Add support for more fritz devices and tftp

[maurerle]

this feature adds support for more fritz devices:

• FR1200
• FB7412
• FB7430
• FB7362sl
• FB7520/7530
• FR3000
• FR1750e

this includes copying and writing the sysupgrade image if existing and doing all TFTP related extras for 7520/7530/1200.

And also executes the sysupgrade after booting initramfs if --sysupgrade $IMAGENAME is given.

It is currently completely tested for all added devices and additionally:

• FB7360SL
• FB7362sl
• FB4040
• FB4020

[maurerle]

@herbetom could you please look into this and give feedback?

I think it would be cool to have an easier flashing method for the 7520 in the upstream fritzflash project :)

[herbetom]

@maurerle I've merged some "docs stuff" in the past, but thats about it. Most of the code is from @blocktrron.

I appreciate you trying to add new features. Hoewer, tbh i'm not sure how i should even start to review this PR. Multiple things are being adjusted / features added, but the docs ( /docs - fritz-tools.readthedocs.io) have not been adjusted for the most part and the commits don't seem to have been squashed into sensible pieces.

(I haven't looked to deeply, but i'm not a fan of adding+deleting an ip address where it's unclear if fritzflash is even responsible for configuring it in the first place.)

idk, maybe @blocktrron has some advice

[grische]

@maurerle I was not able to get this to work with the FB7520 on a Windows host. It was never able to complete the auto-discovery on LAN1 (there was never a link), LAN2, LAN3 but I think it did work once on LAN4.

When I forced the autodiscovery by manually starting tftp and logging into the device (that effectively halts the boot), then I got the following error:

Once you're ready to flash, press enter, disconnect power from your AVM device and reconnect the power-supply.

Trying to autodiscover! Abort via Ctrl-c.
FritzBox found at 192.168.178.1

Autodiscovery succesful!
-> Device detected at 192.168.178.1.
Providing initramfs and sysupgrade is required for this device
Element not found.

The launch parameters were:

python3 fritzflash.py --image $env:USERPROFILE\Downloads\openwrt-23.05.4-ipq40xx-generic-avm_fritzbox-7530-initramfs-uImage.itb --sysupgrade $env:USERPROFILE\Downloads\avm-fritz-box-7520-sysupgrade.bin