Write a C++

program that simulates an IoT (Internet

of Things) controller. Any number of IoT devices can connect to this controller and

report their status. The controller will thus have a complete picture of all the IoT

devices that have reported to it, the current status of those devices and when last the

status changed/updated.

To simulate the messages sent by the various IoT devices, a text le called device data.txt

is provided that contains a number of device messages sent, with each line representing

a distinct message. Each message contains a device name, a status value and a Unix

epoch value which are separated by commas. Your C++ program will read this file

line by line and sent the contained message to a new child process. The child process will

separate the message into device name, status value and epoch value, convert the epoch

to a date and time string and send the data back to the parent process. The parent

process will use this data to create and maintain a IoT device list with associated status

value and time.

Implementation:

The following steps show how your program should work:

1. Your program opens the provided IoT device data input le.

2. It then reads the input le line by line.

3. For each input line, it creates a new child process with the fork() function.

4. The parent process then sends the input line to the child process via a pipe.

5. The child process transforms the input line to data values and sends them back

to the parent via a pipe.

6. The parent process uses the received data to update an IoT devices status list.

7. When the reading of the input le is complete, the program prints the nal IoT

devices status list.

IMPORTANT:

You have to communicate by using pipes and the read() and write() functions.

You have to use the fork() function to create child processes.

You are not allowed to execute other commands from within your program by

using functions like execve() and friends.

You have to print verbose output to clearly show what task each process performs.

Your program should either use the le device data.txt or ask for a device data

file name.

Contents of:

device data.txt

FrontDoor,Closed,1532700000 LivingLight,Off,1532700000 LivingTemp,19,1532700000 LivingTemp,18.5,1532703600 FrontDoor,Open,1532707200 LivingTemp,18,1532707200 LivingLight,On,1532707203 FrontDoor,Closed,1532707205 LivingTemp,18.1,1532710800

EXAMPLE OUTPUT:

Parent sent file line 8

child received message line: FrontDoor,Closed,152707205

Child sent device: FrontDoor

Child sent value: Closed

Child sent time: 18:00:05 27/07/2018

Parent received update for FrontDoor: Closed at 18:00:05 27/07/2018

Parent sent file line 9

Child received message line: LivingTemp,18.1,1532710800

Child sent device: LivingTemp

Child send value: 18.1

Child sent time: 19:00:00 27/07/2018

Parent received update for LivingTemp: 18.1 at 19:00:00 27/07/2018

=========

Device List:

=========

FrontDoor Closed @ 18:00:05 27/07/2018

LivingLight: On @ 18:00:03 27/07/2018

LivingTemp: 18.1 @ 19:00:00 27/07/2018