knxultimate/src/protocol/KNXConnectRequest.ts

KNX IP protocol implementation for Node. This is the ENGINE of Node-Red KNX-Ultimate node.

import KNXPacket from './KNXPacket'
import HPAI from './HPAI'
import CRIFactory from './CRIFactory'
import { KNX_CONSTANTS } from './KNXConstants'
import TunnelCRI from './TunnelCRI'

export default class KNXConnectRequest extends KNXPacket {
	cri: TunnelCRI

	hpaiControl: HPAI

	hpaiData: HPAI

	constructor(
		cri: TunnelCRI,
		hpaiControl = HPAI.NULLHPAI,
		hpaiData = HPAI.NULLHPAI,
	) {
		super(
			KNX_CONSTANTS.CONNECT_REQUEST,
			hpaiControl.length + hpaiData.length + cri.length,
		)
		this.cri = cri
		this.hpaiControl = hpaiControl
		this.hpaiData = hpaiData
	}

	static createFromBuffer(
		buffer: Buffer,
		offset: number = 0,
	): KNXConnectRequest {
		if (offset >= buffer.length) {
			throw new Error('Buffer too short')
		}
		const hpaiControl = HPAI.createFromBuffer(buffer, offset)
		offset += hpaiControl.length
		const hpaiData = HPAI.createFromBuffer(buffer, offset)
		offset += hpaiData.length
		const cri = CRIFactory.createFromBuffer(buffer, offset)
		return new KNXConnectRequest(cri, hpaiControl, hpaiData)
	}

	toBuffer(): Buffer {
		return Buffer.concat([
			this.header.toBuffer(),
			this.hpaiControl.toBuffer(),
			this.hpaiData.toBuffer(),
			this.cri.toBuffer(),
		])
	}
}