so for esp32 firmware how to get the token

Thanks for reaching out, Rahul. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.

from your code how log the token will be active??

You're asking how long the token from the example code will be active and how to log or check its expiration. 1) Token TTL behavior • By default the AccessToken you generate has no explicit TTL unless you set one when creating the token. You should set a TTL when generating tokens to limit their lifetime (common practice: 1 hour). 2) How to set TTL when generating the token • Node example (set 1 hour):

const at = new AccessToken('API_KEY', 'API_SECRET');
at.identity = 'esp32-device-01';
at.addGrant({ roomJoin: true, room: 'my-room' });
// set TTL in seconds (3600 = 1 hour)
const token = await at.toJwt({ ttl: 3600 });

• Python example (set 1 hour):

token = (
  api.AccessToken(api_key="API_KEY", api_secret="API_SECRET")
    .with_identity("esp32-device-01")
    .with_grants(api.VideoGrants(room_join=True, room="my-room"))
    .to_jwt(ttl=3600)
)

3) How to log/check token expiration server-side • After generating the JWT, decode it (without verifying signature) to read the

exp

claim and log it: ◦

exp

is a UNIX timestamp (seconds); log

exp

and current time to show TTL. • Example (Node):

const decoded = JSON.parse(Buffer.from(token.split('.')[1], 'base64').toString());
console.log('token exp (unix):', decoded.exp);
console.log('expires in (s):', decoded.exp - Math.floor(Date.now()/1000));

4) How to confirm token validity on ESP32 (client-side) • Log connection success/failure when calling `connect()`: ◦ On success, log that the token worked and the connection is established. ◦ On failure, log the error (LiveKit returns authentication/expiry errors if token is invalid or expired). • Optionally, before using a token on the device, decode the JWT payload server-side and send the

exp

timestamp to the device so the ESP32 can know when to request a fresh token. If you want, tell me which server language you're using (Node/Python/Go) and how the ESP32 receives the token (HTTPS/MQTT), and I’ll provide exact code to log

exp

and handle refresh.

is it mandatry to give room name??

You're asking whether a room name is mandatory in the token — yes. • To allow a participant to join a room you must include

roomJoin: true

and a

room

field in the token's VideoGrant. • The

room

specifies which room the token is valid for; without it (when

roomJoin

is true) the server will reject the connection. If you need a token that can join any room, describe that use case and I can show alternatives or patterns for multi-room access. Sources: Authentication | LiveKit docs | server-sdk-ruby | livekit/livekit_composite | DeepWiki

so is it possible the esp32 to create a room and join there??,

You're asking whether an ESP32 can create a room and join it — short answer: yes, indirectly. • LiveKit rooms are created automatically when the first participant joins. • The ESP32 cannot generate the signed access token itself; your backend must create a token that includes

roomJoin: true

and the

room

name. • Flow to "create and join" from ESP32: a. ESP32 requests a token from your backend and indicates the desired room name. b. Backend generates a JWT (signed with API Key/Secret) with

roomJoin: true

and

room: "your-room"

, returns the token. c. ESP32 uses that token to connect; the first join will create the room automatically. If you want, tell me which server language you use and how the ESP32 will request the token (HTTPS, MQTT, etc.) and I’ll provide a concrete token-generation snippet and a sample ESP32 connect call. Sources: Connecting to LiveKit | LiveKit docs | Authentication | LiveKit docs

cant we connect to our local runnig livekit ??

Yes — your ESP32 can connect to a locally running LiveKit server. Key points and steps: • Use the local server URL when connecting (e.g.,

ws://<host>:7880

or

wss://<host>:7880

if TLS). Ensure the ESP32 can reach that host on the network. • Tokens must still be generated server-side using the same API Key/Secret that the local LiveKit instance is configured with, and the token must include

roomJoin: true

and the

room

name. • If your LiveKit instance uses self-signed TLS, either use

ws://

(insecure) on a trusted LAN or configure the ESP32 to trust the server certificate for

wss://

. • Typical flow: a. ESP32 requests a JWT from your backend (backend uses API credentials matched to the local LiveKit). b. Backend returns JWT with the intended

room

and TTL. c. ESP32 connects to

ws://<local-ip>:<port>

(or

wss://...

) using the JWT. • Make sure network routing/firewalls allow the ESP32 to reach the LiveKit host and port. If you tell me the local server address, whether you’re using TLS, and how the ESP32 will request tokens (HTTPS/MQTT), I’ll provide a concrete connect-snippet and token-generation example for your stack.

the give a code dummy credeintial is "url": "ws://localhost:7880", "api_key": "key1", "api_secret": "secret1"

You can use those dummy credentials to test locally. Below are minimal, concrete examples showing (1) server-side token generation in Node.js using the LiveKit server SDK with your dummy creds and (2) how the ESP32 uses the returned token to connect. 1) Node.js token generation (express endpoint)

// Install: npm install express livekit-server-sdk
import express from 'express';
import { AccessToken, VideoGrant } from 'livekit-server-sdk';

const app = express();
app.use(express.json());

const API_KEY = 'key1';
const API_SECRET = 'secret1';

<http://app.post|app.post>('/get-token', (req, res) => {
  const { identity = 'esp32-device-01', room = 'test-room', ttl = 3600 } = req.body;

  const at = new AccessToken(API_KEY, API_SECRET);
  at.identity = identity;
  at.addGrant({ roomJoin: true, room });

  // toJwt accepts ttl seconds
  at.toJwt({ ttl }).then((token) => {
    res.json({ token, exp: Math.floor(Date.now()/1000) + ttl });
  }).catch(err => res.status(500).json({ error: err.message }));
});

app.listen(3000, () => console.log('token server on <http://localhost:3000'>));

2) How to request the token from ESP32 (pseudo-code) • ESP32 performs an HTTPS (or HTTP on LAN) POST to

http://<backend-host>:3000/get-token

with JSON body

{"identity":"esp32-01","room":"test-room"}

. • Backend returns

{ "token": "<JWT>", "exp": ... }

. 3) ESP32 connect call (use returned token)

// Pseudo C++ snippet - replace with your ESP32 SDK specifics
String token = "<JWT_FROM_BACKEND>";

room->connect("<ws://localhost:7880>", token.c_str());

Notes and reminders • Do not hardcode `API_KEY`/`API_SECRET` in firmware — keep them only on your backend. • The example sets TTL via

ttl

(seconds). Default used here is 3600s (1 hour); adjust as needed. • For local testing: use

<ws://localhost:7880>

if ESP32 and server are on same host or replace with server IP reachable by device. Use

wss://

only if certificate is trusted by the ESP32. • The backend response includes an

exp

you can log so the device knows when to request a new token. If you want, tell me which ESP32 SDK/library you’re using for WebSocket/LiveKit connection and I’ll provide a concrete ESP32 code snippet for that SDK.

how many time i can use the token that once generated?, each time should we need to regenerate??

Good question — here’s how token usage works and recommended practice. • A generated LiveKit JWT can be used repeatedly until it expires. There’s no fixed usage count — it’s valid for any number of connections/requests while the

exp

(TTL) time has not passed. • Once the token expires you must generate a new one on your backend and deliver it to the ESP32. • Best practices: ◦ Use short TTLs (common: 1 hour) so stolen tokens have limited value. ◦ Don’t hardcode API keys/secrets in firmware — generate tokens server-side. ◦ Log or send the token’s

exp

to the device so it knows when to request a refresh. ◦ For long-lived connections, obtain a fresh token before the current one expires. If you want, tell me the TTL you’re using and how the ESP32 receives tokens (HTTP/MQTT) and I’ll show code to check

exp

and refresh automatically.

this is my token genrrating code, app.use(express.json()); // Token generation endpoint app.get('/token', async (req, res) => { try { const { identity = 'esp32-device-01', room = 'my-room' } = req.query; const at = new AccessToken(API_KEY, API_SECRET); at.identity = identity; at.addGrant({ roomJoin: true, room }); const token = await at.toJwt(); res.json({ token }); } catch (error) { console.error('Error generating token:', error); res.status(500).json({ error: 'Failed to generate token' }); } }); app.listen(PORT, () => { console.log(

Token generator server running on port ${PORT}

); });

Thanks — I reviewed your token-generation code. It will work, but I recommend a few small improvements so your ESP32 can know when to refresh the token and so tokens are time-limited. Suggested changes (concise): 1) Set an explicit TTL when creating the JWT (example: 1 hour = 3600s)

const token = await at.toJwt({ ttl: 3600 });

2) Return the token expiration time (

exp

) to the device so it can refresh before expiry

const expiresAt = Math.floor(Date.now()/1000) + 3600;
res.json({ token, exp: expiresAt });

(Or decode the token server-side to read the

exp

claim and return that.) 3) Optional: accept a

ttl

query param for testing

const ttl = parseInt(req.query.ttl) || 3600;
const token = await at.toJwt({ ttl });
res.json({ token, exp: Math.floor(Date.now()/1000) + ttl });

4) Logging for debugging

console.log(`Generated token for ${identity} room=${room} exp=${Math.floor(Date.now()/1000)+ttl}`);

Notes/reminders: • Do not put `API_KEY`/`API_SECRET` on the ESP32. • ESP32 can reuse the token until `exp`; regenerate only after expiry (or slightly before). • If you want, tell me which refresh strategy you prefer (device-initiated before exp, backend push, or refresh-on-failure) and I’ll provide the exact ESP32-side logic to request and swap tokens.