Develop a Rocket.Chat SDK Bot

This bot is a simple example of how you can use Rocket.Chat JS SDK methods directly. It is extremely basic and does not handle errors, different message types, server resets and other production situations.
RocketChat SDK Bot Quick Start Guide
Rocket.Chat Bot is a Node.js package and works with Node and npm.
Install Rocket.Chat SDK Package
Open up terminal in the directory you wish to develop your bot in and run the following command
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npm init -y
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npm install @rocket.chat/sdk
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Create SDK Bot Files
To proceed with the simplest setup, you need to create two files: the first one will be responsible for the working logic of the bot. Another one will contain a map with the responses.
create a server.js file with the following content:
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const { driver } = require('@rocket.chat/sdk');
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const respmap  = require('./reply');
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​
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// Environment Setup
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const HOST = '<ROCKETCHAT HOST>';
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const USER = '<BOT USER NAME>';
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const PASS = '<BOT USER PASS>';
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const BOTNAME = '<ROCKET CHAT BOT ALIAS>';
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const SSL = '<SSL USAGE>';
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const ROOMS = ['<ROCKETCHAT CHANNEL>'];
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var myUserId;
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​
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// Bot configuration
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const runbot = async () => {
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    const conn = await driver.connect({ host: HOST, useSsl: SSL })
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    myUserId = await driver.login({ username: USER, password: PASS });
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    const roomsJoined = await driver.joinRooms( ROOMS );
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    console.log('joined rooms');
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​
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    const subscribed = await driver.subscribeToMessages();
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    console.log('subscribed');
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​
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    const msgloop = await driver.reactToMessages( processMessages );
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    console.log('connected and waiting for messages');
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​
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    const sent = await driver.sendToRoom( BOTNAME + ' is listening ...', ROOMS[0]);
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    console.log('Greeting message sent');
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}
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​
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// Process messages
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const processMessages = async(err, message, messageOptions) => {
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if (!err) {
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    if (message.u._id === myUserId) return;
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    const roomname = await driver.getRoomName(message.rid);
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​
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    console.log('got message ' + message.msg)
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    var response;
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    if (message.msg in respmap) {
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        response = respmap[message.msg];
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    }
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    const sentmsg = await driver.sendToRoomId(response, message.rid)
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    }
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}
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​
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runbot()
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NOTE: Adjust the Environment Setup section content to fit your server and user credentials.
Make sure <BOT USER NAME> has a BOT role on the server. For more information on how to create a bot user please refer to this page.
create a reply.js file with the following content:
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const respmap = {
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    "hi" : "hey",
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    "u da bot" : "no, YOU da bot",
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    "no u da bot" : "Come'on - YOU DA BOT!!",
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    "I give up" : "ok. silly human :rolleyes:"
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};
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​
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module.exports = respmap;
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Run the SDK Bot
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node server.js
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After executing the last command, Rocket.Chat SDK bot will try to connect to the Rocket.Chat instance and then will listen to messages in general room:
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$ node server.js
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[connect] Connecting { username: 'username',
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  password: 'pass',
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  ldap: false,
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  host: 'rocket.chat.host',
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  useSsl: true,
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  timeout: 20000,
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  rooms: [],
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  allPublic: false,
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  dm: false,
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  livechat: false,
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  edited: false,
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  integrationId: 'js.SDK',
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  roomCacheMaxSize: 10,
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  roomCacheMaxAge: 300000,
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  dmCacheMaxSize: 10,
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  dmCacheMaxAge: 100000 }
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[connect] Connected
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[login] Logging in botUser
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[getRoomIdByNameOrId] Calling (caching): general
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[getRoomIdByNameOrId] Success: "GENERAL"
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[joinRoom] Calling (async): ["GENERAL"]
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[joinRoom] Success
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joined rooms
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[subscribe] Preparing subscription: stream-room-messages: __my_messages__
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[subscribe] Stream ready: 4
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subscribed
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[reactive] Listening for change events in collection stream-room-messages
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connected and waiting for messages
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[getRoomIdByNameOrId] Calling (cached): general
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[getRoomIdByNameOrId] Success: "GENERAL"
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[sendMessage] Calling (async): [{"msg":"Rocket.Chat BOT is listening ...","bot":{"i":"js.SDK"},"rid":"GENERAL"}]
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[sendMessage] Success: {"msg":"Rocket.Chat BOT is listening ...","bot":{"i":"js.SDK"},"rid":"GENERAL","ts":{"$date":1573598821912},"u":{"_id":"GDJn6Exf9LpK2Pp5n","username":"botUser"},"mentions":[],"channels":[],"_updatedAt":{"$date":1573598821920},"_id":"6yTcbcNKuMDBdPsFc"}
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Greeting message sent
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[received] Message in room GENERAL
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Talk to Your SDK Bot
On the server, login as a regular user (not the BOT user), go to general room, and talk to your newly created bot:

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RocketChat SDK Bot Quick Start Guide