* Encodes a payload into a Tuya-protocol-complient packet for protocol version 3.4 * @param {Object} options Options for encoding * @param {Buffer|String|Object} options.data data to encode * @param {Boolean} options.encrypted whether or not to encrypt the data * @param {Number} options.
(options)
| 417 | * @returns {Buffer} Encoded Buffer |
| 418 | */ |
| 419 | _encode34(options) { |
| 420 | let payload = options.data; |
| 421 | |
| 422 | if (options.commandByte !== CommandType.DP_QUERY && |
| 423 | options.commandByte !== CommandType.HEART_BEAT && |
| 424 | options.commandByte !== CommandType.DP_QUERY_NEW && |
| 425 | options.commandByte !== CommandType.SESS_KEY_NEG_START && |
| 426 | options.commandByte !== CommandType.SESS_KEY_NEG_FINISH && |
| 427 | options.commandByte !== CommandType.DP_REFRESH) { |
| 428 | // Add 3.4 header |
| 429 | // check this: mqc_very_pcmcd_mcd(int a1, unsigned int a2) |
| 430 | const buffer = Buffer.alloc(payload.length + 15); |
| 431 | Buffer.from('3.4').copy(buffer, 0); |
| 432 | payload.copy(buffer, 15); |
| 433 | payload = buffer; |
| 434 | } |
| 435 | |
| 436 | // ? if (payload.length > 0) { // is null messages need padding - PING work without |
| 437 | const padding = 0x10 - (payload.length & 0xF); |
| 438 | const buf34 = Buffer.alloc((payload.length + padding), padding); |
| 439 | payload.copy(buf34); |
| 440 | payload = buf34; |
| 441 | // } |
| 442 | |
| 443 | payload = this.cipher.encrypt({ |
| 444 | data: payload |
| 445 | }); |
| 446 | |
| 447 | payload = Buffer.from(payload); |
| 448 | |
| 449 | // Allocate buffer with room for payload + 24 bytes for |
| 450 | // prefix, sequence, command, length, crc, and suffix |
| 451 | const buffer = Buffer.alloc(payload.length + 52); |
| 452 | |
| 453 | // Add prefix, command, and length |
| 454 | buffer.writeUInt32BE(0x000055AA, 0); |
| 455 | buffer.writeUInt32BE(options.commandByte, 8); |
| 456 | buffer.writeUInt32BE(payload.length + 0x24, 12); |
| 457 | |
| 458 | if (options.sequenceN) { |
| 459 | buffer.writeUInt32BE(options.sequenceN, 4); |
| 460 | } |
| 461 | |
| 462 | // Add payload, crc, and suffix |
| 463 | payload.copy(buffer, 16); |
| 464 | const calculatedCrc = this.cipher.hmac(buffer.slice(0, payload.length + 16));// & 0xFFFFFFFF; |
| 465 | calculatedCrc.copy(buffer, payload.length + 16); |
| 466 | |
| 467 | buffer.writeUInt32BE(0x0000AA55, payload.length + 48); |
| 468 | return buffer; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * Encodes a payload into a Tuya-protocol-complient packet for protocol version 3.5 |