Zigbee gateway integration

[tomnord]

Hello again. I've been scripting to read and write some attributes.
Command is as follows:

res, err = zb.cmdsync('setrawattribute', 'a49e69fxxxxxx' , 513, 1043, true, 'bool')

The command value "true" does as it should, but when writing "false" I get "No response".
It's the same for all other 'bool' attributes.

Is this component issue or zigbee app issue?

Thanks in advance.