TCP in React Native

node's net API in React Native

Install

• Create a new react-native project. Check react-native getting started

• In your project dir:

npm install @photon-sdk/react-native-tcp --save

if using Cocoapods

Update the following line with your path to node_modules/ and add it to your podfile:

pod 'TcpSockets', :path => '../node_modules/react-native-tcp'

Link in the native dependency

react-native link @photon-sdk/react-native-tcp

Additional dependencies

Due to limitations in the react-native packager, streams need to be hacked in with rn-nodeify

1. install rn-nodeify as a dev-dependency npm install --save-dev rn-nodeify
2. run rn-nodeify manually rn-nodeify --install stream,process,util --hack
3. optionally you can add this as a postinstall script "postinstall": "rn-nodeify --install stream,process,util --hack"

Usage

package.json

only if you want to write require('net') or require('tls') in your javascript

{
  "react-native": {
    "net": "@photon-sdk/react-native-tcp",
    "tls": "@photon-sdk/react-native-tcp/tls"
  }
}

JS

see/run index.ios.js/index.android.js for a complete example, but basically it's just like net

var net = require("net");
var net = require("tls");
// OR, if not shimming via package.json "react-native" field:
// var net = require('@photon-sdk/react-native-tcp')
// var tls = require('@photon-sdk/react-native-tcp/tls')

var server = net
  .createServer(function(socket) {
    socket.write("excellent!");
  })
  .listen(12345);

var client = net.createConnection(12345);

client.on("error", function(error) {
  console.log(error);
});

client.on("data", function(data) {
  console.log("message was received", data);
});

TLS support

TLS is only supported in the client interface. To use TLS, use the tls.connect() syntax and not socket = new tls.Socket() syntax.

const socket = tls.connect({port: 50002, host:'electrum.villocq.com', rejectUnauthorized: false}, () => {
  socket.write('{ "id": 5, "method": "blockchain.estimatefee", "params": [2] }\n')
  console.log('Connected')
})

socket.on('data', (data) => {
  console.log('data:' + data.toString('ascii'))
})