Re: [lwip-users] Very first thing I should see on network??

[address@hidden]

Am 18.04.2020 um 22:31 schrieb Dave Nadler:
> Solved my problem (two warring CubeMX fixes to fix a deadlock created -
> another deadlock)...
> Still interested for my education - what should be the very first thing
> I see from lwip on the network?

You'd normally see ARP or DHCP requests first, depending on your config.
You can have a config with static IP that does not even send a
gratuitous ARP though. In that case, nothing would be sent.

Regards,
Simon

> Thanks,
> Best Regards, Dave
>
> On 4/17/2020 8:48 PM, Dave Nadler wrote:
>>
>> Sorry if this is a dumb question. I have a board using STM32F437 and
>> LAN8742A.
>> At one point I had this working, but something is broken either in my
>> code or the latest ST CubeMX fiasco code.
>> I can see the the 50MHz RMII clock is AOK, the initialization software
>> seems content that
>> it has initialized both the internal ST Ethernet peripheral and the
>> LAN8742A.
>> But nothing happens...
>>
>> So, the question:
>> What is the very first thing I should see on the network using WireShark?
>> I'm definitely not a network guru...
>>
>> The LwIP debug log is below in case its helpful...
>>
>> Thanks in advance for any tips!
>> Best Regards, Dave
>>
>> etharp_timer
>> netif: added interface st IP addr 0.0.0.0 netmask 0.0.0.0 gw 0.0.0.0
>> netif: setting default interface st
>> dhcp_start(netif=0x2000b798) st0
>> dhcp_start(): mallocing new DHCP client
>> dhcp_start(): allocated dhcp
>> dhcp_start(): starting DHCP configuration
>> dhcp_discover()
>> transaction id xid(4bb5f646)
>> dhcp_discover: making request
>> dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST,
>> LWIP_IANA_PORT_DHCP_SERVER)
>> ip4_output_if: st0
>> IP header:
>> +-------------------------------+
>> | 4 | 5 |  0x00 |       336     | (v, hl, tos, len)
>> +-------------------------------+
>> |        0      |000|       0   | (id, flags, offset)
>> +-------------------------------+
>> |  255  |   17  |    0x0000     | (ttl, proto, chksum)
>> +-------------------------------+
>> |    0  |    0  |    0  |    0  | (src)
>> +-------------------------------+
>> |  255  |  255  |  255  |  255  | (dest)
>> +-------------------------------+
>> ip4_output_if: call netif->output()
>> ethernet_output: sending packet 0x20004f04
>> dhcp_discover: deleting()ing
>> dhcp_discover: SELECTING
>> dhcp_discover(): set request timeout 2000 msecs
>> StartDefaultTask main loop...
>>
>
>
>
> --
> Dave Nadler, USA East Coast voice (978) 263-0097, address@hidden, Skype
>  Dave.Nadler1
>
>
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