Nice guide. In contrast to what the article says about data channel size limitations (1200 bytes), 16 KiB seems to be safe: https://lgrahl.de/articles/demystifying-webrtc-dc-size-limit...

In case you want to do chunked data channel transfers but don't want to implement the chunking yourself, I wrote a library to do just that: https://www.npmjs.com/package/@saltyrtc/chunked-dc It's based on this specification: https://github.com/saltyrtc/saltyrtc-meta/blob/master/Chunki...