[Tinyos-help] sendDone() called before receive

[Michael Schippling]

That depends if you have ACKs enabled.

W/o ACKs, sendDone() is called sometime after the last byte of the message
has been written into the transmitter input register.

W/ ACKs, sendDone() is delayed for a short period (rummage in the radio code
to see how long, but order of mag is 10ms). If an ACK is received the wait
breaks and the msg->ack field is set, otherwise not.

In either case it's a tossup as to synchronicity with a receiver at the
user level.

This is, of course, real-world talk, if it's a SIM run I have no idea...

MS


Thang Le wrote:
>   From my understanding, in TinyOS 1.1.15, SendDone is invoked when the 
> package is successfully queued at the sender. Even without any receiver, 
> SendDone is still called.
>  
> 
> */Bibudh Lahiri <bibudh at gmail.com>/* wrote:
> 
> 
>     Faisal,
>       I'm not sure, but my guess is sendDone() is invoked at the src
>     when the MAC-layer ACK is received by the sender. The MAC layer ACK
>     is always rcvd from the one-hop neighbor, because MAC is not
>     concerned about end-to-end message delivery. So in case of multi-hop
>     routing, it appears to u that sendDone() is called before the frame
>     is received at destination.
>                                                                                                                        
>     Bibudh
>      
>     On 4/1/07, *Faisal Karim* <shaikh_fk at yahoo.com
>     <mailto:shaikh_fk at yahoo.com>> wrote:
> 
>         Hi All
> 
>         Im using TinyOS 1.1.15, can anybody tell me why this behavior is
>         encountered for sendDone()
> 
>         When the source is in one hop from destination the packet is
>         received by destination first than sendDone is called at source.
>         But in case when source is more than one hop away sendDone is
>         called before it is received at destination, which is correct
>         operation. Can someone put light on this.
>          
>         Regards
>         Shaikh, Faisal Karim
> 
> 
>          
> 
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