From: Jiang Jiang Jian <jack@espressif.com>
Date: Wed, 25 Jan 2017 13:39:17 +0000 (+0800)
Subject: Merge branch 'lwip/optimize_dhcpc_taken_time' into 'master'
X-Git-Tag: v2.0-rc2~78
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=32ad1e676dbcd4cbcf2456155b5b4132130769a2;p=esp-idf

Merge branch 'lwip/optimize_dhcpc_taken_time' into 'master'

lwip: optimize the dhcp client

1. modify the discover retry backoff time from (2,4,8,16,32,60,60)s to (500m,1,2,4,8,15,15)s.
2. add DHCP_DOES_ARP_CHECK to menuconfig for users to specify if do a ARP check on the offered address.
   If enable, one more second will be taken.

See merge request !459
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32ad1e676dbcd4cbcf2456155b5b4132130769a2