knxultimate
Version:
KNX IP protocol implementation for Node. This is the ENGINE of Node-Red KNX-Ultimate node.
52 lines • 2.06 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const KNXPacket_1 = __importDefault(require("./KNXPacket"));
const KNXConstants_1 = require("./KNXConstants");
const CEMIFactory_1 = __importDefault(require("./cEMI/CEMIFactory"));
class KNXTunnelingRequest extends KNXPacket_1.default {
constructor(channelID, seqCounter, cEMIMessage) {
super(KNXConstants_1.KNX_CONSTANTS.TUNNELING_REQUEST, 4 + cEMIMessage.length);
this.channelID = channelID;
this.seqCounter = seqCounter;
this.cEMIMessage = cEMIMessage;
}
static parseCEMIMessage(buffer, offset) {
if (offset > buffer.length) {
throw new Error('Buffer too short');
}
const msgCode = buffer.readUInt8(offset++);
return CEMIFactory_1.default.createFromBuffer(msgCode, buffer, offset);
}
static createFromBuffer(buffer, offset = 0) {
if (offset >= buffer.length) {
throw new Error('Buffer too short');
}
const structureLength = buffer.readUInt8(offset);
if (offset + structureLength > buffer.length) {
throw new Error('Buffer too short');
}
offset += 1;
const channelID = buffer.readUInt8(offset++);
const seqCounter = buffer.readUInt8(offset++);
offset++;
const cEMIMessage = this.parseCEMIMessage(buffer, offset);
return new KNXTunnelingRequest(channelID, seqCounter, cEMIMessage);
}
toBuffer() {
const buffer = Buffer.alloc(4);
buffer.writeUInt8(4, 0);
buffer.writeUInt8(this.channelID, 1);
buffer.writeUInt8(this.seqCounter, 2);
buffer.writeUInt8(0, 3);
return Buffer.concat([
this.header.toBuffer(),
buffer,
this.cEMIMessage.toBuffer(),
]);
}
}
exports.default = KNXTunnelingRequest;
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