From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Hershberger <joe.hershberger@gmail.com>
Date: Mon, 22 Jan 2018 18:54:57 -0600
Subject: [U-Boot] UDP packet sender
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On Mon, Jan 22, 2018 at 5:28 PM, Gaëtan Carlier <gcembed@gmail.com> wrote:
> Hi Joe,
>
> On 01/22/2018 11:46 PM, Joe Hershberger wrote:
>> Hi Gaëtan,
>>
>> On Thu, Jan 18, 2018 at 4:56 AM, Gaëtan Carlier <gcembed@gmail.com> wrote:
>>> Hi,
>>> I would like to implement a new command and submit it to the mailing list.
>>> The command will have the following format:
>>> udpsend <destination/broadcast ip> <destination port> <source port> <text to send>
>>>
>>> udpsend 255.255.255.255 4040 0 hello world
>>>
>>> If source port is 0, a random port will be used (11000 + (get_timer(0) % 4096))
>>
>> I'd like to understand the purpose / use-case for this command? Maybe
>> there is a more appropriate way to solve the problem you have instead.
>>
>
> I want to send the current progression of an update script. As the board has no display/leds, the only way to get update progression is to broadcast UDP packet that a PC software will monitor. U-Boot will load/source a script from an ext4 partition. This script will load a rootfs image from update partition of an eMMC splitted into 10M chunks that will be written to an other partition of the eMMC.
> This is for update on site (by customer).
>
> This UDP command will also be used in a closed production LAN to send Unique ID of the CPU (secret) and the MAC address to the monitoring production (burning) software that will feed a database to be able to generate license keys linked to hardware and print a label with the product name and the MAC address.
>
> Maybe there is already existing command that I can use from a U-Boot script ?

I think this is commonly done by enabling netconsole and controlling /
monitoring progress based on console output sent over UDP.

Cheers,
-Joe

>>> Where do I have to place my code : cmd or net directory ?
>>> For me cmd will be the better directory to keep it away from all more complex stuff like DHCP, TFTP, ...
>>
>> That's probably true. cmd/ would be the appropriate place.
>>
>> -Joe
>>
>
> Regards,
> Gaëtan