Routing all traffic to particular IP address via wifi network interface on MacOS

route_wifi.sh

#!/bin/bash

# NOTE: wifi network interface is: en1
wifi_router=192.168.200.1
wifi_address=en1:ec.35.86.4f.00.bc
TOADDR=`ifconfig en1 inet | sed -nl 's/\w*inet \([^ ]*\).*/\1/p'`
TO=`echo -n ${TOADDR//[[:space:]]}`

echo "ADDING ROUTE TO $1 VIA en1 (wi-fi): $TO"
route -n add -host $1 $wifi_router -ifp $wifi_address -ifa $TO -static

echo ""
echo "ROUTE ADDED:"
route get $1