@spacejay it's always hard to judge a user's experience level. Anyway, great you created a workaround and can continue!

It's strange ! Can you post a picture of your sensor and gateway ? Have you try with a second nano ? It's not normal to have nothing on the serial monitor when using USB. One thing you can do it's to connect a LED to any digital pin and switch it on at the end of the init() function ?? David.