@Override
  // Returned string is sanitized since it contains user input
  public String toString() {
    final StringBuilder sb = new StringBuilder("PeerInfo{");
    sb.append("version=").append(version);
    sb.append(", clientId='").append(Encode.forJava(clientId)).append('\'');
    sb.append(", capabilities=").append(capabilities);
    sb.append(", port=").append(port);
    sb.append(", nodeId=").append(nodeId);
    sb.append('}');
    return sb.toString();
  }
This value is meant to represent the port at which a peer is listening for connections. A value
of zero means the peer is not listening for incoming connections.

@return The tcp port on which the peer is listening for connections, 0 indicates the peer is
    not listening for connections.
ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/rlpx/wire/PeerInfo.java