Limits number of topic-readers

[neomehmet]

are there any restriction about the number of datareader in one session ?
when the datareader_req variables exceeds 6, function returned FF value after sixth vars.
uint16_t datareader_req = uxr_buffer_create_datareader_xml(&session, reliable_out, datareader_id, subscriber_id, datareader_xml, UXR_REPLACE);
#define UXR_STATUS_NONE 0xFF //Never sent or received. It is used for managing an unknown status