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  • Case ID: 121315
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Ant ACK retries

angel

Hi Nordic,

I am now trying to use ANT acknowledged data type in reverse direction (from slave to master), and I have some questions:

  • When sometimes, ack signal fails, internally, how many retries are configured? Can this number of retries be changed in the ANT stack, or I have to do it by software?

  • The ACK message, does it bring information about the whole message it is replying to? I mean, is there any difference between an ACK message received for message 1 and for message 2?

  • What is usually the time that it takes to receive the event TRANSFER_TX_FAILED? Can this time be configured? Does it depend on the channel period?

Thanks!

PS: S210 v5.0.0, nRF51422.

  • 0
    • This seems to be described in Section 9.5.5.2 in ANT Message Protocol and Usage 5.1, on Page 103:

    Acknowledged data messages can be sent from a slave to a master. In this case the message is sent immediately after a message is received from the master. If the acknowledged data message is sent successfully, this will be indicated by the channel event TRANSFER_TX_COMPLETED. If no acknowledgement is received from the master, this will be indicated by TX_TRANSFER_FAILED, which either means that the message failed to reach the master, or that the response from the master failed to reach the slave. In this case the slave’s application layer may retry the message. A third possible scenario is that the channel is dropped and the slave begins to search; in this case the event GO_TO_SEARCH will be received, instead of either of the other two commands. If GO_TO_SEARCH is received then the acknowledged message will not be sent, and the channel should be unassigned

    • I dont' understand. What kind of information?
    • Depends on when you tell the stack to send the message, and the channel period. See the Figure 9-2 for more information.
  • 0 in reply to Petter Myhre

    Hi Petter,

    In the end I found that my own developed SW ACK works better for my application than the ANT own ACK, since I can control every parameter. Thanks anyhow for the answer, was helpful in solving my question.

    Best,

    Angel.

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