Send image data in chunks (ellensp's fix)

[miramiram]

Fix by @ellensp - derkalle4/python3-idotmatrix-client#50 (comment)
It's been many months so I assume they've forgotten to open a PR for it

[ellensp]

no, someone said it didn't work on 64x64 and since I only have access to the 32x32 I could not test, confirm or investigate further

[miramiram]

Oh I see, I don't have one so that's difficult
Though I can't find anyone saying that in the linked thread, did they give any more info?
The person saying they could upload 64x64 gifs but not images didn't mention using the patch

[miramiram]

Also if you wanna open a PR for this yourself so it gets properly attributed I can close this one. There oughta be a PR for it open so there's a place to collaborate on it properly, even if it needs improvements

[ellensp]

I'm good. If you click on my github user name you will find I have some 200 contributions to opensource projects in the last year... I don't' "need" another one :)

[silvioBi]

Hello there, I got a 64x64 screen and for me images are not working and gifs are working only if not above 4KB.
If you tell me how I will be happy to test this out ✌🏼

[ellensp]

@silvioBi
In the above patch data is sent in 512 byte chunks. I suspect the 64x64 doesn't have that much free ram.
Use this patch and try smaller values instead of the 512 in this line

chunks = self._splitIntoChunks(data, 512)

ie try these in turn 256, 128, 64, 32

[miramiram]

Also you might have to give it the "reset" command every now and again when working with files of this size, it seems to reset ram & flash and clear up issues. It's in the client but I can't recall if I added it in the library too, lmk if you don't find it