#!/bin/sh
# Based on work of Samuel Hailu, 2020-09-10

if [ $# -ne 2 ]; then
    echo "$0 ip-address interface"
    echo "    ip-address: where to find the OpenWRT device"
    echo "    interface: which interface (eth3 for instance) is the LTE device"
    exit 1
fi

my_ip=$1; shift
interface=$1; shift

cat <<EOF | ssh -t "root@${my_ip}"
set -x

# update the sources & allow https handling
opkg update
opkg install libustream-openssl ca-bundle ca-certificates

# Install needed kernel module
opkg install kmod-usb-net-cdc-ether usb-modeswitch

# Create interface
uci set network.LTE=interface
uci set network.LTE.ifname='${interface}'
uci set network.LTE.proto='dhcp'

# add to correct firewall zone
current_networks=\$(uci get firewall.@zone[1].network)

if ! echo \$current_networks | grep -q LTE; then
   uci set firewall.@zone[1].network='\${current_networks} LTE'
fi

# commit
uci commit

# reboot

reboot

EOF