Hi, I have a Campbell Scientific CR300 datalogger that can talk PPP over serial. I also have an Xbee 3 Cat 1 modem. The doc for the modem suggests I can only do PPP over USB, though an older brochure suggests it supports PPP over serial. Can I set up the Xbee 3 Cat 1 to talk PPP over the UART/serial interface? I understand that I should not use "bypass" mode.