Allow sending large files about threema-web

[lgrahl]

High on my to do list. 😝

[lgrahl]

This is really annoying to fix as well as the data channel API is just so clunky. We have a low water mark event which will tell us when to unpause sending but there's no high water mark event which tells us when to pause sending. The spec says that send should throw an OperationError in case no buffer space is available. But as far as I can recall, Chrome just closes the data channel and Firefox endlessly buffers your data until you're OOM (which isn't optimal either because of backpressure but it's fine for our use case). Other than that, the buffered amount low event only raises if the buffer is completely empty in Chrome-based implementations. This means, sending will slow start again and has other issues which are a throughput killer, see sctplab/usrsctp#142.

[ovalseven8]

Is there any ETA? When I like to send a video that's usually not possible because of this 15 MiB limit.

[dbrgn]

I'm also annoyed by this every once in a while, so it's definitely on our list of planned things to do :)