I have a mmdvm_hs board on a Pi Zero W. It's a cheap chinese knockoff but I can get it online via wifi. And it does answer back to my dstar radio. It even shows green connection to Dstar network and will even link to a reflector if I do it in the admin page. However, it will not link via radio commands, and the pi-star dashboard never shows any rf activity even though it broadcasts time and link info. It will only link if I go into the admin page and tell it to link to a reflector, and then it anounces the link. But I cannot talk, or hear any traffic on any reflector I choose. I have manually set an IP address on my router and the mmdvm, and opened all ports directed to that IP. I believe the hat radio has a problem since it doesn't report rf traffic but perhaps its just off frequency. I put in the recommended offset -475RX, and tried all kinds of settings with the same results. It does improve the anouncement voice a little but that's it. Not tried any TX offsets... I've even tried wifi to my phone with the same results. Ive even direct tied it via an ethernet/usb adaptor with same results.... Anyone have any ideas...? It does send my call letter back to the radio after a key up but that's all it does.