horace:
I seem to remember that DIO1 goes high on recipt of OTAA downlink message not sure about peer-to-peer though
does the peer receive the transmission OK?
I think that only DIO0 is required for normal LoRa. I haven't tried receiving yet as I first wanted to succeed sending something, But I could try that.
But is it normal that it is always high as it is triggered on RISING? Maybe some pull-up problem?