Raw Books

const ws = require('ws')
const w = new ws('wss://api-pub.bitfinex.com/ws/2')

w.on('message', (msg) => console.log(msg))

let msg = JSON.stringify({ 
  event: 'subscribe', 
  channel: 'book',
  prec: 'R0',
  symbol: 'tBTCUSD' 
})

w.on('open', () => w.send(msg))

wscat -c wss://api-pub.bitfinex.com/ws/2
{ "event": "subscribe", "channel": "book", "prec": "R0", "symbol": "tBTCUSD" }

ws = websocket.WebSocketApp('wss://api-pub.bitfinex.com/ws/2')

ws.on_open = lambda self: self.send('{ "event": "subscribe", "channel": "book", "prec": "R0", "symbol": "tBTCUSD" }')

ws.on_message = lambda self, evt:  print (evt)

// request
{ 
  event: 'subscribe',
  channel: 'book',
  symbol: SYMBOL,
  prec: PRECISION,
  freq: FREQUENCY,
  len: LENGTH,
	subId: SUBID
}

{"event":"subscribe","channel":"book","symbol":"tBTCUSD","prec":"R0","freq":"F0","len":"25","subId": 123}
// response
{ 
  event: 'subscribed',
  channel: 'book',
  chanId: CHANNEL_ID,
  symbol: SYMBOL,
  prec: PRECISION,
  freq: FREQUENCY,
  len: LENGTH,
	subId: SUBID,
	pair: PAIR 
}

{"event":"subscribed","channel":"book","chanId":10092,"symbol":"tETHUSD","prec":"R0","freq":"F0","len":"25","subId":123,"pair":"ETHUSD"}

// on trading pairs (ex. tBTCUSD)

[
  433290, //CHANNEL_ID
  [
    [
      34753002978, //ORDER_ID
      7294.7, //PRICE
      1.54340371 //AMOUNT
    ], //BOOK_ENTRY
    ...
  ] //BOOK_ENTRIES
]  
  
// on funding currencies (ex. fUSD)

[
  472778, //CHANNEL_ID
  [
    [
      658282397, //OFFER_ID
      30, //PERIOD
      0.000233, //RATE
      -530 //AMOUNT
    ], //BOOK_ENTRY
    ...
  ] //BOOK_ENTRIES
]

// on trading pairs (ex. tBTCUSD)

[
  433290, //CHANNEL_ID
  [
    34753006045, //ORDER_ID
    0, //PRICE
    -1 //AMOUNT
  ] //BOOK_ENTRY
]
  
// on funding currencies (ex. fUSD)

[
  472778, //CHANNEL_ID
  [
    658286906, //OFFER_ID
    2, //PERIOD
    0, //RATE
    1 //AMOUNT
  ]
]

//Bulk updates can be enabled using a conf event flag of 536870912

// on trading pairs (ex. tBTCUSD)

[
  433290, //CHANNEL_ID
  [
    [
      34753006045, //ORDER_ID
      0, //PRICE
      -1 //AMOUNT
    ], //BOOK_ENTRY
  	...
  ] //BOOK_ENTRIES
]
  
// on funding currencies (ex. fUSD)

[
  472778, //CHANNEL_ID
  [
    [
      658286906, //OFFER_ID
      2, //PERIOD
      0, //RATE
      1 //AMOUNT
    ], //BOOK_ENTRY
  	...
  ] //BOOK_ENTRIES
]