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New commands to turn off nodes can be added to the command library of NetSim CLI Interpreter and functions can be defined to validate and execute the commands. Consider the following command to turn off a node:

turnoff <DEVICE_NAME>

which takes the device_name as a parameter along with it and uses it to turn a specific node from ON to OFF state.

A new file ZigBee_Commands.c is added to the CLIInterpretor Project, which contains the following source code:

#include "main.h"
#include <signal.h>
#include "CLI.h"
#include "../ZigBee/802_15_4.h"

bool validate_turn_off_device_command(ptrCLIENTINFO info, ptrCOMMANDARRAY command, int index)
{
    if (command->length - index < 2)
    {
        send_message(info, "USAGE: turnoff deviceName\n");
        return false;
    }

    if (_stricmp(command->commands[index], "turnoff"))
        return false;

    if (!isCommandAsDeviceName(command->commands[index + 1]))
    {

        send_message(info, "%s is not a valid device name.\n",
            command->commands[index + 1]);
        return false;

    }
    return true;
}

void execute_turn_off_device_command(ptrCLIENTINFO info, ptrCOMMANDARRAY command, int index, NETSIM_ID d)
{
    NETSIM_ID dest;
    if (isCommandAsDeviceName(command->commands[index + 1]))
    {
        dest = fn_NetSim_Stack_GetDeviceId_asName(command->commands[index + 1]);
        fn_NetSim_ZigBee_turn_off_node(d);
        send_message(info, "OK!\n");
        return;
    }
}

Further modifications are done to the existing validate_comand() function that is part of the SimulationCommand.c file to make calls to the functions newly added in the ZigBee_Commands.c file as shown below:

bool validate_command(ptrCLIENTINFO info, ptrCOMMANDARRAY command)
{
	int index = 0;
	if (!info->promptString)
	{
		if (isCommandAsDeviceName(command->commands[0]))
			index = 1;

		if (!_stricmp(command->commands[index], "route"))
			return validate_route_command(info, command, index);

		if (!_stricmp(command->commands[index], "acl"))
			return validate_acl_command(info, command, index);

		if (!_stricmp(command->commands[index], CMD_ACLCONFIG))
			return true;

		if (!_stricmp(command->commands[index], "ping"))
			return validate_ping_command(info, command, index);

		if (!_stricmp(command->commands[index], "turnoff"))
			return validate_turn_off_device_command(info, command, index);
	}
	else
	{
		if (strstr(info->promptString, CMD_ACLCONFIG))
			return validate_aclconfig_command(info, command, index);
	}

	send_message(info, "%s command is not a valid command.\n",
				 command->commands[index]);
	return false;
}

And also modifications are done to the existing execute_command() function that is part of the SimulationCommand.c file to make calls to the functions newly added in the ZigBee_Commands.c file as shown below:

void execute_command(ptrCLIENTINFO info, ptrCOMMANDARRAY command, NETSIM_ID d)
{
	int index = 0;
	if (info->promptString)
	{ 
		if (strstr(info->promptString, CMD_ACLCONFIG))
			execute_prompt_aclconfig_command(info, command, index, d);
	}
	else
	{
		if (isCommandAsDeviceName(command->commands[0]))
		{
			d = fn_NetSim_Stack_GetDeviceId_asName(command->commands[0]);
			index = 1;
		}

		if (!_stricmp(command->commands[index], "route"))
			execute_route_command(info, command, index, d);
		else if (!_stricmp(command->commands[index], "ACL"))
			execute_acl_command(info, command, index, d);
		else if (!_stricmp(command->commands[index], "ACLCONFIG"))
			execute_aclconfig_command(info, command, index, d);
		else if (!_stricmp(command->commands[index], "ping"))
			execute_ping_command(info, command, index, d);
		else if (!_stricmp(command->commands[index], "turnoff"))
			execute_turn_off_device_command(info, command, index, d);
	}

}

Changes are done in the ZigBee Source code project:

To the ChangeRadioState.c file of ZigBee source code project a new function fn_NetSim_ZigBee_turn_off_node() has been added as shown below:

_declspec(dllexport) int fn_NetSim_ZigBee_turn_off_node(NETSIM_ID nDeviceId)
{
  ptrIEEE802_15_4_PHY_VAR phy = WSN_PHY(nDeviceId);
  phy->nRadioState = RX_OFF;
  WSN_MAC(nDeviceId)->nNodeStatus = OFF;
  return 0;
}

# An example script to send client request to NetSim server using socket programming in Python
import socket # for socket
import sys
import time

#----------------------Socket code-----------------------
try:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    print ("Socket successfully created.")
except socket.error as err:
    print ("Socket creation failed with error %s" %(err))

# default port for socket
port = 8999

try:
    host_ip = socket.gethostbyname('127.0.0.1')
except socket.gaierror:
    # this means could not resolve the host
    print ("Error resolving host.")
    sys.exit()

# connecting to the server
s.connect((host_ip, port))
print ("Connection established to NetSim.")

#print ('each = ', each)

name = 'Wireless_Sensor_3'
name = name + '\0'
s.send(name.encode())

command = 'turnoff Wireless_Sensor_3'
command = command + '\0'
s.send(command.encode())

resp = s.recv(1024).decode('utf-8')
cont = '__continue__'
while cont not in resp:
    resp = resp + s.recv(1024).decode('utf-8')

print ("Received:", resp)

s.close()