How to login from MacOS:

1. Connect to the BeagleBone by a USB cable.
2. MacOS restart is necessary for some reason.
3. SSH to 192.168.7.2

WiFi setup:

Use connmanctl as described in /etc/network/interfaces.

root@beaglebone:~# connmanctl
connmanctl> tether wifi disable
Error disabling wifi tethering: Already disabled
connmanctl> scan wifi
Scan completed for wifi
connmanctl> services
Analog20 wifi_xxxxxxxxxxxxxxxxxxxxxxxxxxx_managed_psk
connmanctl> agent on
Agent registered
connmanctl> connect wifi_xxxxxxxxxxxxxxxxxxxxxxxxxxx_managed_psk

… and so on

Following links give useful information:
http://xx-prime.hatenablog.com/entry/2016/08/13/012059 (in Japanese)

https://www.mail-archive.com/beagleboard@googlegroups.com/msg40785.html

The wlan0 device power management can be turned off by

# iwconfig wlan0 power off

TBD how to turn this off permanently.

Take SD backup

1. Insert the SD into the MacBook
2. “diskutil list” to know the path to the device.
3. run “sudo dd if=<device_name> conv=sync,noerror | gzip -c > archive.img.gz

Following link is helpful to know how to backup disks in several styles:

https://wiki.archlinux.org/index.php/disk_cloning

Connecting to the host via serial port

Useful when the SSH access has a problem:

$ ls /dev/tty.*
$ screen