Transfer byte array from javascript on page to webgl

I've been looking for how to do it for a few days now but only found some old threads which didn't really help.
I receive a BufferArray from my websocket and all I need is somehow to pass the bytes to the game.
From what I read it is possible to only pass nothing, number, and string using unityInstance.Send().

Could somebody help me please, my current very hacky solution is not only ugly but I suspect it also wrangles bytes in some places so my deserialization is inconsistent. For example, I have to double the array size so I can have one half to represent if there is zero because if I try to pass a string as is it terminates at null byte.

I must be missing something.

 

you can try this: https://stackoverflow.com/questions/9267899/arraybuffer-to-base64-encoded-string


unityInstance.SendMessage("GAMEOBJECT", "METHODNAME", bytesString);

and in unity:
byte[] data = System.Convert.FromBase64String(bytesString);

 

Hey thank you for the responce. But won't it terminate at null? I used something similar before and null bytes cut the string short.