Atmega2560 pins 17 and 16 switched on datasheet.

I think pins 17 and 16 are labeled wrong in the Mini-Rambo.pdf (https://github.com/johnnyr/Mini-Rambo/blob/1.3a/board/Project%20Outputs%20for%20Mini-Rambo/Mini-Rambo.PDF). According pins_arduino.h (https://github.com/ultimachine/RAMBo/blob/master/ArduinoAddons/Arduino_1.x.x/rambo/variants/standard/pins_arduino.h) pin 16 should be labeled TX2, and pin 17 should be labeled RX2.

[leptun]

Can confirm. Spent a couple of weeks not knowing why they didn't work. Thank you soooooo much for pointing it out.