NodeJS Trackle Wrapper

Table of contents

• installation
• methods
• Get a Device ID and a private key
• example
• Attention

Installation

npm install trackle-library-nodejs

Get a Device ID and a private key

• Create an account on Trackle Cloud (https://trackle.cloud/)
• Open "My Devices" section from the drawer
• Click the button "Claim a device"
• Select the link "I don't have a device id", then Continue
• The Device Id will be shown on the screen and the private key file will be download with name <device_id>.der where <device_id> is Device ID taken from Trackle.

Implemented methods

To see the implemented methods you can check on this link example or import trackle from the installed library and check it there, with the library you also will import

• Log_Level
• Function_PermissionDef
• Data_TypeDef
• Ota_Method
• Connection_Type
• Event_Type
• Event_Flags this are all enum declareted types that will help you with the values that function expects

Example

import fs from "fs";

import trackle, {
  Log_Level,
  Function_PermissionDef,
  Data_TypeDef,
  Connection_Type,
  Event_Type,
  Event_Flags
} from "trackle-library-nodejs";

// Define callbacks

const getMillis = () => {
  const date = new Date();
  const ms: number = date.getTime();
  return ms;
};

const setLog = (msg: string, level: number, category: string): void => {
  if (category.length === 0) {
    console.log(`[${level}] [] ${msg}`);
  } else {
    console.log(`[${level}] [${category}] ${msg}`);
  }
};

// Post callbacks declaration (creating the functions that will be called from user in the online platform)

const post1 = (name: string): number => {
  console.log("called post1 : " + name);
  console.log("Post1 - Pippo");
  return 1;
}

const post2 = (name: string): number => {
  if (name) {
    console.log("Post2 - Pluto");
    return 0;
  }

  return -1;
};

const postSuccess = (name: string): number => {
  console.log(`Richiamata callback postSuccess, arg: ${name}`);
  return 1;
}

const postFailure = (name: string): number => {
  console.log(`Richiamata callback postFailure, arg: ${name}`);
  return -1;
};

// Get callback declaration (creating the functions that will be called from user in the online platform)

const getString = (name: string): string => {
  console.log("Called getString : " + name);
  if (name) {
    console.log("getString - ");
    return "Hello";
  }

  return "World";
};

const getChar = (name: string): string => {
  console.log("Called getChar : " + name);
  if (name) {
    console.log("getChar - ");
    return "C";
  }

  return "a";
};

const getInt = (name: string): number => {
  console.log("Called getInt : " + name);
  if (name) {
    console.log("getInt - ");
    return 5678;
  }

  return 1234;
};

const getBoolean = (name: string): boolean => {
  console.log("Called getBoolean : " + name);
  if (name) {
    console.log("getBoolean - ");
    return true;
  }

  return false;
};

const getDouble = (name: string): number => {
  console.log("Called getDouble : " + name);
  if (name) {
    console.log("getDouble - ");
    return 1.4563333;
  }

  return 0.4567812;
};

const getJson = (name: string): string => {
  console.log("Called getJson : " + name);
  if (name) {
    console.log("getJson - ");
    return JSON.stringify({ name: "pippo", surname: "pluto" });
  }

  return JSON.stringify({ name: "Hello", surname: "World" });
};

const systemTimeCallback = (
  time: number,
  param: number,
  data: Buffer | undefined
): void => {
  console.log(time);

};

const completedPublishCallback = (
  error: number,
  callbackData?: number
): void => {
  console.log("msg key: " + callbackData)
  console.log("error: " + error)

};

const UpdateStateCallback = (
  function_key: string,
  arg: string
): number => {
  console.log("key value: " + function_key)
  console.log("arg: " + arg)
  return -1;

};

const ConnectionStatusCallback = (
  status: number,
) => {
  if (firstConnect && status === 2) {
    trackle.publish(
      "First",
      "Hello",
      30,
      Event_Type.PUBLIC,
      Event_Flags.WITH_ACK,
      1
    );
    firstConnect = false;
  }
};

const systemRebootCallback = (data: string) => {
  console.log("Reboot request ignored!");

};

let prevPubMillis = 0;
let msg_key = 1;
let firstConnect = true;
const PRIVATE_KEY = fs.readFileSync("Path_To_Your_.der_Key_file");

trackle.setMillis(getMillis);
trackle.setLogLevel(Log_Level.TRACKLE_INFO);
trackle.setLogCallback(setLog);

// Set cloud credentials
trackle.setDeviceId("Your_Device_ID");
trackle.setKeys(PRIVATE_KEY);

trackle.setFirmwareVersion(1);

trackle.setConnectionType(Connection_Type.CONNECTION_TYPE_WIFI);

// set system Callbacks

trackle.setSystemTimeCallback(systemTimeCallback);
trackle.setSystemRebootCallback(systemRebootCallback);
trackle.setCompletedPublishCallback(completedPublishCallback);
trackle.setUpdateStateCallback(UpdateStateCallback);

// Registering POST functions callable from cloud

trackle.post(
  "post1",
  post1,
  Function_PermissionDef.ALL_USERS
);
trackle.post(
  "post2",
  post2,
  Function_PermissionDef.ALL_USERS
);
trackle.post(
  "postSuccess",
  postSuccess,
  Function_PermissionDef.ALL_USERS
);
trackle.post(
  "postFailure",
  postFailure,
  Function_PermissionDef.ALL_USERS
);


// Registering GET functions callable from cloud

trackle.get("getInt", getInt, Data_TypeDef.VAR_INT);
trackle.get("getString", getString, Data_TypeDef.VAR_STRING);
trackle.get("getDouble", getDouble, Data_TypeDef.VAR_DOUBLE);
trackle.get("getChar", getChar, Data_TypeDef.VAR_CHAR);
trackle.get("getJson", getJson, Data_TypeDef.VAR_JSON);
trackle.get("getBool", getBoolean, Data_TypeDef.VAR_BOOLEAN);

trackle.setConnectionStatusCallback(ConnectionStatusCallback)

// Connection to trackle
trackle.connect();

console.log("Startup completed. Running...");
console.log("Starting Loop...");

setInterval(async () => {
  trackle.loop();

  // Every 5 seconds make a publish

  if (getMillis() - prevPubMillis > 5000) {

    trackle.publish(
      "greetings",
      "Hello, World!",
      30,
      Event_Type.PUBLIC,
      Event_Flags.WITH_ACK,
      msg_key
    );
    msg_key++;
    prevPubMillis = new Date().getTime();
  }
}, 10);

Attention

The POST and GET methods are implemented to be synchronous, so if you want to implement a JavaScript function with them, you should NOT return a Promise.