knx-listener
Version:
A thin client that creates a tunnel to knx gateway to listen to telegrams within knx net
151 lines • 21.3 kB
JavaScript
;
const smart_cursor_1 = require("./utils/smart-cursor");
function header(service, bodyLength) {
const size = 0x06;
const pos = new smart_cursor_1.SmartCursor();
const raw = Buffer.allocUnsafe(size);
raw.writeUInt8(size, pos.next()); // header length
raw.writeUInt8(0x10, pos.next()); // version
raw.writeUInt16BE(service, pos.next(2)); // service type
raw.writeUInt16BE(size + bodyLength, pos.next(2)); // total length
return raw;
}
;
function message(service, includes) {
const size = includes.reduce((acc, item) => acc += item.length, 0);
const head = header(service, size);
const ret = Buffer.concat([head, ...includes]);
return ret;
}
;
function hpai(protocol, ip, port) {
const size = 0x08;
const pos = new smart_cursor_1.SmartCursor();
const raw = Buffer.allocUnsafe(size);
raw.writeUInt8(size, pos.next()); // structure length
raw.writeUInt8(protocol, pos.next()); // protocol
raw.writeUInt32BE(ip, pos.next(4)); // ip
raw.writeUInt16BE(port, pos.next(2)); // port
return raw;
}
;
function tunneling() {
const size = 0x04;
const pos = new smart_cursor_1.SmartCursor();
const raw = Buffer.allocUnsafe(size);
raw.writeUInt8(size, pos.next()); // structure length
raw.writeUInt8(0x04, pos.next()); // TUNNEL_CONNECTION
raw.writeUInt8(0x02, pos.next()); // TUNNEL_LINKLAYER
raw.writeUInt8(0x00, pos.next()); // reserved
return raw;
}
;
function channel(channelId) {
const pos = new smart_cursor_1.SmartCursor();
const raw = Buffer.allocUnsafe(2);
raw.writeUInt8(channelId, pos.next());
raw.writeUInt8(0x00, pos.next()); // reserved
return raw;
}
;
/**
* Creates buffer of sequence counter, channel id and status code
*/
function seqnum(seqn, channelId, status = 0x00) {
const size = 0x04;
const pos = new smart_cursor_1.SmartCursor();
const raw = Buffer.allocUnsafe(size);
raw.writeUInt8(size, pos.next()); // structure length
raw.writeUInt8(channelId, pos.next()); // channelId
raw.writeUInt8(seqn, pos.next()); // sequenceCounter
raw.writeUInt8(status, pos.next()); // reserved or status
return raw;
}
;
// ready to use messages
function ack(seqn, channelId, status) {
return message(1057 /* TunnelingAck */, [
seqnum(seqn, channelId, status),
]);
}
exports.ack = ack;
;
function disconnect(channelId, respondTo) {
return message(521 /* DisconnectRequest */, [
channel(channelId),
hpai(respondTo.protocol, respondTo.ip, respondTo.port),
]);
}
exports.disconnect = disconnect;
;
function ping(channelId, respondTo) {
return message(519 /* ConnectionStateRequest */, [
channel(channelId),
hpai(respondTo.protocol, respondTo.ip, respondTo.port),
]);
}
exports.ping = ping;
;
function openTunnel({ receiveAt, respondTo }) {
return message(517 /* ConnectRequest */, [
hpai(respondTo.protocol, respondTo.ip, respondTo.port),
hpai(receiveAt.protocol, receiveAt.ip, receiveAt.port),
tunneling(),
]);
}
exports.openTunnel = openTunnel;
;
function write({ data, seqn, channelId, source, dest }) {
if (data.length > 16 /* Uint128 */) {
// if data is longer than 16 bytes
throw new Error(`Data is too long, expected maximum ${16 /* Uint128 */} bytes, got ${data.length}`);
}
// cemi
const isUint6 = data.length === 1 /* Uint8 */ && data[0] <= 0x3f;
const size = isUint6 ? 1 /* Uint8 */ : data.length + 1;
const pos = new smart_cursor_1.SmartCursor();
const cemi = Buffer.alloc(0x0A + size);
cemi.writeUInt8(0x11, pos.next()); // L_Data_req
cemi.writeUInt8(0x00, pos.next()); // additional info length
cemi.writeUInt8(0xbc, pos.next()); // control field 1
cemi.writeUInt8(0xe0, pos.next()); // control field 2
cemi.writeUInt16BE(source, pos.next(2)); // source address 0.0.0
cemi.writeUInt16BE(dest, pos.next(2)); // destination address
if (isUint6) {
// data can be merged
cemi.writeUInt8(size, pos.next()); // payload length
cemi.writeUInt16BE(data[0] | 0x80, pos.next(2)); // 0x80 GROUPVALUE_WRITE
}
else {
// data must be appended at the end
cemi.writeUInt8(size, pos.next()); // payload length
cemi.writeUInt16BE(0x80, pos.next(2)); // apci 0x80 GROUPVALUE_WRITE
cemi.set(data, pos.next(size));
}
return message(1056 /* TunnelingRequest */, [
seqnum(seqn, channelId),
cemi,
]);
}
exports.write = write;
;
function read(params) {
// cemi
const pos = new smart_cursor_1.SmartCursor();
const cemi = Buffer.alloc(0x0B);
cemi.writeUInt8(0x11, pos.next()); // L_Data_req
cemi.writeUInt8(0x00, pos.next()); // additional info length
cemi.writeUInt8(0xbc, pos.next()); // control field 1
cemi.writeUInt8(0xe0, pos.next()); // control field 2
cemi.writeUInt16BE(params.source, pos.next(2)); // source address 0.0.0
cemi.writeUInt16BE(params.dest, pos.next(2)); // destination address
cemi.writeUInt8(0x01, pos.next()); // payload length
cemi.writeUInt16BE(0x00, pos.next(2)); // 0x00 GROUPVALUE_READ
return message(1056 /* TunnelingRequest */, [
seqnum(params.seqn, params.channelId),
cemi,
]);
}
exports.read = read;
;
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{\n  SmartCursor,\n} from './utils/smart-cursor';\nimport {\n  Service,\n} from './constants';\nimport {\n  Hpai,\n} from './interfaces';\n\nfunction header(service: Service, bodyLength: number) {\n  const size = 0x06;\n  const pos = new SmartCursor();\n  const raw = Buffer.allocUnsafe(size);\n  raw.writeUInt8(size, pos.next()); // header length\n  raw.writeUInt8(0x10, pos.next()); // version\n  raw.writeUInt16BE(service, pos.next(2)); // service type\n  raw.writeUInt16BE(size + bodyLength, pos.next(2)); // total length\n  return raw;\n};\n\nfunction message(service: Service, includes: Buffer[]) {\n  const size = includes.reduce((acc, item) => acc += item.length, 0);\n  const head = header(service, size);\n  const ret = Buffer.concat([head, ...includes]);\n  return ret;\n};\n\nfunction hpai(protocol: number, ip: number, port: number) {\n  const size = 0x08;\n  const pos = new SmartCursor();\n  const raw = Buffer.allocUnsafe(size);\n  raw.writeUInt8(size, pos.next()); // structure length\n  raw.writeUInt8(protocol, pos.next()); // protocol\n  raw.writeUInt32BE(ip, pos.next(4)); // ip\n  raw.writeUInt16BE(port, pos.next(2)); // port\n  return raw;\n};\n\nfunction tunneling() {\n  const size = 0x04;\n  const pos = new SmartCursor();\n  const raw = Buffer.allocUnsafe(size);\n  raw.writeUInt8(size, pos.next()); // structure length\n  raw.writeUInt8(0x04, pos.next()); // TUNNEL_CONNECTION\n  raw.writeUInt8(0x02, pos.next()); // TUNNEL_LINKLAYER\n  raw.writeUInt8(0x00, pos.next()); // reserved\n  return raw;\n};\n\nfunction channel(channelId: number) {\n  const pos = new SmartCursor();\n  const raw = Buffer.allocUnsafe(2);\n  raw.writeUInt8(channelId, pos.next());\n  raw.writeUInt8(0x00, pos.next()); // reserved\n  return raw;\n};\n\n/**\n * Creates buffer of sequence counter, channel id and status code\n */\nfunction seqnum(seqn: number, channelId: number, status = 0x00) {\n  const size = 0x04;\n  const pos = new SmartCursor();\n  const raw = Buffer.allocUnsafe(size);\n  raw.writeUInt8(size, pos.next()); // structure length\n  raw.writeUInt8(channelId, pos.next()); // channelId\n  raw.writeUInt8(seqn, pos.next()); // sequenceCounter\n  raw.writeUInt8(status, pos.next()); // reserved or status\n  return raw;\n};\n\nexport const enum DataType {\n  Uint8 = 1,\n  Uint16 = 2,\n  Uint32 = 4,\n  Uint64 = 8,\n  Uint128 = 16,\n}\n\n// ready to use messages\n\nexport function ack(seqn: number, channelId: number, status: number) {\n  return message(Service.TunnelingAck, [\n    seqnum(seqn, channelId, status),\n  ]);\n};\n\nexport function disconnect(channelId: number, respondTo: Hpai) {\n  return message(Service.DisconnectRequest, [\n    channel(channelId),\n    hpai(respondTo.protocol, respondTo.ip, respondTo.port),\n  ]);\n};\n\nexport function ping(channelId: number, respondTo: Hpai) {\n  return message(Service.ConnectionStateRequest, [\n    channel(channelId),\n    hpai(respondTo.protocol, respondTo.ip, respondTo.port),\n  ]);\n};\n\nexport function openTunnel({ receiveAt, respondTo }: {\n  respondTo: Hpai;\n  receiveAt: Hpai;\n}) {\n  return message(Service.ConnectRequest, [\n    hpai(respondTo.protocol, respondTo.ip, respondTo.port),\n    hpai(receiveAt.protocol, receiveAt.ip, receiveAt.port),\n    tunneling(),\n  ]);\n};\n\nexport function write({ data, seqn, channelId, source, dest }: {\n  data: Buffer | Uint8Array | number[];\n  seqn: number;\n  channelId: number;\n  source: number;\n  dest: number;\n}) {\n  if (data.length > DataType.Uint128) {\n    // if data is longer than 16 bytes\n    throw new Error(\n      `Data is too long, expected maximum ${DataType.Uint128} bytes, got ${data.length}`);\n  }\n  // cemi\n  const isUint6 = data.length === DataType.Uint8 && data[0] <= 0x3f;\n  const size = isUint6 ? DataType.Uint8 : data.length + 1;\n  const pos = new SmartCursor();\n  const cemi = Buffer.alloc(0x0A + size);\n  cemi.writeUInt8(0x11, pos.next()); // L_Data_req\n  cemi.writeUInt8(0x00, pos.next()); // additional info length\n  cemi.writeUInt8(0xbc, pos.next()); // control field 1\n  cemi.writeUInt8(0xe0, pos.next()); // control field 2\n  cemi.writeUInt16BE(source, pos.next(2)); // source address 0.0.0\n  cemi.writeUInt16BE(dest, pos.next(2)); // destination address\n  if (isUint6) {\n    // data can be merged\n    cemi.writeUInt8(size, pos.next()); // payload length\n    cemi.writeUInt16BE(data[0] | 0x80, pos.next(2)); // 0x80 GROUPVALUE_WRITE\n  } else {\n    // data must be appended at the end\n    cemi.writeUInt8(size, pos.next()); // payload length\n    cemi.writeUInt16BE(0x80, pos.next(2)); // apci 0x80 GROUPVALUE_WRITE\n    cemi.set(data, pos.next(size));\n  }\n  return message(Service.TunnelingRequest, [\n    seqnum(seqn, channelId),\n    cemi,\n  ]);\n};\n\nexport function read(params: {\n  seqn: number;\n  channelId: number;\n  source: number;\n  dest: number;\n}) {\n  // cemi\n  const pos = new SmartCursor();\n  const cemi = Buffer.alloc(0x0B);\n  cemi.writeUInt8(0x11, pos.next()); // L_Data_req\n  cemi.writeUInt8(0x00, pos.next()); // additional info length\n  cemi.writeUInt8(0xbc, pos.next()); // control field 1\n  cemi.writeUInt8(0xe0, pos.next()); // control field 2\n  cemi.writeUInt16BE(params.source, pos.next(2)); // source address 0.0.0\n  cemi.writeUInt16BE(params.dest, pos.next(2)); // destination address\n  cemi.writeUInt8(0x01, pos.next()); // payload length\n  cemi.writeUInt16BE(0x00, pos.next(2)); // 0x00 GROUPVALUE_READ\n  return message(Service.TunnelingRequest, [\n    seqnum(params.seqn, params.channelId),\n    cemi,\n  ]);\n};\n"]}