## USB Tether

This needs extra planning, since network isn't avaialable without it.
Download the needed packages (see below) manually, before upgrading, from:
- Kernel-land: https://downloads.openwrt.org/releases/18.06.2/targets/ar71xx/generic/
- User-land: https://downloads.openwrt.org/releases/18.06.2/packages/mips_24kc/base/

After upgrade, copy them to the router:

```
user@laptop$ scp *ipk root@192.168.1.1:/tmp/
kmod-mii_4.4.92-1_mips_24kc.ipk              100% 3515   412.5KB/s   00:00
kmod-usb-net_4.4.92-1_mips_24kc.ipk          100%   13KB   1.1MB/s   00:00
kmod-usb-net-cdc-ether_4.4.92-1_mips_24kc.ip 100% 3757   588.9KB/s   00:00
kmod-usb-net-rndis_4.4.92-1_mips_24kc.ipk    100% 4965   930.4KB/s   00:00
librt_1.1.16-1_mips_24kc.ipk                 100%  883   325.2KB/s   00:00
libusb-1.0_1.0.21-1_mips_24kc.ipk            100%   25KB   1.1MB/s   00:00
usbutils_007-6_mips_24kc.ipk                 100%  226KB 323.6KB/s   00:00
```

Then install them:

```
root@router# cd /tmp && opkg install *.ipk
```

Reboot router, plug phone in (physically disconnect & reconnect if needed),
and check logs:

```
# logread
Wed Oct 18 09:31:10 2017 kern.info kernel: [ 2209.308375] usb 1-1: new high-speed USB device number 5 using ehci-platform
Wed Oct 18 09:31:10 2017 kern.info kernel: [ 2209.470417] rndis_host 1-1:1.0 usb0: register 'rndis_host' at usb-ehci-platform.0-1, RNDIS device, 96:85:1d:1b:99:4f
Wed Oct 18 09:31:10 2017 daemon.notice netifd: Interface 'TETHER' is enabled
Wed Oct 18 09:31:10 2017 daemon.notice netifd: Network device 'usb0' link is up
Wed Oct 18 09:31:10 2017 daemon.notice netifd: Interface 'TETHER' has link connectivity
Wed Oct 18 09:31:10 2017 daemon.notice netifd: Interface 'TETHER' is setting up now
Wed Oct 18 09:31:11 2017 daemon.notice netifd: TETHER (2845): udhcpc: started, v1.25.1
Wed Oct 18 09:31:11 2017 daemon.notice netifd: TETHER (2845): udhcpc: sending discover
Wed Oct 18 09:31:14 2017 daemon.notice netifd: TETHER (2845): udhcpc: sending discover
Wed Oct 18 09:31:16 2017 daemon.notice netifd: TETHER (2845): udhcpc: sending select for 192.168.42.88
Wed Oct 18 09:31:16 2017 daemon.notice netifd: TETHER (2845): udhcpc: lease of 192.168.42.88 obtained, lease time 7200
Wed Oct 18 09:31:16 2017 daemon.notice netifd: Interface 'TETHER' is now up
Wed Oct 18 09:31:16 2017 daemon.info dnsmasq[1327]: reading /tmp/resolv.conf.auto
Wed Oct 18 09:31:16 2017 daemon.info dnsmasq[1327]: using local addresses only for domain lan
Wed Oct 18 09:31:16 2017 daemon.info dnsmasq[1327]: using nameserver 192.168.42.129#53
Wed Oct 18 09:31:16 2017 user.notice firewall: Reloading firewall due to ifup of TETHER (usb0)
```


## Samba & NTFS-3g

Let opkg slurp in dependencies (samba*-server, fuse)

```
root@router# opkg install luci-app-samba kmod-usb-storage ntfs-3g
```

Then add this in rc.local, so it stays mounted after reboot:

```
mount | grep -q '/dev/sda1\>' \
  || [ ! -r /dev/sda1 ] \
  || mount /dev/sda1 /mnt/sda1
```

Log out & in to LuCI, and configure Samba from there.


## Building packages via the SDK on Linux

https://openwrt.org/docs/guide-developer/using_the_sdk

The SDK:
https://downloads.openwrt.org/releases/18.06.2/targets/ar71xx/generic/openwrt-sdk-18.06.2-ar71xx-generic_gcc-7.3.0_musl.Linux-x86_64.tar.xz