Zigbee send character string with 250 symbols

[Bwko]

Hello,

 

I'm trying to send a character string(zb_uint8_t) with 250 symbols from my Zigbee end device to my Zigbee coordinator by using the nRF Connect SDK v2.2.0. To send the character string I'm using the zb_zcl_set_attr_val function. 

This partially works, I'm receiving the character string at my coordinator but unfortunately the character string gets truncated to around 50 symbols. I'm guessing that I'm hitting a Zigbee size limitation. 

 

Is there any way to send this payload to my coordinator? Perhaps by using other data types or by sending multiple packets/frames to my coordinator?

Are there some examples on how to achieve this?

 

Thanks in advance!

[Amanda Hsieh]

Hi, 

I am looking into this case and will reply later. 

Regards,
Amanda H.

[ArthurChen]

Hi, 

This is also an important requirement for us.  We need to send an encrypted message from the cloud to our ZED, which is 128 bytes, but if we cannot send it as a whole, we need to cut it to many pieces and make the application layer more complicated.  We want to define zigbee cluster on ZC and ZED with octave string of length that can hold more than 128 bytes, and then use write attribute command to do the communication between the ZED and ZC.  Thus we really would like to be able to send/receive 128 bytes at once, or let the zboss stack to handle the fragmentation for us, instead of doing fragmentation at application layer program by ourselves.

[Bwko]

Hi Amanda,

Thank you for looking into this issue. Do you have an update about this case?

[Amanda Hsieh]

I have not gotten a reply from the team yet. 

-Amanda H.

[Amanda Hsieh]

Hello, 

Would it be an option to use a custom cluster that uses an attribute of type long octet string? Such an attribute should allow to send/receive long data (>256 Bytes) by reading/writing to an attribute. A small change in ZCL will be required, and it is not tested yet, but we just want to check if that could be an option first.

-Amanda H.