At the moment, you have to be careful about the maximum message size you can send over a WebRTC data channel. Especially if the data channel has been established between Firefox and Chrome. With help from Randell Jesup, Nils Ohlmeier and plenty of other helpful guys from the #media Mozilla IRC channel, I've added EOR handling and determination of the maximum message size to Firefox data channels. In this article, I'll explain the technical details and the benefits of this addition.

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WebRTC's data channels have a message size limitation. But where does this limitation come from? I've read through most of Firefox's and Chromium's data channel code. In this article, I'll show you my results and give some recommendation what you can do to reliably work around this issue.

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In my bachelor thesis, I'm going through the WebRTC protocol, in particular its weakest link - the Signalling Channel. This work presents a solution that uses the Networking and Cryptography library (NaCl) to provide a secure implementation of the Signalling Channel called SaltyRTC.

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