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DEV Support: Purpose of Message Deferment

Posted by Christian Lopez on March 20, 2013 at 5:12pm

All- I know this is a specific question, but if anyone can help, it will be much appreciated.

First, what happens to the APM/ArduPlane when a Tx serial buffer is over-filled?

Second, what does message deferment accomplish/ why is it necessary for standard telemetry?

Third, what is the danger of sending to a serial port without using checks for buffer size and/or some message deferment process? Could it cause the APM to re-set and re-initialize?

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Tags: arduplane266, gcs, mavlink, serial, telemetry, xbee
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  • Søren Kuula March 24, 2013 at 8:38am

    Hi,

    First, what happens to the APM/ArduPlane when a Tx serial buffer is over-filled?

    Then you will start sending corrupted messages, which are useless and wasteful.

    Second, what does message deferment accomplish/ why is it necessary for standard telemetry?

    With deferment, it will be remembered that a message was not sent. The job is queued for when there is enough buffer space to do it.

    Third, what is the danger of sending to a serial port without using checks for buffer size and/or some message deferment process? Could it cause the APM to re-set and re-initialize?

    It looks to me like it is safe against that. But will just send rubbish messages that are not useful if the buffer overflows.

    Regards

    Soren

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