zigbee-herdsman
Version:
An open source ZigBee gateway solution with node.js.
101 lines • 3.12 kB
JavaScript
;
/* v8 ignore start */
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Frame = exports.FrameType = void 0;
const consts_1 = require("./consts");
const crc16ccitt_1 = __importDefault(require("./utils/crc16ccitt"));
var FrameType;
(function (FrameType) {
FrameType[FrameType["UNKNOWN"] = 0] = "UNKNOWN";
FrameType[FrameType["ERROR"] = 1] = "ERROR";
FrameType[FrameType["DATA"] = 2] = "DATA";
FrameType[FrameType["ACK"] = 3] = "ACK";
FrameType[FrameType["NAK"] = 4] = "NAK";
FrameType[FrameType["RST"] = 5] = "RST";
FrameType[FrameType["RSTACK"] = 6] = "RSTACK";
})(FrameType || (exports.FrameType = FrameType = {}));
/**
* Basic class to handle uart-level frames
* https://www.silabs.com/documents/public/user-guides/ug101-uart-gateway-protocol-reference.pdf
*/
class Frame {
/**
* Type of the Frame as determined by its control byte.
*/
type;
buffer;
constructor(buffer) {
this.buffer = buffer;
const ctrlByte = this.buffer[0];
if ((ctrlByte & 0x80) === 0) {
this.type = FrameType.DATA;
}
else if ((ctrlByte & 0xe0) === 0x80) {
this.type = FrameType.ACK;
}
else if ((ctrlByte & 0xe0) === 0xa0) {
this.type = FrameType.NAK;
}
else if (ctrlByte === 0xc0) {
this.type = FrameType.RST;
}
else if (ctrlByte === 0xc1) {
this.type = FrameType.RSTACK;
}
else if (ctrlByte === 0xc2) {
this.type = FrameType.ERROR;
}
else {
this.type = FrameType.UNKNOWN;
}
}
get control() {
return this.buffer[0];
}
static fromBuffer(buffer) {
return new Frame(buffer);
}
/**
* XOR s with a pseudo-random sequence for transmission.
* Used only in data frames.
*/
static makeRandomizedBuffer(buffer) {
let rand = consts_1.RANDOMIZE_START;
const out = Buffer.alloc(buffer.length);
let outIdx = 0;
for (const c of buffer) {
out.writeUInt8(c ^ rand, outIdx++);
if (rand % 2) {
rand = (rand >> 1) ^ consts_1.RANDOMIZE_SEQ;
}
else {
rand = rand >> 1;
}
}
return out;
}
/**
* Throws on CRC error.
*/
checkCRC() {
const crc = (0, crc16ccitt_1.default)(this.buffer.subarray(0, -3), 65535);
const crcArr = Buffer.from([crc >> 8, crc % 256]);
const subArr = this.buffer.subarray(-3, -1);
if (!subArr.equals(crcArr)) {
throw new Error(`<-- CRC error: ${this.toString()}|${subArr.toString("hex")}|${crcArr.toString("hex")}`);
}
}
/**
*
* @returns Buffer to hex string
*/
toString() {
return this.buffer.toString("hex");
}
}
exports.Frame = Frame;
exports.default = Frame;
//# sourceMappingURL=frame.js.map