Yesterday Dominic and I did some pair programming to troubleshoot the bug. We ended up finding two bugs, one in secret-handshake/protocol, the other in tweetnacl. None of these were "our bug" though, so we didn't solve the problem. There are two vectors now: (1) try to reproduce the bug by making a smaller project with React Native, react-native-tcp and pull streams, to see if the interop between these parts has a problem, (2) use websockets instead of TCP. Web Sockets are supported in React Native even without a polyfill library to separately install.