[U-Boot] UDP packet sender

[Gaëtan Carlier]

Joe,
On 01/23/2018 01:54 AM, Joe Hershberger wrote:
> On Mon, Jan 22, 2018 at 5:28 PM, Gaëtan Carlier <gcembed at 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 at 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.

a) I can/want not enable netconsole when the product is on the network of the customer.
b) Once on customer LAN, everything is DHCP.
c) I don't want to increase load of CPU because updating software on customer's computer has to decode all UDP frames sent by U-Boot while 10% of UDP are really needed (several boards can be on the same network).


> 
> 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

Regards,
Gaëtan.