I have a device running lwip stack and httpd server. The device has an
external 2MB SPI Flash memory. The CPU is a microcontroller with 512kB
internal Flash.
I'd like to upgrade the firmware (the internal Flash memory) by download
the new binary from Internet. The user can check the presence of a new
firmware version through the web pages answered from httpd.
When the user activates the remote upgrade, the device should download
the binary file from a server and save it to the external Flash memory.
After a reboot, the bootloader detects the new firmware on the external
memory and copy it to the internal Flash memory.
Now I don't know how to download a file from Internet. FTP client? HTTP
client? Any other protocol? I'd like to use a standard server (FTP,
HTTP, ...), anyway this isn't a must.
Please, give me a suggestion. Thank you.
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