• Locked Locked
  • Replies 1 reply
  • Subscribers 54 subscribers
  • Views 236 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Limitation on frame size

pascalfifre
Prodigy 40 points
Other Parts Discussed in Thread: CC2520, CC2430

Hi,

 

I'm working with ZStack Pro 2007 on MSP4302618 + CC2520.

I try to send an AF_DataRequest with 90 bytes of data from an end device to coordinator. The frame seems to accept by the ZStack, I follow the transmission to the spiFifoAccess and all seems to be good. The total length of frame write to the CC2520 is 116 bytes long.

When I send an AF_DataRequest with 86 bytes there is no problem.

But, the coordinator doesn't received the frame and the packetSniffer (on the SmartRF04 with CC2430) shows : "ERROR!!! Parsed data To long! Data Length:1419".

I think, there is a problem in the Packet Sniffer because when I start to send the same frame at the beginning of Packet Sniffer Session, the frame was decoded by Packet Sniffer.

 

Can anybody help me ????

 

Thanks a lot

  • TI__Mastermind 19525 points

    Pascal,

    AS far as I remember a full IEEE 802.15.4 frame is 127 bytes, the IEEE 802.15.4 overhead is 25 bytes, so now you are left with a 102 bytes before you start to add the ZigBee overhead for NWK, APS, and Security layer.

    This overhead add about another 17 without security I believe. This means that what you have left for application data payload is 85 bytes.

    Enjoy,
    LPRF Rocks the World