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CC254x sending larger MTU data through one L2CAP request

marmottus
Prodigy 40 points

Hello,

I'm trying to write to a long characteristic  using PrepareWrite requests but my data is over 500 bytes which means nearly 30 PrepareWrite and that takes too much time. 

I tried to send several packets via HCI_SendDataPkt and using continuation packets boundary, the controller received everything and issued a PrepareWrite Response that I can see via a packets sniffer but in my HostTest application I can't see this response.

If I issue a regular ATT_PrepareWriteReq with a data size of 18 using the regular TI function, I receive the response.

Is there a way of writing/reading to long characteristics within one command ?

How can I receive responses from controller when issuing HCI data packets commands ?

Thanks a lot.

  • 0
    TI__Genius 9325 points
    Hi marmottus,

    To write a long attribute, you need to use ATT_PrepareWriteReq by the spec. Also, please also note that there are some constraints in CC254x stack, such as NPI packet length and # of prepare write requests for an attribute. The maximum packet length of the NPI which is the interface between HostTestApp and the dongle is 255 and the # of prepare write requests is 5.

    - Cetri