Hello @Helen, the topic of communication in the Autonomi network has been occupying me for a long time, and the community has already approached this topic many times 
I am glad that you have taken up the topic anew with the very interesting proposal of the Trystero system.
After my various thoughts and analyses of instant messaging, I focused on the SimpleX Chat solution, which I recognised in more depth last year, and as @Southside mentioned was also being tested by some of us. Last year I posted a thread in which I think I went a bit overboard 
but perhaps some of the information will be useful to you:
Among the many solutions, SimpleX seems to me much more dedicated to Web3 than the others, and it is very close to Autonomi in concept, which, apart from the technological differences, could be very conducive to integration or implementation. I would love to know your opinion 
Trystero is very interesting for its lightness, direct communication with low latency and efficient data transfer, but the poor metadata protection and possible communication problems if the connected devices are behind NAT or a restrictive firewall seem to be major drawbacks.
If communication is to be as private and secure as data storage in Autonomi, SimpleX Chat is, in my opinion, the best candidate for today.