BUG always using port 47808

[Andrius1008]

Node Version: v14.17.0

Node BACstack Version: 1.0.0

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• Feature Request
• Question

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Feature Request / Question

Current Behaviour (Bug Report)

const bacnetClient = new Bacnet({
port: 47809, // Use BAC1 as communication port
interface: '192.168.222.11', // Listen on a specific interface
broadcastAddress: '192.168.222.255', // Use the subnet broadcast address
apduTimeout: 60000 // Wait twice as long for response
});

currently discovering in port 47808,but in options there is 47809.

So the bug in transport.js Line 100.
this._server.send(buffer, 0, offset, port || DEFAULT_BACNET_PORT , address);

variable "port" is undefined.

Expected Behaviour (Bug Report)

Steps to reproduce Issue (Bug Report)

[Apollon77]

@Andrius1008 Could you prepare a PR?