Congratulations on getting the gateway up and working so that you're able to telnet into it.
I see from your first post that you get "Unknown radio: 34" in the initial output on powering up. The code reads a version identifier from the SX1272 chip and compares it to 0x12. I wouldn't worry about the mismatch. The chip version for the SX1272 may be different than for the SX1278. The good news is that you're reading a number and not getting all 1's (0xFF) or all 0's (0x00), which tells me you probably are talking to the SX1272 successfully.
So, you're asking why you're not receiving and transmitting messages. Do you have a node working? What channel is it transmitting on? Is it the same as the gateway?
What spreading factor are you using? Have you tried changing the gateway to listen to a single spreading factor, rather than "ALL_SF"? You'll want to get the gateway receiving successfully from the node before attempting to respond to it. Remember that in the Lorawan protocol, gateways only communicate in response to messages received from nodes. So until you're receiving messages from the node, you won't see any transmit activity (and not even then unless you've given the gateway instructions to send a response). I haven't attempted to do communication the gateway to node direction, so I don't have any experience to share with that.