Passing the hostname is currently broken in since the shipped busybox includes this commit:
https://git.busybox.net/busybox/commit/networking/udhcp/dhcpc.c?id=
2017d48c0d70bef8768efb42909e605ea8eb5a21
Before:
Sun Jan 31 18:11:32 2016 daemon.notice netifd: Interface 'wan' is now down
Sun Jan 31 18:11:32 2016 daemon.notice netifd: Interface 'wan' is setting up now
Sun Jan 31 18:11:32 2016 daemon.notice netifd: wan (18158): udhcpc: option -h NAME is deprecated, use -x hostname:NAME
Sun Jan 31 18:11:32 2016 daemon.notice netifd: wan (18158): udhcpc: malformed hex string 'WR150'
After:
Sun Jan 31 18:11:33 2016 daemon.notice netifd: wan (18169): udhcpc (v1.23.2) started
Sun Jan 31 18:11:33 2016 daemon.notice netifd: wan (18169): Sending discover...
Sun Jan 31 18:11:33 2016 daemon.notice netifd: wan (18169): Sending select for xxx.yyy.zzz.xyz...
Sun Jan 31 18:11:33 2016 daemon.notice netifd: wan (18169): Lease of xxx.yyy.zzz.xyz obtained, lease time 600
Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>
-s /lib/netifd/dhcp.script \
-f -t 0 -i "$iface" \
${ipaddr:+-r $ipaddr} \
- ${hostname:+-H "$hostname"} \
+ ${hostname:+-x "hostname:$hostname"} \
${vendorid:+-V "$vendorid"} \
$clientid $broadcast $release $dhcpopts
}