I couldn't find anything called a "Focus AXRe", looking at a few different products that came up for "Gridstream RF" the compliance docs only list that they're zigbee coordinators, not endpoint devices. ex: https://zigbeealliance.org/zigbee_products/gridstream-rf-enh... see 8.1 on pg 7. AFAIU, that means it expects to control other zigbee devices, not report to coordinators like the ST hub.