Raspberry Pi 3にUSB無線LANアダプタを接続し，インターネット接続を維持しつつアドホック通信を行う ref: https://qiita.com/YutoMizutani/items/a74af25c856a14d9fd0b

file0.txt

pi@~ $ cat /proc/cpuinfo
Hardware    : BCM2835
Revision    : a22082

pi@~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 8 (jessie)"

file1.txt

$ system_profiler SPSoftwareDataType
System Version: macOS 10.13.4 (17E202)

$ sysctl hw.model
hw.model: MacBookPro12,1

file2.txt

pi:~ $ sudo sudo vi /etc/network/interfaces

file3.txt

iface wlan1 inet manual
auto wlan1
iface wlan1 inet static
    address 192.168.<foo>.<bar>
    netmask 255.255.255.0
    wireless-channel 1
    wireless-mode ad-hoc
    wireless-essid <display name>
    # wireless-key <104 bit WSP>

file4.txt

pi:~ $ sudo ifdown wlan1
pi:~ $ sudo ifup wlan1
pi:~ $ sudo reboot

file5.txt

$ sudo ssh <pi name>@<wlan1 IP address>