# Match descriptor request/response issue **URL:** \ **Category:** XBee & XBee Gateway\ **Tags:** packet, recieve, zigbee\ **Created:** [February 27, 2018, 6:37am UTC](https://forums.digi.com/t/match-descriptor-request-response-issue/19227 "2018-02-27T06:37:22Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![eltham](https://avatars.discourse-cdn.com/v4/letter/e/a8b319/32.png) [@eltham](https://forums.digi.com/u/eltham)\ **Post date:** [February 27, 2018, 6:37am UTC](https://forums.digi.com/t/match-descriptor-request-response-issue/19227/1 "2018-02-27T06:37:22Z")
I need to use XB24C ZIGBEE module as a coordinator to handle some ZIGBEE messages like Match Descriptor Request, but I can’t receive Match Descriptor Request from XBee serial port. Dose anyone can help me. Thanks. BTW, Silicon Labs ZIGBEE stack can allow user register service descriptor request/response to stack, and it will be handled by the stack automatically, does XBEE has this API? ---
**Author:** ![jlovinger](https://avatars.discourse-cdn.com/v4/letter/j/f05b48/32.png) [@jlovinger](https://forums.digi.com/u/jlovinger)\ **Post date:** [March 4, 2018, 4:09am UTC](https://forums.digi.com/t/match-descriptor-request-response-issue/19227/2 "2018-03-04T04:09:59Z")
Set ATAO=3 on your XBee. This will enable pass-thru of ZDO messages so that you can respond from your application rather than handled by the XBee. Documented as “3 - enable ZDO passthrough of ZDO requests to the serial port which are not supported by the stack, as well as Simple\_Desc\_req, Active\_EP\_req, and Match\_Desc\_req.” You might also take a look at the linked library. It is provided by Digi and implements a lot of ZDO and ZCL support on top of the XBee. Ported to several platforms and not hard to add support for a new platform. Even if you don’t use it might be a reasonable reference. [https://github.com/digidotcom/xbee\_ansic\_library](https://github.com/digidotcom/xbee_ansic_library)