocols).

вторник, 27 января 2015 г., 9:08:54 UTC+3 пользователь Bryan написал:

[Bill Bonney]

Just to add, commands that need a confirmation have an associated ACK message. Retries are then added to the upper layer.

This keeps the protocol lightweight and easy to implement different strategies depending on link bandwidth and quality

Bill

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[murtaza bagwala]

Right, we only need retries for the crucial messages like (waypoint or parameter messages) because losing of those messages results in the incorrect flight plan.