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ESP3Parser.js
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ESP3Parser.js
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/* jslint node: true */
'use strict'
// Copyright 2015 Rafael Kähm <rafael@kaehms.de>
// Copyright 2018 Holger Will <h.will@klimapartner.de>
const Transform = require('stream').Transform
const Packets = require('./Packet')
// Emit a data event by recognizing ESP3 packets
// Data contains ESP3Packet
// More: https://www.enocean.com/fr/knowledge-base-doku/enoceansystemspecification:issue:faqesp2esp3/?purge=1
class ESP3Parser extends Transform {
constructor (options = {}) {
super({ ...options, ...{ readableObjectMode: true } })
this.currentESP3Packet = new Packets.ESP3Packet()
this.tmp = null
this.callbackForNextByte = this.waitForSyncByte
}
_transform (chunk, encoding, cb) {
for (var offset = 0; offset < chunk.length; offset++) {
this.callbackForNextByte(chunk[offset])
}
cb()
}
waitForSyncByte (byte) {
if (byte !== 0x55) {
return
}
this.tmp = {
'header': Buffer.alloc(4),
'headerOffset': 0,
'dataOffset': 0,
'optionalDataOffset': 0
}
this.currentESP3Packet = new Packets.ESP3Packet()
this.callbackForNextByte = this.fillHeader
}
fillHeader (byte) {
if (this.tmp.headerOffset < 3) {
this.tmp.header.fill(byte, this.tmp.headerOffset)
this.tmp.headerOffset++
return
}
this.tmp.header.fill(byte, this.tmp.headerOffset)
this.currentESP3Packet.header.dataLength = Buffer.from([this.tmp.header[0], this.tmp.header[1]]).readUInt16BE(0)
this.currentESP3Packet.header.optionalLength = this.tmp.header[2]
this.currentESP3Packet.header.packetType = this.tmp.header[3]
this.callbackForNextByte = this.fetchCRC8ForHeaderAndCheck
}
fetchCRC8ForHeaderAndCheck (byte) {
if (this.getCrc8(this.tmp.header) !== byte) {
this.callbackForNextByte = this.waitForSyncByte
this.emit('error', {
code: 1,
name: 'WRONG_HEADER_CHECKSUM',
desc: 'header checksum test failed'
})
return
}
this.currentESP3Packet.crc8Header = byte
this.currentESP3Packet.data = Buffer.alloc(this.currentESP3Packet.header.dataLength)
// @todo: is 0 bytes buffer really needed? -> maybe "if (currentESP3Packet.header.optionalLength > 0)"?
this.currentESP3Packet.optionalData = Buffer.alloc(this.currentESP3Packet.header.optionalLength)
this.callbackForNextByte = this.fillData
}
fillData (byte) {
if (this.tmp.dataOffset < this.currentESP3Packet.header.dataLength - 1) {
this.currentESP3Packet.data.fill(byte, this.tmp.dataOffset)
this.tmp.dataOffset++
return
}
this.currentESP3Packet.data.fill(byte, this.tmp.dataOffset)
if (this.currentESP3Packet.header.optionalLength > 0) {
this.callbackForNextByte = this.fillOptionalData
return
}
this.callbackForNextByte = this.fetchCRC8ForDataAndCheck
}
fillOptionalData (byte) {
if (this.tmp.optionalDataOffset < this.currentESP3Packet.header.optionalLength - 1) {
this.currentESP3Packet.optionalData.fill(byte, this.tmp.optionalDataOffset)
this.tmp.optionalDataOffset++
return
}
this.currentESP3Packet.optionalData.fill(byte, this.tmp.optionalDataOffset)
this.callbackForNextByte = this.fetchCRC8ForDataAndCheck
}
fetchCRC8ForDataAndCheck (byte) {
this.callbackForNextByte = this.waitForSyncByte
var datas = Buffer.concat(
[this.currentESP3Packet.data, this.currentESP3Packet.optionalData],
(this.currentESP3Packet.header.dataLength + this.currentESP3Packet.header.optionalLength)
)
if (this.getCrc8(datas) !== byte) {
this.emit('error', {
code: 2,
name: 'WRONG_BODY_CHECKSUM',
desc: 'data checksum test failed'
})
return
}
this.currentESP3Packet.crc8Data = byte
this._flush()
}
getCrc8 (buffer) {
var u8CRC8Table = [
0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 0x76, 0x71, 0x78, 0x7f, 0x6A, 0x6d, 0x64, 0x63,
0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8D, 0x84, 0x83,
0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
]
var crc8 = 0
for (var i = 0; i < buffer.length; i++) {
crc8 = u8CRC8Table[(crc8 ^ buffer[i])]
}
return crc8
}
_flush () {
this.push(this.currentESP3Packet)
this.currentESP3Packet = new Packets.ESP3Packet()
}
}
class ESP3FullParser extends ESP3Parser {
_flush () {
switch (this.currentESP3Packet.header.packetType) {
case 1:
this.currentESP3Packet = new Packets.RadioERP1(this.currentESP3Packet)
break
case 2:
this.currentESP3Packet = new Packets.Response(this.currentESP3Packet)
break
case 3:
this.currentESP3Packet = new Packets.RadioSubTel(this.currentESP3Packet)
break
case 4:
this.currentESP3Packet = new Packets.Event(this.currentESP3Packet)
break
case 5:
this.currentESP3Packet = new Packets.CommonCommand(this.currentESP3Packet)
break
case 6:
this.currentESP3Packet = new Packets.SmartAckCommand(this.currentESP3Packet)
break
case 7:
this.currentESP3Packet = new Packets.RemoteManCommand(this.currentESP3Packet)
break
case 9:
this.currentESP3Packet = new Packets.RadioMessage(this.currentESP3Packet)
break
case 10:
this.currentESP3Packet = new Packets.RadioERP2(this.currentESP3Packet)
break
case 16:
this.currentESP3Packet = new Packets.Radio802(this.currentESP3Packet)
break
case 17:
this.currentESP3Packet = new Packets.Command24(this.currentESP3Packet)
break
}
this.push(this.currentESP3Packet)
this.currentESP3Packet = new Packets.ESP3Packet()
}
}
module.exports = {
SimpleParser: ESP3Parser,
FullParser: ESP3FullParser
}