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LAUNCHXL-CC1310: TI 15.4 packet size vs dwell time

Benson Lo
Intellectual 740 points
Part Number: LAUNCHXL-CC1310

Hi,

For the TI 15.4 stack, I found the default dwell time is set to 250ms in the collector example.

1) What is the maximum packet length can be sent in this interval?

2) What happens if the packet length exist the dwell time, can the stack divides the packet into multiple smaller packets?

3) If there is 10 nodes, report time set to 1 second. Dwell time has to be smaller than 100ms, right?

Thanks,

Benson

  • 0
    Expert 1440 points
    The same question. Anyone can give a full explanation?
  • 0
    TI__Expert 4375 points

    Hey Benson,

    Sorry for the late reply. To answer your questions:

    1. The theoretical maximum @50 .kbps is 50000/4 = 12.5 kb packet = 1.56 KB packet.
    2. The maximum packet length TI 15.4-Stack can support is 500 Bytes. So fragmenting the data into smaller packets is strongly suggested. I would recommend starting with a payload of 128 and try bumping it up from there.
    3. not necessarily. Dwell time is how long the device stays on a particular channel. The sensor nodes use CSMA-CA to ensure the air clear for transmission before sending out data.

    ~Brocklobsta

  • 0 in reply to Brocklobsta
    Expert 1440 points
    But I have encountered a problem that he collector cannot receive a packet at the sensor's reporting interval but just can receive partial of them at a non-fix interval. (ps: The sensor send 120bytes data per second). What's wrong with it,or, Is there any parameters that can influence how ofen the colletcor receive a packets?