Discovery: react-native-tcp doesn't support server.listen(1234), only supports server.listen(opts), while multiserver net plugin uses server.listen(port). I'll make a PR to react-native-tcp.

https://github.com/PeelTechnologies/react-native-tcp/blob/75afd35a6b2c1ce13dea74da236d75b6bfdcff0c/TcpServer.js#L66
https://github.com/ssbc/multiserver/blob/58073dc0fc7bed93460b3fa718d3114dc2d4ec3e/plugins/net.js#L21