Re: [lwip-users] Strategy Question for DHCP

[Robert Deschambault]

Hi,

Ok, did another little experiment and I notice that if I don't call dhcp_stop() in the DHCP state machine when the IP address gets assigned I can ping my target when I use AUTOIP.  Autoip is in state 3 (bound) and everything is fine.  When I call dhcp_stop() at any time, autoip goes to state 0 (stop) and I lose comms with the target.

My question is this:  What should I be doing once the IP address is assigned by either DHCP or AUTOIP in coop mode?  Any call to dhcp_stop() seems to be the wrong answer.  But all the examples I have seen for an STM32F4xx call that function once the IP address has been assigned.  Any comments?

On Wed, Jun 17, 2015 at 8:28 PM, Robert Deschambault <address@hidden> wrote:

Hi,

I did a quick test to see when the autoip state is set to stop.  It looks like that when the IP address becomes non-zero, the DHCP code recognizes the assignment and makes a call to dhcp_stop() which I believe is calling autoip_stop() function coop mode.  Here is what the printf debug looks like at assignment (my code is also printing stuff too and please remember I have modified the default IP address pool for my application):

...

dhcp_discover()

transaction id xid(abcd0001)

dhcp_discover: making request

dhcp_discover: realloc()ing

dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)

dhcp_discover: deleting()ing

dhcp_discover: SELECTING

dhcp_discover(): set request timeout 16000 msecs

autoip_tmr() AutoIP-State: 2, ttw=6

autoip_tmr() AutoIP-State: 2, ttw=5

autoip_tmr() AutoIP-State: 2, ttw=4

autoip_tmr() AutoIP-State: 2, ttw=3

autoip_tmr() AutoIP-State: 2, ttw=2

autoip_tmr() AutoIP-State: 2, ttw=1

autoip_tmr() AutoIP-State: 2, ttw=0

autoip_bind(netif=20000778) cd0 192.168.252.11

autoip_tmr() AutoIP-State: 2, ttw=20

autoip_tmr() AutoIP-State: 2, ttw=19

MAIN: Network assigned by DHCP server:

dhcp_stop()

MAIN:    IP:    192.168.252.11

MAIN:    SN:    255.255.255.0

MAIN:    GW:    192.168.252.1

autoip_tmr() AutoIP-State: 0, ttw=18

autoip_tmr() AutoIP-State: 0, ttw=18

autoip_tmr() AutoIP-State: 0, ttw=18

...

after this the last line is repeated over and over again.  ttw always stays at 18 and the state is always 0 (stop).  I don't know if this the expected behavior?

-- 

Bob Deschambault

--

Bob Deschambault
6614 Astro Court, Mississauga
Ontario, Canada L5N 7J2
home: 905 824 7159
cell: 416 457 7163

twitter: @rdeschambault

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