Download or compile a suitable binary
$ scp cloudflared root@[routerip]:/opt/sbin
$ ssh root@[routerip]
$ cd /opt/sbin
$ chmod +x cloudflared
$ ./cloudflared tunnel login
$ ./cloudflared tunnel create $HOSTNAME
$ ./cloudflared tunnel run $HOSTNAME
Copy the init script from this repo
$ scp cloudflared root@[routerip]:/etc/init.d
$ ssh root@[routerip]
$ chnod +x /etc/init.d/cloudflared
$ /etc/init.d/cloudflared enable
$ /etc/init.d/cloudflared start