Permission denied <- you have either to diddle the permissions of usb devices, put your user which runs boblightd in a group which has write access to usb devices or last but worst run the deamon as root.
AppleTV4/iPhone/iPod/iPad: HowTo find debug logs and everything else which the devs like so much: click here
HowTo setup NFS for Kodi: NFS(wiki)
HowTo configure avahi (zeroconf): Avahi_Zeroconf(wiki)
READ THE IOS FAQ!: iOS FAQ(wiki)