#!/bin/bash
    #

    # CONFIG
    PortName="ttyUSB0"
    BaudRate=9600

    # The app begins.
    MODULE="AOSRService"

    # Check if some commands exist.
    for CMDAPP in "stty" "echo" "hash" "date" "cat" "ps" "grep" "awk" "xargs" "kill"
    do
      if ! hash "$CMDAPP" 2>/dev/null
      then
          echo "`date`: $MODULE ended without '$CMDAPP' command." >> ERROR.log
          echo "`date`: $MODULE ended without '$CMDAPP' command."
          exit
      fi
    done

    # Call function to verify the output of commands.
    CheckOutput() {
        if [ $? -eq 0 ]
        then
             echo "`date`: $1" >> ACTIONS.log

             # Search and kill listen process's.
             ps -ef | grep cat | grep -v "grep" | awk '{print $2}' | xargs kill;
        else
             echo "`date`: $1" >> ERROR.log
        fi
    }

    # Connect to the specified device instead of stdin.
    stty -F /dev/$PortName $BaudRate cs8 -cstopb -parenb -icanon min 1 time 1

    # Run in background the process that will listen to the output.
    cat -v /dev/$PortName > output 2>&1 &

    # Turn on/off and receive status of the relays.
    case "$1" in
                   "1:1")
                          echo -e '\xff\x01\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "1:0")
                          echo -e '\xff\x01\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "2:1")
                          echo -e '\xff\x02\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "2:0")
                          echo -e '\xff\x02\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "3:1")
                          echo -e '\xff\x03\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "3:0")
                          echo -e '\xff\x03\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "4:1")
                          echo -e '\xff\x04\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "4:0")
                          echo -e '\xff\x04\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "5:1")
                          echo -e '\xff\x05\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "5:0")
                          echo -e '\xff\x05\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "6:1")
                          echo -e '\xff\x06\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "6:0")
                          echo -e '\xff\x06\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "7:1")
                          echo -e '\xff\x07\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "7:0")
                          echo -e '\xff\x07\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "8:1")
                          echo -e '\xff\x08\x01' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "8:0")
                          echo -e '\xff\x08\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   "status-all")
                          echo -e '\xff\x09\x00' > /dev/$PortName
                          CheckOutput $1
                          ;;
                   *)
                          echo "Select Case problem."
                          echo "Usage: $MODULE <param>"
                          echo "`date`: Select Case problem." >> ERROR.log
                          exit 1
    esac

    # Exit app.
    exit