OpenWRT ESP relay control

control_irrigation.sh

#!/bin/sh
# /usb/bin/control_irrigation.sh
# Don't forget to: chmod +x /usb/bin/control_irrigation.sh
command=$1
channel=$2
IP=$(cat /tmp/dhcp.leases | grep ESP |cut -d " " -f 3| awk '{print $1}')

echo $1 on channel $2 on IP $IP

if [ $1 == 'start' ]
then
    if [ $2 == 4 ]
    then
        echo -e '\xA0\x04\x01\xA5' | nc $IP 8080
    fi
    if [ $2 == 3 ]
    then
        echo -e '\xA0\x03\x01\xA4' | nc $IP 8080
    fi
    if [ $2 == 2 ]
    then
        echo -e '\xA0\x02\x01\xA3' | nc $IP 8080
    fi
    if [ $2 == 1 ]
    then
        echo -e '\xA0\x01\x01\xA2' | nc $IP 8080
    fi
fi

if [ $1 == 'stop' ]
then
    if [ $2 == 4 ]
    then
        echo -e '\xA0\x04\x00\xA4' | nc $IP 8080
    fi
    if [ $2 == 3 ]
    then
        echo -e '\xA0\x03\x00\xA3' | nc $IP 8080
    fi
    if [ $2 == 2 ]
    then
        echo -e '\xA0\x02\x00\xA2' | nc $IP 8080
    fi
    if [ $2 == 1 ]
    then
        echo -e '\xA0\x01\x00\xA1' | nc $IP 8080
    fi
fi

crontabs

# etc/crontabs/root
0 4 * * * control_irrigation.sh start 1
25 4 * * * control_irrigation.sh stop 1
25 4 * * * control_irrigation.sh start 2
50 4 * * * control_irrigation.sh stop 2
50 4 * * * control_irrigation.sh start 3
15 5 * * * control_irrigation.sh stop 3
15 5 * * * control_irrigation.sh start 4
40 5 * * * control_irrigation.sh stop 4