Why almost? Because Rpi0w uses ttyS1 instead of ttyAMA0 desipte being part of the RPi1 family... ...But it will work fine for the _second_ boot onwards, if things go according to plan. For all other RPi models, it should work from the first boot on.
Why almost? Because Rpi0w uses ttyS1 instead of ttyAMA0 desipte being part of the RPi1 family... ...But it will work fine for the _second_ boot onwards, if things go according to plan. For all other RPi models, it should work from the first boot on.