I was using a BBB (rev C) and able to read analog inputs on it :
- enable ADC : 
/sys/bus/iio/devices$ *ls*
iio_sysfs_trigger
/sys/bus/iio/devices$ *sudo sh -c "echo BB-ADC > $ SLOTS"*

- read value :
/sys/bus/iio/devices$ *ls*
iio:device0 iio_sysfs_trigger
$* cat /sys/bus/iio/devices/iio:device0/in_voltage0_raw*
3831
 
but on the BBB wireless i don't know how!?

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