'use strict'
 
const Exchange = require('libp2p-exchange-direct')
 
const exchangeA = new Exchange(swarmA)
const exchangeB = new Exchange(swarmB)
const exchangeM = new Exchange(swarmM, {enableServer: true})
 
exchangeA.start(() => {})
exchangeB.start(() => {})
exchangeM.start(() => {})
 
exchangeB.listen('example', (data, cb) => {
  return cb(null, data.reverse())
})
 
swarmA.dial(swarmM.peerInfo, err => {
  if (err) throw err
 
  swarmB.dial(swarmM.peerInfo, err => {
    if (err) throw err
 
    exchangeA.request(swarmB.peerInfo.id, 'example', Buffer.from('Hello World!'), console.log)
  })
})