I could not imagine, that just a teensy 3.1 should have a malfunction in the usb.
we have built several nodes based on Thomas' code and teensy-lc and teensy 3.2 with hoperf RFM92W & RFM95W. all of them could be debugged via serial.print on the usb.
I also use Termite 3.1 on win10 as an usb-terminal. maybe that works?
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Teensy+Lora+Multitech Gateway
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