802.15.4 Packet Size

[Ted Herman]

Hello,

I've been testing 802.15.4 single PHY (no softdevice) and analyzing packets on a TI CC2531, just to check interoperability. Things seem to work well when the packet size is at most 29 bytes. When I increase the packet size to 30 or more, the packet reception is poor (maybe some packets get through, many get CRC errors). I had thought that the limitation was 127 bytes for the 802.15.4 standard. 

In a way, 29 bytes makes sense: considering the first byte (not in the packet) is the length, then the two auto-generated CRC bytes as the footer, we get the magic number of 32 bytes. Is that what's going on, 32 bytes is the actual limit?

Thanks,

Ted 

[Ted Herman]

I tried with a few different CC2531s, and there does seem to be a hardware or software problem, though details are unclear so far.

[Techlover]

Hi Ted,
Have you been using this one? https://elektronicavoorjou.nl/product/cc2531-usb-stick-dongle-zigbee/ CC2531 
I think that there is a new one that might work better.