Module @libp2p/dcutr

Example

import { createLibp2p } from 'libp2p'
import { circuitRelayTransport } from '@libp2p/circuit-relay-v2'
import { tcp } from '@libp2p/tcp'
import { identify } from '@libp2p/identify'
import { dcutr } from '@libp2p/dcutr'
import { multiaddr } from '@multiformats/multiaddr'

const node = await createLibp2p({
  transports: [
    circuitRelayTransport(),
    tcp()
  ],
  services: {
    identify: identify(),
    dcutr: dcutr()
  }
})

// QmTarget is a peer that is behind a NAT, supports TCP and has a relay
// reservation
const ma = multiaddr('/ip4/.../p2p/QmRelay/p2p-circuit/p2p/QmTarget')
await node.dial(ma)

// after a while the connection should automatically get upgraded to a
// direct connection (e.g. non-limited)
while (true) {
  const connections = node.getConnections()

  if (connections.find(conn => conn.limits == null)) {
    console.info('have direct connection')
    break
  } else {
    console.info('have relayed connection')

    // wait a few seconds to see if it's succeeded yet
    await new Promise<void>((resolve) => {
      setTimeout(() => resolve(), 5000)
    })
  }
}
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