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process.env.UV_THREADPOOL_SIZE = (process.env.UV_THREADPOOL_SIZE || 4) + 3;
const stream = require('stream'),
crypto = require('crypto'),
{ transaction } = require('objection'),
aw = require('awaitify-stream'),
lora_packet = require('lora-packet'),
PROTOCOL_VERSION = 2,
pkts = {
PUSH_DATA: 0,
PUSH_ACK: 1,
PULL_DATA: 2,
PULL_RESP: 3,
PULL_ACK: 4,
TX_ACK: 5
};
async function wait_for(link, pkt)
{
while (true)
{
const data = await link.readAsync();
if (data === null)
{
return null;
}
if ((data.length >= 4) &&
(data[0] === PROTOCOL_VERSION) &&
(data[3] === pkt))
{
return data;
}
}
}
/**
* Creates a Duplex stream (in object mode) which reads and writes to a LoRa radio
* link.
*
* It can perform over-the-air activation of devices it knows about on behalf
* of your application.
*
* Messages received from the radio link are made available to read from the
* Duplex and have the following properties:
*
* - `nwk_addr (Buffer)` - Unique network address of the sending device.
* - `dev_eui (Buffer)` - Unique global device identifier (IEEE EUI64) of the sending device.
* - `dev_addr (Buffer)` - Combined identifier of your network (7 most significant bits) and the unique network address of the sending device (i.e. `nwk_addr`, 25 least significant bits).
* - `payload (Buffer)` - The data which the sending device sent to your application.
* - `msg (Object)` - The raw packet received by {@link https://github.com/davedoesdev/packet_forwarder_shared|packet_forwarder_shared}. The format is described {@link https://github.com/davedoesdev/packet_forwarder_shared/blob/master/PROTOCOL.TXT|here}.
* - `packet (Object)` - The decoded packet. Anthony Kirby's excellent {@link https://github.com/anthonykirby/lora-packet|lora-packet} is used to do the decoding.
* - `reply (Object)` - This contains nearly everything needed to reply to the message. Your application just has to set the payload.
* - `header (Object)` - The metadata required by {@link https://github.com/davedoesdev/packet_forwarder_shared|packet_forwarder_shared} to send the reply. See section 6 of {@link https://github.com/davedoesdev/packet_forwarder_shared/blob/master/PROTOCOL.TXT|here}.
* - `encoding (Object)` - The fields required by {@link https://github.com/anthonykirby/lora-packet#fromfieldsdata|lora-packet} to encode the reply.
* - `payload (undefined)` - Your application must set this property to a Buffer containing the data you want to send back to the device.
*
* If your application wants to reply to the message, set `reply.payload` to
* the data that should be sent and then write `reply` to the Duplex.
*
* @param {class} Model - The {@link https://vincit.github.io/objection.js/#models|Objection.js Model class}, or a subclass of it, already {@link https://vincit.github.io/objection.js/#knex|configured for your database using Knex.js}.
* @param {stream.Duplex} uplink - {@link https://rawgit-gjgjyaqiln.now.sh/davedoesdev/node-lora-comms/master/docs/index.html#lora-commsuplink|lora-comms uplink stream}. Your application must {@link https://rawgit-gjgjyaqiln.now.sh/davedoesdev/node-lora-comms/master/docs/index.html#lora-commsstart|start} the {@link https://github.com/davedoesdev/node-lora-comms|lora-comms} module first and then retrieve the uplink.
* @param {stream.Duplex} downlink - {@link https://rawgit-gjgjyaqiln.now.sh/davedoesdev/node-lora-comms/master/docs/index.html#lora-commsdownlink|lora-comms downlink stream}. Your application must {@link https://rawgit-gjgjyaqiln.now.sh/davedoesdev/node-lora-comms/master/docs/index.html#lora-commsstart|start} the {@link https://github.com/davedoesdev/node-lora-comms|lora-comms} module first and then retrieve the downlink.
* @param {Object} options - Configuration options.
* @param {Buffer} options.appid - 8-byte identifier of your application in the IEEE EUI64 address space. This is also known as the AppEUI and your OTAA devices must use the same value.
* @param {Buffer} options.netid - 3-byte identifier of your network. The 7 least significant bits must be unique for neighbouring or overlapping networks.
*/
class Link extends stream.Duplex
{
constructor(Model, uplink, downlink, options)
{
// options.appid = AppEUI
// options.netid = NetId: NwkID (7 LSB), rest chosen by network operator
// Private NwkId: 000000 or 000001
super(Object.assign({}, options, { objectMode: true }));
this._options = Object.assign(
{
// RX1 data rate offset. Just subtracts (see below for data rates).
// See section 7.1.7 of LoRaWAN spec.
RX1DRoffset: 0,
// RX2 data rate. Region-specific. EU:
// 0 SF12 / 125kHz
// 1 SF11 / 125kHz
// 2 SF10 / 125kHz
// 3 SF9 / 125kHz
// 4 SF8 / 125kHz
// 5 SF7 / 125kHz
// 6 SF7 / 250kHz
// 7 FSK: 50kbps
// 8-15 RFU
RX2DataRate: 0,
// RxDelay:
// 7-4 RFU
// 3-0 Delay in seconds
RXDelay: 1,
FCntDownMax: 0xffff
}, options);
this._knex = Model.knex();
this._ABPDevices = class extends Model {
static get tableName() { return 'ABPDevices'; };
static get idColumn() { return 'DevAddr'; };
};
this._OTAADevices = class extends Model {
static get tableName() { return 'OTAADevices'; };
static get idColumn() { return 'NwkAddr'; };
};
this._OTAAHistory = class extends Model {
static get tableName() { return 'OTAAHistory'; };
static get idColumn() { return ['DevEUI', 'DevNonce']; };
};
this._pending = [];
this._reading = false;
downlink.on('finish', () =>
{
this.end();
});
this._uplink_out = aw.createWriter(uplink);
this._downlink_out = aw.createWriter(downlink);
let received_first_pull_data = false;
const ack = (data, _, cb) =>
{
(async () =>
{
if ((data.length >= 4) && (data[0] === PROTOCOL_VERSION))
{
const type = data[3];
if (type === pkts.PUSH_DATA)
{
await this._uplink_out.writeAsync(Buffer.concat([
data.slice(0, 3),
Buffer.from([pkts.PUSH_ACK])]));
}
else if (type === pkts.PULL_DATA)
{
await this._downlink_out.writeAsync(Buffer.concat([
data.slice(0, 3),
Buffer.from([pkts.PULL_ACK])]));
// We want to handle further PULL_DATA messages without
// the application having to read from downlink.
setImmediate(() => this._downlink_in.stream.read(0));
if (received_first_pull_data)
{
return cb();
}
received_first_pull_data = true;
}
}
cb(null, data);
})();
};
this._uplink_in = aw.createReader(uplink.pipe(
new stream.Transform({
transform: ack,
highWaterMark: 0,
objectMode: true
})));
this._downlink_in = aw.createReader(downlink.pipe(
new stream.Transform({
transform: ack,
highWaterMark: 0,
objectMode: true
})));
(async () =>
{
try
{
await wait_for(this._downlink_in, pkts.PULL_DATA);
this.emit('ready');
}
catch (ex)
{
process.nextTick(() => this.emit('error', ex));
}
})();
}
_read()
{
if (this._reading) { return; }
this._reading = true;
(async () =>
{
try
{
while (true)
{
// Process each message we last read
let msg;
while ((msg = this._pending.shift()) !== undefined)
{
// Decode message data
const data = Buffer.from(msg.data, 'base64');
const decoded = lora_packet.fromWire(data);
// OTAA join
if (decoded.isJoinRequestMessage())
{
await this._join(msg, decoded);
}
// Data
else if (decoded.isDataMessage() &&
(decoded.getDir() === 'up') &&
!await this._data(msg, decoded))
{
return;
}
}
// Read incoming packet
const packet = await wait_for(this._uplink_in, pkts.PUSH_DATA);
if (packet === null)
{
return this.push(null);
}
// Parse packet data (JSON-encoded by shared pkt forwarder)
const payload = JSON.parse(packet.slice(12));
if (payload.rxpk)
{
this._pending = payload.rxpk;
}
}
}
catch (ex)
{
this.emit('error', ex);
}
finally
{
this._reading = false;
}
})();
}
_write(data, _, cb)
{
(async () =>
{
try
{
const encoded = data.encoded || await transaction(this._knex, async trx =>
{
const device = await this._device(data.encoding.DevAddr, trx);
if (!device)
{
// we don't know this device
throw new Error('unknown device');
}
if (!device.NwkSKey || !device.AppSKey)
{
// can't be abp because abp keys aren't nullable
throw new Error('device not joined');
}
if (device.FCntDown > this._options.FCntDownMax)
{
throw new Error('send frame count exceeded');
}
await this._patch_device(
device, { FCntDown: device.FCntDown + 1 }, trx);
return lora_packet.fromFields(Object.assign(
{
payload: data.payload,
FCnt: device.FCntDown
}, data.encoding), device.AppSKey, device.NwkSKey);
});
const payload = encoded.getPHYPayload();
const header = Buffer.alloc(4);
header[0] = PROTOCOL_VERSION;
crypto.randomFillSync(header, 1, 2);
header[3] = pkts.PULL_RESP;
const txpk = Object.assign(
{
data: payload.toString('base64'),
size: payload.length
}, data.header);
await this._downlink_out.writeAsync(Buffer.concat([
header,
Buffer.from(JSON.stringify({txpk: txpk}))]));
const tx_ack = await wait_for(this._downlink_in, pkts.TX_ACK);
if ((tx_ack !== null) &&
((tx_ack[1] !== header[1]) ||
(tx_ack[2] !== header[2])))
{
throw new Error('TX_ACK token mismatch');
}
cb();
}
catch (ex)
{
cb(ex);
}
})();
}
_header(msg, delay)
{
return {
tmst: msg.tmst + delay,
freq: msg.freq,
rfch: 0, // only 0 can transmit
modu: msg.modu,
datr: msg.datr,
codr: msg.codr,
ipol: true
};
}
async _patch_device(device, data, trx)
{
if (device.NwkAddr)
{
await this._OTAADevices
.query(trx)
.patch(data)
.where('NwkAddr', device.NwkAddr);
}
else
{
await this._ABPDevices
.query(trx)
.patch(data)
.where('DevAddr', device.DevAddr);
}
}
async _join(msg, decoded)
{
// Check OTAA join request is for this app
const buffers = decoded.getBuffers();
if (!buffers.AppEUI.equals(this._options.appid))
{
return;
}
// Check if we know this device
const device = await this._deveui_to_otaa_device(buffers.DevEUI);
if (!device)
{
return;
}
// Verify request
if (!lora_packet.verifyMIC(decoded, null, device.AppKey))
{
return this.emit('verify_mic_failed', device, decoded);
}
// Check for replay
try
{
await this._OTAAHistory
.query()
.insert(
{
DevEUI: buffers.DevEUI,
DevNonce: buffers.DevNonce
});
}
catch (ex)
{
return this.emit('join_replay', device, decoded, ex);
}
// Make AppNonce
const app_nonce = crypto.randomBytes(3);
// Make NwkSKey
const nwk_skey = this._skey(device.AppKey,
0x01,
app_nonce,
buffers.DevNonce);
// Make AppSKey
const app_skey = this._skey(device.AppKey,
0x02,
app_nonce,
buffers.DevNonce);
// Make DevAddr
const dev_addr = this.nwk_addr_to_dev_addr(device.NwkAddr);
// Allow subclass to customise Join Accept message
const data = await this._join_data(
{
msg: msg,
packet: decoded,
nwk_addr: device.NwkAddr,
dev_eui: device.DevEUI,
dev_addr: dev_addr,
reply: {
header: this._header(msg, 5000000), // JOIN_ACCEPT_DELAY1 (5s)
encoding: {
MType: 'Join Accept',
AppNonce: app_nonce,
NetID: this._options.netid,
DevAddr: dev_addr,
// DLSettings:
// 7 RFU (reserved)
// 6-4 RX1DRoffset
// 3-0 RX2 data rate (same as LinkADRReq in spec)
DLSettings: (this._options.RX1DRoffset << 4) |
this._options.RX2DataRate,
RXDelay: this._options.RXDelay
// CFList (optional, none given here):
// Frequences of channels 4-8
// Each 3 bytes (24 bit, freq in Hz / 100), unused is 0
// Followed by 1 RFU byte
}
}
});
// Encode Join Accept message
data.encoded = lora_packet.fromFields(
data.encoding, app_skey, nwk_skey, device.AppKey);
// Save keys
await this._OTAADevices
.query()
.patch(
{
NwkSKey: nwk_skey,
AppSKey: app_skey,
FCntUp: 0,
FCntDown: 0
})
.where('NwkAddr', device.NwkAddr);
// Send Join Accept message
this.write(data);
}
async _data(msg, decoded)
{
return await transaction(this._knex, async trx =>
{
const buffers = decoded.getBuffers();
const device = await this._device(buffers.DevAddr, trx);
if (!device)
{
// we don't know this device
return true;
}
if (!device.NwkSKey || !device.AppSKey)
{
// can't be abp because abp keys aren't nullable
this.emit('not_joined', device, decoded);
return true;
}
if (!lora_packet.verifyMIC(decoded, device.NwkSKey))
{
this.emit('verify_mic_failed', device, decoded);
return true;
}
const fcnt = decoded.getFCnt();
if (fcnt < device.FCntUp)
{
this.emit('data_replay', device, decoded);
return true;
}
await this._patch_device(device, { FCntUp: fcnt + 1 }, trx)
return this.push(
{
msg: msg,
packet: decoded,
nwk_addr: device.NwkAddr,
dev_eui: device.DevEUI,
dev_addr: buffers.DevAddr,
payload: lora_packet.decrypt(decoded, device.AppSKey, device.NwkSKey),
reply: {
header: this._header(msg, 1000000), // RECEIVE_DELAY1 (1s)
encoding: {
MType: 'Unconfirmed Data Down',
DevAddr: buffers.DevAddr,
FCtrl: {
ADR: false,
ADRACKReq: false,
ACK: decoded.getMType() === 'Confirmed Data Up',
FPending: false
},
FPort: 1
}
}
});
});
}
_skey(app_key, type, app_nonce, dev_nonce)
{
return Link.skey(this._options.netid, app_key, type, app_nonce, dev_nonce);
}
async _device(dev_addr, trx)
{
const device = await this._dev_addr_to_otaa_device(dev_addr, trx);
if (device)
{
return device;
}
return await this._ABPDevices
.query(trx)
.findById(dev_addr);
}
async _join_data(data)
{
return data.reply;
}
/**
* Combines the unique address of a device with the network identifier
* configured for this {@link #link|link} (`options.netid`).
*
* @param {Buffer} nwk_addr - Device address within the network.
* @returns {Buffer} - 25 lsb: `nwk_addr`; 7 msb: the 7 lsb of `options.netid`.
*/
nwk_addr_to_dev_addr(nwk_addr)
{
const dev_addr = Buffer.from(nwk_addr);
// 7 msb of DevAddr match 7 lsb of netid (NwkID)
dev_addr[0] &= 0x1;
dev_addr[0] |= (this._options.netid[2] & 0x7f) << 1;
return dev_addr;
}
/**
* Checks if the supplied device address is on the network configured
* for this {@link #link|link} (`options.netid`).
*
* @param {Buffer} dev_addr - Combined device and network address.
* @returns {Buffer|null} - If the device is on the configured network then the 25 lsb of `dev_addr` otherwise `null`.
*/
dev_addr_to_nwk_addr(dev_addr)
{
// Check if from OTAA device on this network
// (7 msb of DevAddr match 7 lsb of netid (NwkID))
if ((dev_addr[0] >> 1) === (this._options.netid[2] & 0x7f))
{
const nwk_addr = Buffer.from(dev_addr);
nwk_addr[0] &= 0x01;
return nwk_addr
}
return null;
}
async _dev_addr_to_otaa_device(dev_addr, trx)
{
const nwk_addr = this.dev_addr_to_nwk_addr(dev_addr);
if (nwk_addr)
{
// OTAA device
return await this._OTAADevices
.query(trx)
.findById(nwk_addr);
}
return null;
}
async _deveui_to_otaa_device(deveui)
{
return await this._OTAADevices
.query()
.findOne('DevEUI', deveui);
}
/**
* If the supplied device address is on the network configured
* for this {@link #link|link} (`options.netid`) then return its unique
* global device ID (IEEE EUI64).
*
* @param {Buffer} dev_addr - Combined device and network address.
* @returns {Buffer|null} - If the device is on the configured network then its IEEE EUI64 ID otherwise `null`.
*/
async dev_addr_to_deveui(dev_addr)
{
const device = await this._dev_addr_to_otaa_device(dev_addr)
if (device)
{
return device.DevEUI;
}
return null;
}
}
// For testing
Link.skey = function (netid, app_key, type, app_nonce, dev_nonce)
{
const cipher = crypto.createCipheriv('aes-128-ecb', app_key, '');
cipher.setAutoPadding(false);
const skey = [];
const update = buf =>
{
// The octet order for all multi-octet fields is little endian
for (let i = buf.length - 1; i >= 0; i -= 1)
{
skey.push(cipher.update(buf.slice(i, i + 1)));
}
};
update(Buffer.from([type]));
update(app_nonce);
update(netid);
update(dev_nonce);
update(Buffer.alloc(7));
skey.push(cipher.final());
return Buffer.concat(skey);
};
exports.Link = Link;
|