Release v2.0.0 (#44)

* Added arpTableSolver (#18)

* Added arpTableSolver

* fix package import

* linting class

* changed arp library

* refactor arp class

* using arpping fork

* refactor arpTableSolver class

* Added Zero Conf functionality (LAN mode) (#46)

* added crypto-js

* zeroconf helper functions

* zeroconf update payload

* new method to save devices cache file

* class renamed

* refactor Zeroconf class

* return cached device if exists

* moved method to get local ip address

* fix mac addresses without leading zeroes

* refactor Zeroconf class

* using new zeroconf functionality

* zeroconf working with single and multichannel devices

* save device mixin enhancement

* working on zeroconf test cases

* catch errors on filesystem methods

* zeroconf: added extra test cases

* better error handling

* zeroconf: 100% code coverage

* removed deprecated login method

* updates on credentials file

* version bump

* Docs for v2.0 (#52)

* added v1 docs

* added zeroconf docs

* updated readme

* docs updated

* removed zeroconf article warning

* updated vscode config

Co-authored-by: Luis Llamas <luisllamas@hotmail.com>

.gitignore

@@ -90,4 +90,9 @@ typings/
 
 # End of https://www.gitignore.io/api/node
 
-.idea/
+.idea/
+
+demo.js
+arp-table.json
+devices-cache.json
+test/_setup/credentials.js

.vscode/settings.json

@@ -2,5 +2,8 @@
   "eslint.validate": [
     "javascript"
   ],
-  "eslint.autoFixOnSave": true
+  "eslint.autoFixOnSave": true,
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": true
+  }
 }

README.md

@@ -7,13 +7,14 @@
 * set on/off devices
 * get power consumption on devices like Sonoff POW
 * listen for devices events
+* using zeroconf (LAN mode), no internet connection required
 
 
 ## Installation
-``` sh
+```sh
  npm install ewelink-api
 ```
 
 
 ## Usage
-Check docs at https://ewelink-api.now.sh
+Check library documentation and examples at https://github.com/skydiver/ewelink-api/docs

classes/PowerState/ChangeStateZeroconf.js

@@ -0,0 +1,40 @@
+const rp = require('request-promise');
+
+const WebSocket = require('../WebSocket');
+const payloads = require('../../lib/payloads');
+const { _get } = require('../../lib/helpers');
+
+class ChangeStateZeroconf extends WebSocket {
+  static async set({ url, device, params, switches, state }) {
+    const selfApikey = device.apikey;
+    const deviceId = device.deviceid;
+    const deviceKey = device.devicekey;
+
+    const endpoint = switches ? 'switches' : 'switch';
+    const localUrl = `${url}/${endpoint}`;
+
+    const body = payloads.zeroConfUpdatePayload(
+      selfApikey,
+      deviceId,
+      deviceKey,
+      params
+    );
+
+    const response = await rp({
+      method: 'POST',
+      uri: localUrl,
+      body,
+      json: true,
+    });
+
+    const error = _get(response, 'error', false);
+
+    if (error === 403) {
+      return { error, msg: response.reason };
+    }
+
+    return { status: 'ok', state };
+  }
+}
+
+module.exports = ChangeStateZeroconf;

classes/PowerState/index.js

@@ -1,5 +1,7 @@
 const ChangeState = require('./ChangeState');
+const ChangeStateZeroconf = require('./ChangeStateZeroconf');
 
 module.exports = {
   ChangeState,
+  ChangeStateZeroconf,
 };

classes/Zeroconf.js

@@ -0,0 +1,91 @@
+const fs = require('fs');
+const arpping = require('arpping')({});
+
+class Zeroconf {
+  /**
+   * Build the ARP table
+   * @param ip
+   * @returns {Promise<unknown>}
+   */
+  static getArpTable(ip = null) {
+    return new Promise((resolve, reject) => {
+      arpping.discover(ip, (err, hosts) => {
+        if (err) {
+          return reject(err);
+        }
+        const arpTable = Zeroconf.fixMacAddresses(hosts);
+        return resolve(arpTable);
+      });
+    });
+  }
+
+  /**
+   * Sometime arp command returns mac addresses without leading zeroes.
+   * @param hosts
+   */
+  static fixMacAddresses(hosts) {
+    return hosts.map(host => {
+      const octets = host.mac.split(':');
+
+      const fixedMac = octets.map(octet => {
+        if (octet.length === 1) {
+          return `0${octet}`;
+        }
+        return octet;
+      });
+
+      return {
+        ip: host.ip,
+        mac: fixedMac.join(':'),
+      };
+    });
+  }
+
+  /**
+   * Save ARP table to local file
+   * @param config
+   * @returns {Promise<{error: string}|{file: {request: string; resolved: string} | any | string | string, status: string}>}
+   */
+  static async saveArpTable(config = {}) {
+    const ip = config.ip || null;
+    const fileName = config.file || './arp-table.json';
+    try {
+      const arpTable = await Zeroconf.getArpTable(ip);
+      const jsonContent = JSON.stringify(arpTable, null, 2);
+      fs.writeFileSync(fileName, jsonContent, 'utf8');
+      return { status: 'ok', file: fileName };
+    } catch (e) {
+      return { error: e.toString() };
+    }
+  }
+
+  /**
+   * Read ARP table file
+   * @param fileName
+   * @returns {Promise<{error: string}|any>}
+   */
+  static async loadArpTable(fileName = './arp-table.json') {
+    try {
+      const jsonContent = await fs.readFileSync(fileName);
+      return JSON.parse(jsonContent);
+    } catch (e) {
+      return { error: e.toString() };
+    }
+  }
+
+  /**
+   * Read devices cache file
+   * @param fileName
+   * @returns {Promise<{error: string}>}
+   */
+  static async loadCachedDevices(fileName = './devices-cache.json') {
+    try {
+      const jsonContent = await fs.readFileSync(fileName);
+      return JSON.parse(jsonContent);
+    } catch (e) {
+      return { error: e.toString() };
+    }
+  }
+}
+
+module.exports = Zeroconf;

docs/README.md

@@ -0,0 +1,27 @@
+# Documentation
+
+* [Introduction](introduction.md)
+* [Quickstart](quickstart.md)
+* [Class Instantiation](class-instantiation.md)
+* [Demos](demos/README.md)
+  * [node script](demos/node.md)
+  * [serverless](demos/serverless.md)
+* [Available Methods](available-methods/README.md)
+  * [getCredentials](available-methods/getcredentials.md)
+  * [openWebSocket](available-methods/openwebsocket.md)
+  * [getDevice](available-methods/getdevice.md)
+  * [getDevices](available-methods/getdevices.md)
+  * [getDevicePowerState](available-methods/getdevicepowerstate.md)
+  * [setDevicePowerState](available-methods/setdevicepowerstate.md)
+  * [toggleDevice](available-methods/toggledevice.md)
+  * [getDevicePowerUsage](available-methods/getdevicepowerusage.md)
+  * [getDeviceCurrentTH](available-methods/getdevicecurrentth.md)
+  * [getDeviceCurrentTemperature](available-methods/getdevicecurrenttemperature.md)
+  * [getDeviceCurrentHumidity](available-methods/getdevicecurrenthumidity.md)
+  * [getDeviceChannelCount](available-methods/getdevicechannelcount.md)
+  * [getRegion](available-methods/getregion.md)
+  * [getFirmwareVersion](available-methods/getfirmwareversion.md)
+  * [saveDevicesCache](available-methods/savedevicescache.md)
+  * [login](available-methods/login.md) <sup>_*deprecated_</sup>
+* [Zeroconf (LAN mode)](zeroconf.md)
+* [Testing](testing.md)

docs/available-methods/README.md

@@ -0,0 +1,24 @@
+# Available Methods
+
+Here is the list of available methods.
+
+* [getCredentials](getcredentials.md)
+* [openWebSocket](openwebsocket.md)
+* [getDevice](getdevice.md)
+* [getDevices](getdevices.md)
+* [getDevicePowerState](getdevicepowerstate.md)
+* [setDevicePowerState](setdevicepowerstate.md)
+* [toggleDevice](toggledevice.md)
+* [getDevicePowerUsage](getdevicepowerusage.md)
+* [getDeviceCurrentTH](getdevicecurrentth.md)
+* [getDeviceCurrentTemperature](getdevicecurrenttemperature.md)
+* [getDeviceCurrentHumidity](getdevicecurrenthumidity.md)
+* [getDeviceChannelCount](getdevicechannelcount.md)
+* [getRegion](getregion.md)
+* [getFirmwareVersion](getfirmwareversion.md)
+* [saveDevicesCache](savedevicescache.md)
+* [login](login.md) <sup>_*deprecated_</sup>
+
+Remember to instantiate class before usage.
+
+Also, take a look at the provided demos for [node script](../demos/node.md) and [serverless](../demos/serverless.md).

docs/available-methods/getcredentials.md

@@ -0,0 +1,20 @@
+# getCredentials
+
+Get your access token, api key and region.
+
+This method is useful on serverless context, where you need to obtain auth credentials to make individual requests.
+
+
+### Usage
+```
+  const auth = await connection.getCredentials();
+
+  console.log('access token: ', auth.at);
+  console.log('api key: ', auth.user.apikey);
+  console.log('region: ', auth.region);
+
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+> Access token and api key will be invalidate after you login again using email and password.

docs/available-methods/getdevice.md

@@ -0,0 +1,13 @@
+# getDevice
+
+Return information for specified device.
+
+
+### Usage
+```
+  /* get specific device information */
+  const device = await connection.getDevice('<your device id>');
+  console.log(device);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>

docs/available-methods/getdevicechannelcount.md

@@ -0,0 +1,12 @@
+# getDeviceChannelCount
+
+Return total channels for specified device.
+
+
+### Usage
+```
+  const channels = await connection.getDeviceChannelCount('<your device id>');
+  console.log(channels);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>

docs/available-methods/getdevicecurrenthumidity.md

@@ -0,0 +1,21 @@
+# getDeviceCurrentHumidity
+
+Return current humidity for specified device.
+
+
+### Usage
+```
+  const humidity = await connection.getDeviceCurrentHumidity('<your device id>');
+  console.log(humidity);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    status: 'ok',
+    humidity: '76'
+  }
+```

docs/available-methods/getdevicecurrenttemperature.md

@@ -0,0 +1,21 @@
+# getDeviceCurrentTemperature
+
+Return current temperature for specified device.
+
+
+### Usage
+```
+  const temperature = await connection.getDeviceCurrentTemperature('<your device id>');
+  console.log(temperature);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    status: 'ok',
+    temperature: '20'
+  }
+```

docs/available-methods/getdevicecurrentth.md

@@ -0,0 +1,22 @@
+# getDeviceCurrentTH
+
+Return current temperature and humidity for specified device.
+
+
+### Usage
+```
+  const temphumd = await connection.getDeviceCurrentTH('<your device id>');
+  console.log(temphumd);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    status: 'ok',
+    temperature: '20',
+    humidity: '76'
+  }
+```

docs/available-methods/getdevicepowerstate.md

@@ -0,0 +1,27 @@
+# getDevicePowerState
+
+Query for specified device power status.
+
+
+### Usage
+```js
+  const status = await connection.getDevicePowerState('<your device id>');
+  console.log(status);
+```
+
+```js
+  // multi-channel devices like Sonoff 4CH
+  const status = await connection.getDevicePowerState('<your device id>', <channel>);
+  console.log(status);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    status: 'ok',
+    state: 'off'
+  }
+```

docs/available-methods/getdevicepowerusage.md

@@ -0,0 +1,50 @@
+# getDevicePowerUsage
+
+Returns current month power usage on device who supports electricity records, like Sonoff POW.
+
+
+### Usage
+```
+  const usage = await connection.getDevicePowerUsage('<your device id>');
+  console.log(usage);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+{
+  status: 'ok',
+  monthly: 109.78,
+  daily:
+    [
+      { day: 26, usage: 4.19 },
+      { day: 25, usage: 2.11 },
+      { day: 24, usage: 3.74 },
+      { day: 23, usage: 8.23 },
+      { day: 22, usage: 3.16 },
+      { day: 21, usage: 3.95 },
+      { day: 20, usage: 3.38 },
+      { day: 19, usage: 4.56 },
+      { day: 18, usage: 1.51 },
+      { day: 17, usage: 2.4 },
+      { day: 16, usage: 1.5 },
+      { day: 15, usage: 7.28 },
+      { day: 14, usage: 7.44 },
+      { day: 13, usage: 3.21 },
+      { day: 12, usage: 5.5 },
+      { day: 11, usage: 4.43 },
+      { day: 10, usage: 3.15 },
+      { day: 9, usage: 1.33 },
+      { day: 8, usage: 2.9 },
+      { day: 7, usage: 6.03 },
+      { day: 6, usage: 7.48 },
+      { day: 5, usage: 5.94 },
+      { day: 4, usage: 3.64 },
+      { day: 3, usage: 2.39 },
+      { day: 2, usage: 3.10 },
+      { day: 1, usage: 7.23 }
+  ]
+}
+```

docs/available-methods/getdevices.md

@@ -0,0 +1,13 @@
+# getDevices
+
+Returns a list of devices associated to logged account.
+
+
+### Usage
+```
+  /* get all devices */
+  const devices = await connection.getDevices();
+  console.log(devices);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>

docs/available-methods/getfirmwareversion.md

@@ -0,0 +1,12 @@
+# getFirmwareVersion
+
+Return firmware version for specified device.
+
+
+### Usage
+```
+  const firmware = await connection.getFirmwareVersion('<your device id>');
+  console.log(firmware);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>

docs/available-methods/getregion.md

@@ -0,0 +1,23 @@
+# getRegion
+
+Return logged user region.
+
+> This method only works if class is initialized using email and password.
+
+
+### Usage
+```
+  const region = await connection.getRegion();
+  console.log(region);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    email: 'user@email.com',
+    region: 'us'
+  }
+```

docs/available-methods/login.md

@@ -0,0 +1,20 @@
+# Login
+
+> DEPRECATED: use [getCredentials](available-methods/getcredentials.md) method instead
+
+Login into eWeLink API and get auth credentials.
+
+This method is useful on serverless context, where you need to obtain auth credentials to make individual requests.
+
+
+### Usage
+```
+  const auth = await connection.login();
+
+  console.log('access token: ', auth.at);
+  console.log('api key: ', auth.user.apikey);
+  console.log('region: ', auth.region);
+
+```
+
+<sup>* _Remember to instantiate class before use_</sup>

docs/available-methods/openwebsocket.md

@@ -0,0 +1,70 @@
+# openWebSocket
+
+Opens a socket connection to eWeLink and listen for realtime events.
+
+
+### Usage
+
+The `openWebSocket` method requires a callback function as an argument.
+
+Once an event is received, the callback function will be executed with the server message as argument.
+
+
+```js
+// instantiate class
+const connection = new ewelink({
+  email: '<your ewelink email>',
+  password: '<your ewelink password>',
+  region: '<your ewelink region>',
+});
+
+// login into eWeLink
+await connection.login();
+
+// call openWebSocket method with a callback as argument
+const socket = await connection.openWebSocket(async data => {
+  // data is the message from eWeLink
+  console.log(data)
+});
+```
+
+
+### Response example
+
+If everything went well, the first message will have the following format:
+```js
+{
+  error: 0,
+  apikey: '12345678-9012-3456-7890-123456789012',
+  config: {
+    hb: 1,
+    hbInterval: 12345
+  },
+  sequence: '1234567890123'
+}
+```
+
+When a device change his status, a similar message will be returned:
+```js
+{
+  action: 'update',
+  deviceid: '1234567890',
+  apikey: '12345678-9012-3456-7890-123456789012',
+  userAgent: 'device',
+  sequence: '1234567890123'
+  ts: 0,
+  params: {
+    switch: 'on'
+  },
+  from: 'device',
+  seq: '11'
+}
+```
+
+
+
+### Notes
+
+* Because of the nature of a socket connection, the script will keep running until the connection gets closed.
+* `openWebSocket` will return the socket instance
+* if you need to manually kill the connection, just run `socket.close()` (where socket is the variable used).

docs/available-methods/savedevicescache.md

@@ -0,0 +1,19 @@
+# saveDevicesCache
+
+Save devices cache file (required when using zeroconf)
+
+
+### Usage
+```
+  const ewelink = require('ewelink-api');
+
+  const connection = new ewelink({
+    email: '<your ewelink email>',
+    password: '<your ewelink password>',
+    region: '<your ewelink region>',
+  });
+
+  await connection.saveDevicesCache();
+```
+
+A file named devices-cache.json will be created.

docs/available-methods/setdevicepowerstate.md

@@ -0,0 +1,29 @@
+# setDevicePowerState
+
+Change specified device power state.
+
+
+### Usage
+```js
+  const status = await connection.setDevicePowerState('<your device id>', 'on');
+  console.log(status);
+```
+
+```js
+  // multi-channel devices like Sonoff 4CH
+  const status = await connection.setDevicePowerState('<your device id>', 'toggle', <channel>);
+  console.log(status);
+```
+
+Possible states: `on`, `off`, `toggle`.
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    status: 'ok',
+    state: 'on'
+  }
+```

docs/available-methods/toggledevice.md

@@ -0,0 +1,27 @@
+# toggleDevice
+
+Switch specified device current power state.
+
+
+### Usage
+```js
+  const status = await connection.toggleDevice('<your device id>');
+  console.log(status);
+```
+
+```js
+  // multi-channel devices like Sonoff 4CH
+  const status = await connection.toggleDevice('<your device id>', <channel>);
+  console.log(status);
+```
+
+<sup>* _Remember to instantiate class before use_</sup>
+
+
+### Response example
+```js
+  {
+    status: 'ok',
+    state: 'off'
+  }
+```

docs/class-instantiation.md

@@ -0,0 +1,24 @@
+# Class Instantiation
+
+> Default region of this library is `us`. If your are in a different one, **you must** specify region parameter or error 400/401 will be returned.
+
+**_Using email and password_**
+```
+  const connection = new ewelink({
+    email: '<your ewelink email>',
+    password: '<your ewelink password>',
+    region: '<your ewelink region>',
+  });
+```
+
+**_Using access token and api key_**
+```
+  const connection = new ewelink({
+    at: '<valid access token>',
+    apiKey: '<valid api key>',
+    region: '<your ewelink region>',
+  });
+```
+
+> * If you don't know your region, use [getRegion](available-methods/getregion) method
+> * To get your access token and api key, use [getCredentials](available-methods/getcredentials) method

docs/demos/README.md

@@ -0,0 +1,8 @@
+# Demos
+
+### node script
+* [Read](node.md) how to use this library on a nodejs script.
+
+
+### serverless
+* [Read](serverless.md) how to integrate on your serverles environment, like a lambda function.

docs/demos/node.md

@@ -0,0 +1,30 @@
+# node script
+
+> Default region of this library is `us`. If your are in a different one, **you must** specify region parameter or error 400/401 will be returned.
+
+```js
+const ewelink = require('ewelink-api');
+
+(async () => {
+
+  const connection = new ewelink({
+    email: '<your ewelink email>',
+    password: '<your ewelink password>',
+    region: '<your ewelink region>',
+  });
+
+  /* get all devices */
+  const devices = await connection.getDevices();
+  console.log(devices);
+
+  /* get specific devide info */
+  const device = await connection.getDevice('<your device id>');
+  console.log(device);
+
+  /* toggle device */
+  await connection.toggleDevice('<your device id>');
+
+})();
+```
+
+> If you don't know your region, use [getRegion](/docs/available-methods/getregion) method

docs/demos/serverless.md

@@ -0,0 +1,73 @@
+# serverless
+
+On a serverless scenario you need to instantiate the class on every request.
+
+So, instead of using email and password on every api call, you can login the first time then use auth credentials for future requests.
+
+> Default region of this library is `us`. If your are in a different one, **you must** specify region parameter or error 400/401 will be returned.
+
+
+```js
+/* first request: get access token and api key */
+(async () => {
+
+  const connection = new ewelink({
+    email: '<your ewelink email>',
+    password: '<your ewelink password>',
+    region: '<your ewelink region>',
+  });
+
+  const login = await connection.login();
+
+  const accessToken = login.at;
+  const apiKey = login.user.apikey
+  const region = login.region;
+
+})();
+```
+
+```js
+/* second request: use access token to request devices */
+(async () => {
+
+  const newConnection = new ewelink({
+    at: accessToken,
+    region: region
+  });
+
+  const devices = await newConnection.getDevices();
+  console.log(devices);
+
+})();
+```
+
+```js
+/* third request: use access token to request specific device info */
+(async () => {
+
+  const thirdConnection = new ewelink({
+    at: accessToken,
+    region: region
+  });
+
+  const device = await thirdConnection.getDevice('<your device id>');
+  console.log(device);
+
+})();
+```
+
+```js
+/* fourth request: use access token and api key to toggle specific device info */
+(async () => {
+
+  const anotherNewConnection = new ewelink({
+    at: accessToken,
+    region: region
+  });
+
+  await anotherNewConnection.toggleDevice('<your device id>');
+
+})();
+```
+
+> If you don't know your region, use [getRegion](/docs/available-methods/getregion) method

docs/introduction.md

@@ -0,0 +1,25 @@
+# Getting Started
+
+**eWeLink API for JavaScript** is a module who let you interact directly with eWeLink API using your regular credentials.
+
+
+## Installation
+
+Install package on your node project:
+```
+npm install ewelink-api
+```
+
+
+## Key features
+
+* can run on browsers, node scripts or serverless environment
+* set on/off devices
+* get power consumption on devices like Sonoff POW
+* listen for devices events
+
+
+## Help, comments, contributions?
+
+* Repo: https://github.com/skydiver/ewelink-api
+* Issue tracker: https://github.com/skydiver/ewelink-api/issues

docs/quickstart.md

@@ -0,0 +1,22 @@
+# Quickstart
+
+Here is a basic node script to start working with the module:
+
+> Default region of this library is `us`. If your are in a different one, **you must** specify region parameter or error 400/401 will be returned.
+
+```js
+const ewelink = require('ewelink-api');
+
+/* instantiate class */
+const connection = new ewelink({
+  email: '<your ewelink email>',
+  password: '<your ewelink password>',
+  region: '<your ewelink region>',
+});
+
+/* get all devices */
+const devices = await connection.getDevices();
+console.log(devices);
+```
+
+> If you don't know your region, use [getRegion](available-methods/getregion.md) method

docs/testing.md

@@ -0,0 +1,8 @@
+# Testing
+
+Open `test/_setup/credentials.json` and update parameters.
+
+In a terminal, `npm run test` or `npm run coverage`.
+
+
+> tests needs to be performed serially, so if run jest manually, add `--runInBand` parameter.

docs/zeroconf.md

@@ -0,0 +1,66 @@
+# Zeroconf (LAN mode)
+
+> Zeroconf only works if you're connected to the same network of the device you wanna control.
+
+
+## Notes
+* at this time, only turn on/off action is available.
+* after initial setup, internet connection is not required to turn on/off your devices.
+
+
+## Introduction
+Before start, you will need to create 2 files with information about your devices (the library includes methods to generate both files).
+1. a cache file with information about your devices.
+2. an "arp table" cache file with info from your network connected devices.
+3. toggle specific device power state
+
+
+## 1. Generate devices cache file
+
+```js
+const ewelink = require('ewelink-api');
+
+const connection = new ewelink({
+  email: '<your ewelink email>',
+  password: '<your ewelink password>',
+  region: '<your ewelink region>',
+});
+
+await connection.saveDevicesCache();
+```
+
+A file named `devices-cache.json` will be created.
+
+
+## 2. Generate arp table cache file
+
+```js
+const Zeroconf = require('ewelink-api/classes/Zeroconf');
+
+await Zeroconf.saveArpTable({
+  ip: '<your network addres, ex: 192.168.5.1>'
+});
+```
+
+A file named `arp-table.json` will be created.
+
+
+## 3. toggle device power state
+
+```js
+const ewelink = require('ewelink-api');
+const Zeroconf = require('ewelink-api/classes/Zeroconf');
+
+/* load cache files */
+const devicesCache = await Zeroconf.loadCachedDevices();
+const arpTable = await Zeroconf.loadArpTable();
+
+/* create the connection using cache files */
+const connection = new ewelink({ devicesCache, arpTable });
+
+/* turn device on */
+await connection.setDevicePowerState('<your device id>', 'on');
+
+/* turn device off */
+await connection.setDevicePowerState('<your device id>', 'off');
+```

lib/ewelink-helper.js

@@ -1,4 +1,5 @@
 const crypto = require('crypto');
+const CryptoJS = require('crypto-js');
 const random = require('random');
 
 const DEVICE_TYPE_UUID = require('./data/devices-type-uuid');
@@ -26,8 +27,49 @@ const getDeviceChannelCount = deviceUUID => {
   return getDeviceChannelCountByType(deviceType);
 };
 
+const create16Uiid = () => {
+  let result = '';
+  for (let i = 0; i < 16; i += 1) {
+    result += random.int(0, 9);
+  }
+  return result;
+};
+
+const encryptionBase64 = t =>
+  CryptoJS.enc.Base64.stringify(CryptoJS.enc.Utf8.parse(t));
+
+const decryptionBase64 = t =>
+  CryptoJS.enc.Base64.parse(t).toString(CryptoJS.enc.Utf8);
+
+const encryptationData = (data, key) => {
+  const encryptedMessage = {};
+  const uid = create16Uiid();
+  const iv = encryptionBase64(uid);
+  const code = CryptoJS.AES.encrypt(data, CryptoJS.MD5(key), {
+    iv: CryptoJS.enc.Utf8.parse(uid),
+    mode: CryptoJS.mode.CBC,
+    padding: CryptoJS.pad.Pkcs7,
+  });
+  encryptedMessage.uid = uid;
+  encryptedMessage.iv = iv;
+  encryptedMessage.data = code.ciphertext.toString(CryptoJS.enc.Base64);
+  return encryptedMessage;
+};
+
+const decryptionData = (data, key, iv) => {
+  const iv64 = decryptionBase64(iv);
+  const code = CryptoJS.AES.decrypt(data, CryptoJS.MD5(key), {
+    iv: CryptoJS.enc.Utf8.parse(iv64),
+    mode: CryptoJS.mode.CBC,
+    padding: CryptoJS.pad.Pkcs7,
+  });
+  return code.toString(CryptoJS.enc.Utf8);
+};
+
 module.exports = {
   makeAuthorizationSign,
   makeFakeIMEI,
   getDeviceChannelCount,
+  encryptationData,
+  decryptionData,
 };

lib/payloads/index.js

@@ -2,10 +2,12 @@ const firmwareUpdate = require('./firmwareUpdate');
 const credentialsPayload = require('./credentialsPayload');
 const wssLoginPayload = require('./wssLoginPayload');
 const wssUpdatePayload = require('./wssUpdatePayload');
+const zeroConfUpdatePayload = require('./zeroConfUpdatePayload');
 
 module.exports = {
   firmwareUpdate,
   credentialsPayload,
   wssLoginPayload,
   wssUpdatePayload,
+  zeroConfUpdatePayload,
 };

lib/payloads/zeroConfUpdatePayload.js

@@ -0,0 +1,17 @@
+const { encryptationData } = require('../ewelink-helper');
+
+const zeroConfUpdatePayload = (selfApikey, deviceId, deviceKey, params) => {
+  const encryptedData = encryptationData(JSON.stringify(params), deviceKey);
+  const timeStamp = new Date() / 1000;
+  const sequence = Math.floor(timeStamp * 1000);
+  return {
+    sequence: sequence.toString(),
+    deviceid: deviceId,
+    selfApikey,
+    iv: encryptedData.iv,
+    encrypt: true,
+    data: encryptedData.data,
+  };
+};
+
+module.exports = zeroConfUpdatePayload;

main.js

@@ -3,8 +3,16 @@ const rp = require('request-promise');
 const { _get } = require('./lib/helpers');
 
 class eWeLink {
-  constructor({ region = 'us', email, password, at, apiKey }) {
+  constructor({
-    if (!at && (!email && !password)) {
+    region = 'us',
+    email,
+    password,
+    at,
+    apiKey,
+    devicesCache,
+    arpTable,
+  }) {
+    if (!devicesCache && !arpTable && !at && (!email && !password)) {
       return { error: 'No credentials provided' };
     }
 
@@ -13,6 +21,8 @@ class eWeLink {
     this.password = password;
     this.at = at;
     this.apiKey = apiKey;
+    this.devicesCache = devicesCache;
+    this.arpTable = arpTable;
   }
 
   /**
@@ -41,6 +51,16 @@ class eWeLink {
     return `wss://${this.region}-pconnect3.coolkit.cc:8080/api/ws`;
   }
 
+  /**
+   * Generate Zeroconf URL
+   * @param device
+   * @returns {string}
+   */
+  getZeroconfUrl(device) {
+    const ip = this.getLocalIp(device);
+    return `http://${ip}:8081/zeroconf`;
+  }
+
   /**
    * Generate http requests helpers
    *
@@ -103,6 +123,8 @@ const getTHMixin = require('./mixins/temphumd/getTHMixin');
 const getDevicesMixin = require('./mixins/devices/getDevicesMixin');
 const getDeviceMixin = require('./mixins/devices/getDeviceMixin');
 const getDeviceChannelCountMixin = require('./mixins/devices/getDeviceChannelCountMixin');
+const getLocalIpMixin = require('./mixins/devices/getLocalIpMixin');
+const saveDevicesCacheMixin = require('./mixins/devices/saveDevicesCacheMixin');
 
 /* LOAD MIXINS: firmware */
 const getFirmwareVersionMixin = require('./mixins/firmware/getFirmwareVersionMixin');
@@ -133,7 +155,9 @@ Object.assign(
   eWeLink.prototype,
   getDevicesMixin,
   getDeviceMixin,
-  getDeviceChannelCountMixin
+  getDeviceChannelCountMixin,
+  getLocalIpMixin,
+  saveDevicesCacheMixin
 );
 
 Object.assign(

mixins/devices/getDeviceMixin.js

@@ -9,6 +9,10 @@ const getDeviceMixin = {
    * @returns {Promise<{msg: string, error: *}>}
    */
   async getDevice(deviceId) {
+    if (this.devicesCache) {
+      return this.devicesCache.find(dev => dev.deviceid === deviceId) || null;
+    }
+
     const devices = await this.getDevices();
 
     const error = _get(devices, 'error', false);

mixins/devices/getLocalIpMixin.js

@@ -0,0 +1,17 @@
+const getLocalIpMixin = {
+  /**
+   * Get local IP address from a given MAC
+   *
+   * @param device
+   * @returns {Promise<string>}
+   */
+  getLocalIp(device) {
+    const mac = device.extra.extra.staMac;
+    const arpItem = this.arpTable.find(
+      item => item.mac.toLowerCase() === mac.toLowerCase()
+    );
+    return arpItem.ip;
+  },
+};
+
+module.exports = getLocalIpMixin;

mixins/devices/saveDevicesCacheMixin.js

@@ -0,0 +1,32 @@
+const fs = require('fs');
+
+const { _get } = require('../../lib/helpers');
+
+const saveDevicesCacheMixin = {
+  /**
+   * Save devices cache file (useful for using zeroconf)
+   * @returns {Promise<string|{msg: string, error: number}|*|Device[]|{msg: string, error: number}>}
+   */
+  async saveDevicesCache(fileName = './devices-cache.json') {
+    const devices = await this.getDevices();
+
+    const error = _get(devices, 'error', false);
+
+    if (error || !devices) {
+      console.log(devices);
+      return devices;
+    }
+
+    const jsonContent = JSON.stringify(devices, null, 2);
+
+    try {
+      fs.writeFileSync(fileName, jsonContent, 'utf8');
+      return { status: 'ok', file: fileName };
+    } catch (e) {
+      console.log('An error occured while writing JSON Object to File.');
+      return { error: e.toString() };
+    }
+  },
+};
+
+module.exports = saveDevicesCacheMixin;

mixins/powerState/setDevicePowerStateMixin.js

@@ -1,7 +1,10 @@
 const { _get } = require('../../lib/helpers');
 
 const { getDeviceChannelCount } = require('../../lib/ewelink-helper');
-const { ChangeState } = require('../../classes/PowerState');
+const {
+  ChangeState,
+  ChangeStateZeroconf,
+} = require('../../classes/PowerState');
 
 const setDevicePowerState = {
   /**
@@ -53,6 +56,16 @@ const setDevicePowerState = {
       params.switch = stateToSwitch;
     }
 
+    if (this.devicesCache) {
+      return ChangeStateZeroconf.set({
+        url: this.getZeroconfUrl(device),
+        device,
+        params,
+        switches,
+        state: stateToSwitch,
+      });
+    }
+
     const actionParams = {
       apiUrl: this.getApiWebSocket(),
       at: this.at,

mixins/user/getCredentialsMixin.js

@@ -44,16 +44,6 @@ const getCredentialsMixin = {
     this.at = _get(response, 'at', '');
     return response;
   },
-
-  /**
-   * DEPRECATED: keept for backward compatibility
-   * Will be removed on version 2.0
-   *
-   * @returns {Promise<{msg: string, error: *}>}
-   */
-  async login() {
-    return this.getCredentials();
-  },
 };
 
 module.exports = getCredentialsMixin;

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "ewelink-api",
-  "version": "1.10.0",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -610,6 +610,14 @@
         "commander": "^2.11.0"
       }
     },
+    "arpping": {
+      "version": "github:skydiver/arpping#7fa7085fc55e8a0c5b3893d25505e79ba93fdb31",
+      "from": "github:skydiver/arpping",
+      "requires": {
+        "child_process": "^1.0.2",
+        "os": "^0.1.1"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -1053,6 +1061,11 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
+    "child_process": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/child_process/-/child_process-1.0.2.tgz",
+      "integrity": "sha1-sffn/HPSXn/R1FWtyU4UODAYK1o="
+    },
     "chnl": {
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/chnl/-/chnl-0.5.0.tgz",
@@ -1233,6 +1246,11 @@
         "which": "^1.2.9"
       }
     },
+    "crypto-js": {
+      "version": "3.1.9-1",
+      "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-3.1.9-1.tgz",
+      "integrity": "sha1-/aGedh/Ad+Af+/3G6f38WeiAbNg="
+    },
     "cssom": {
       "version": "0.3.8",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
@@ -2171,7 +2189,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2192,12 +2211,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -2212,17 +2233,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -2339,7 +2363,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -2351,6 +2376,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -2365,6 +2391,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -2372,12 +2399,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -2396,6 +2425,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -2476,7 +2506,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -2488,6 +2519,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -2573,7 +2605,8 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -2609,6 +2642,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -2628,6 +2662,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -2671,12 +2706,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -2768,9 +2805,9 @@
       "dev": true
     },
     "handlebars": {
-      "version": "4.2.0",
+      "version": "4.5.3",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.5.3.tgz",
-      "integrity": "sha512-Kb4xn5Qh1cxAKvQnzNWZ512DhABzyFNmsaJf3OAkWNa4NkaqWcNI8Tao8Tasi0/F4JD9oyG0YxuFyvyR57d+Gw==",
+      "integrity": "sha512-3yPecJoJHK/4c6aZhSvxOyG4vJKDshV36VHp0iVCDVh7o9w2vwi3NSnL2MMPj3YdduqaBcu7cGbggJQM0br9xA==",
       "dev": true,
       "requires": {
         "neo-async": "^2.6.0",
@@ -4417,6 +4454,11 @@
         "wordwrap": "~1.0.0"
       }
     },
+    "os": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/os/-/os-0.1.1.tgz",
+      "integrity": "sha1-IIhF6J4ZOtTZcUdLk5R3NqVtE/M="
+    },
     "os-tmpdir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
@@ -5732,16 +5774,23 @@
       }
     },
     "uglify-js": {
-      "version": "3.6.0",
+      "version": "3.7.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.7.0.tgz",
-      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
+      "integrity": "sha512-PC/ee458NEMITe1OufAjal65i6lB58R1HWMRcxwvdz1UopW0DYqlRL3xdu3IcTvTXsB02CRHykidkTRL+A3hQA==",
       "dev": true,
       "optional": true,
       "requires": {
-        "commander": "~2.20.0",
+        "commander": "~2.20.3",
         "source-map": "~0.6.1"
       },
       "dependencies": {
+        "commander": {
+          "version": "2.20.3",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+          "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+          "dev": true,
+          "optional": true
+        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ewelink-api",
-  "version": "1.10.0",
+  "version": "2.0.0",
   "description": "eWeLink API for Node.js",
   "author": "Martín M.",
   "license": "MIT",
@@ -37,6 +37,8 @@
     ]
   },
   "dependencies": {
+    "arpping": "github:skydiver/arpping",
+    "crypto-js": "^3.1.9-1",
     "delay": "^4.3.0",
     "nonce": "^1.0.4",
     "random": "^2.1.1",

test/_setup/credentials.example.js

@@ -0,0 +1,20 @@
+module.exports = {
+  // eWeLink credentials
+  email: '<your ewelink email>',
+  password: '<your ewelink password>',
+  region: '<your ewelink region>',
+
+  // zeroconf
+  localIp: '<your network ip addreess>',
+  localIpInvalid: '<an invalid network address>',
+
+  // devices
+  singleChannelDeviceId: '<your device id>',
+  deviceIdWithPower: '<your device id>',
+  deviceIdWithoutPower: '<your device id>',
+  deviceIdWithTempAndHum: '<your device id>',
+  deviceIdWithoutTempAndHum: '<your device id>',
+  fourChannelsDevice: '<your device id>',
+  outdatedFirmwareDevice: '<your device id>',
+  updatedFirmwareDevice: '<your device id>',
+};

test/_setup/credentials.json

@@ -1,13 +0,0 @@
-{
-  "email": "<your ewelink email>",
-  "password": "<your ewelink password>",
-  "region": "<your ewelink region>",
-  "singleChannelDeviceId": "<your device id>",
-  "deviceIdWithPower": "<your device id>",
-  "deviceIdWithoutPower": "<your device id>",
-  "deviceIdWithTempAndHum": "<your device id>",
-  "deviceIdWithoutTempAndHum": "<your device id>",
-  "fourChannelsDevice": "<your device id>",
-  "outdatedFirmwareDevice": "<your device id>",
-  "updatedFirmwareDevice": "<your device id>"
-}

test/_setup/expectations.js

@@ -56,7 +56,7 @@ const regionExpectations = {
 };
 
 module.exports = {
-  credentialsExpectations: credentialsExpectations,
+  credentialsExpectations,
   allDevicesExpectations,
   specificDeviceExpectations,
   rawPowerUsageExpectations,

test/env-node.spec.js

@@ -7,7 +7,7 @@ const {
   password,
   singleChannelDeviceId,
   fourChannelsDevice,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 const {
   credentialsExpectations,

test/env-serverless.spec.js

@@ -7,7 +7,7 @@ const {
   password,
   singleChannelDeviceId,
   fourChannelsDevice,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 const {
   credentialsExpectations,

test/firmware.spec.js

@@ -6,7 +6,7 @@ const {
   singleChannelDeviceId,
   outdatedFirmwareDevice,
   updatedFirmwareDevice,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 const { firmwareExpectations } = require('./_setup/expectations');
 

test/invalid-credentials.spec.js

@@ -6,7 +6,7 @@ const {
   singleChannelDeviceId,
   deviceIdWithPower,
   fourChannelsDevice,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 describe('invalid credentials', () => {
   beforeEach(async () => {

test/power-usage.spec.js

@@ -6,7 +6,7 @@ const {
   email,
   password,
   deviceIdWithPower,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 const {
   rawPowerUsageExpectations,

test/temperature-humidity.spec.js

@@ -7,7 +7,7 @@ const {
   password,
   deviceIdWithoutTempAndHum,
   deviceIdWithTempAndHum: thDevice,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 describe('current temperature and humidity: node script', () => {
   let conn;

test/user.spec.js

@@ -1,6 +1,6 @@
 const ewelink = require('../main');
 
-const { email, password, region } = require('./_setup/credentials.json');
+const { email, password, region } = require('./_setup/credentials.js');
 
 const { regionExpectations } = require('./_setup/expectations');
 

test/valid-credentials.spec.js

@@ -7,7 +7,7 @@ const {
   password,
   deviceIdWithoutPower,
   fourChannelsDevice,
-} = require('./_setup/credentials.json');
+} = require('./_setup/credentials.js');
 
 const { credentialsExpectations } = require('./_setup/expectations');
 

test/zeroconf.spec.js

@@ -0,0 +1,120 @@
+const ewelink = require('../main');
+const Zeroconf = require('../classes/Zeroconf');
+
+const {
+  email,
+  password,
+  region,
+  localIp,
+  localIpInvalid,
+} = require('./_setup/credentials.js');
+
+const { allDevicesExpectations } = require('./_setup/expectations');
+
+describe('zeroconf: save devices to cache file', () => {
+  test('can save cached devices file', async () => {
+    jest.setTimeout(30000);
+    const file = './test/_setup/devices-cache.json';
+    const conn = new ewelink({ region, email, password });
+    const result = await conn.saveDevicesCache(file);
+    expect(typeof result).toBe('object');
+    expect(result.status).toBe('ok');
+    expect(result.file).toBe(file);
+  });
+
+  test('error saving cached devices file', async () => {
+    jest.setTimeout(30000);
+    const file = '/tmp/non-existent-folder/devices-cache.json';
+    const conn = new ewelink({ region, email, password });
+    const result = await conn.saveDevicesCache(file);
+    expect(typeof result).toBe('object');
+    expect(result.error).toContain('ENOENT: no such file or directory');
+  });
+
+  test('invalid credentials trying to create cached devices file', async () => {
+    const file = '/tmp/non-existent-folder/devices-cache.json';
+    const conn = new ewelink({ email: 'invalid', password: 'credentials' });
+    const result = await conn.saveDevicesCache(file);
+    expect(typeof result).toBe('object');
+    expect(result.msg).toBe('Authentication error');
+    expect(result.error).toBe(401);
+  });
+});
+
+describe('zeroconf: save arp table to file', () => {
+  test('can save arp table file', async () => {
+    jest.setTimeout(30000);
+    const file = './test/_setup/arp-table.json';
+    const arpTable = await Zeroconf.saveArpTable({
+      ip: localIp,
+      file,
+    });
+    expect(typeof arpTable).toBe('object');
+    expect(arpTable.status).toBe('ok');
+    expect(arpTable.file).toBe(file);
+  });
+
+  test('error saving arp table file', async () => {
+    jest.setTimeout(30000);
+    const file = '/tmp/non-existent-folder/arp-table.json';
+    const arpTable = await Zeroconf.saveArpTable({
+      ip: localIp,
+      file,
+    });
+    expect(typeof arpTable).toBe('object');
+    expect(arpTable.error).toContain('ENOENT: no such file or directory');
+  });
+
+  test('error saving arp table file with invalid local network', async () => {
+    jest.setTimeout(30000);
+    const file = './test/_setup/arp-table.json';
+    const arpTable = await Zeroconf.saveArpTable({
+      ip: localIpInvalid,
+      file,
+    });
+    expect(typeof arpTable).toBe('object');
+    expect(arpTable.error).toBe('Error: range must not be empty');
+  });
+});
+
+describe('zeroconf: load devices to cache file', () => {
+  test('can load cached devices file', async () => {
+    jest.setTimeout(30000);
+    const conn = new ewelink({ region, email, password });
+    const devices = await conn.getDevices();
+    const devicesCache = await Zeroconf.loadCachedDevices(
+      './test/_setup/devices-cache.json'
+    );
+    expect(typeof devicesCache).toBe('object');
+    expect(devicesCache.length).toBe(devices.length);
+    expect(devices[0]).toMatchObject(allDevicesExpectations);
+  });
+
+  test('error trying to load invalidcached devices file', async () => {
+    jest.setTimeout(30000);
+    const devicesCache = await Zeroconf.loadCachedDevices('file-not-found');
+    expect(typeof devicesCache).toBe('object');
+    expect(devicesCache.error).toContain('ENOENT: no such file or directory');
+  });
+});
+
+describe('zeroconf: load arp table file', () => {
+  test('can load arp table file', async () => {
+    const arpTable = await Zeroconf.loadArpTable(
+      './test/_setup/arp-table.json'
+    );
+    expect(typeof arpTable).toBe('object');
+    expect(arpTable[0]).toMatchObject({
+      ip: expect.any(String),
+      mac: expect.any(String),
+    });
+  });
+
+  test('error trying to load invalidcached devices file', async () => {
+    const arpTable = await Zeroconf.loadArpTable(
+      '/tmp/non-existent-folder/arp-table.json'
+    );
+    expect(typeof arpTable).toBe('object');
+    expect(arpTable.error).toContain('ENOENT: no such file or directory');
+  });
+});