Re: [lwip-users] Download a file for firmware upgrade

[Jim Pettinato]

One other possibility you might want to consider is to implement an FTP (or 
TFTP) _server_, rather than a client, on your lwIP device; this allows for push 
updates if desired. The user can then (optionally) accept the new image for 
installation locally. Down side is that this is even trickier as far as 
piercing firewalls, since end users would need to allow external ftp access to 
the device in the field or use a local ftp client from behind the firewall to 
download the update to the lwIP device.


-----Original Message-----
From: lwip-users [mailto:address@hidden On Behalf Of Sergio R. Caprile
Sent: Monday, May 21, 2018 8:26 AM
To: address@hidden
Subject: Re: [lwip-users] Download a file for firmware upgrade

You can do whatever you want.
The question is probably not what can you do but what do you have available to 
obtain what you need with lesser effort.
There are FTP clients around, I've collaborated in one of them using the RAW 
API, search the list.
FTP is sometimes tricky and can give you some headaches with firewalls (and/or 
admins).
For HTTP you need a client. I wouldn't just GET and hope everything is fine 
unless I can manage both ends (that means: the server too) and guarantee there 
won't be other stuff than my file. A HTTP client can be quite complicated, but 
you just need to get one resource at a specific URI You can even have a 
proprietary protocol running over TCP or UDP. If your device will be sold and 
installed on corporate networks, you might raise some concern among the net 
admins, asking to have open holes in the firewall does not seem to be a good 
way to make friends.

My bet is to go for the user to upload the file, leveraging your web server; 
but if you must go out and get it, then perhaps FTP is the easiest full client 
and HTTP is the simplest firewall piercing. I don't know if there are running 
clients around. Particularly for your API, which you don't say. (I'm 
intentionally not considering TFTP for going out because of the possible 
firewall issue, but if it is your network, there is a client already available)

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