CODEWITHSUNDEEP
communicationtinyosnesc
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Reputation: 199

TinyOs nesc Packet acknowledge

I want to write a mote-mote radio communication program, and want the receiver acknowledges back to the sender. I know the PacketAcknowledgements is recommended, but there are some questions I'm not sure about this interface.

1. If I use it in the sender mote,should i also uses interface Receive in the module of the sender mote
2. Should I write extra code in the receiver mote? Should I use interface PacketAcknowledgements too?
3. command error_t requestAck(message_t *msg) and command bool wasAcked(message_t *msg) should be used when and where

Upvotes: 0

Views: 363

Answers (1)

maral
maral

Reputation: 1471

  1. No.
  2. No.
  3. You need to call requestAck on a packet you're about to send just before calling send from interface AMSend or Send. Be sure to check an error code returned by requestAck, because FAIL indicates that the communication layer doesn't support synchronous acknowledgements (it depends on the radio chip and driver you use). Once the packet is sent, i.e., inside event sendDone (or later), call wasAcked, which returns true if the packet was acknowledged by the receiver.

More info in: https://github.com/tinyos/tinyos-main/blob/master/tos/interfaces/PacketAcknowledgements.nc

Upvotes: 1

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