Cannot display values of external check data items on the map

[allibek]

Created script for measure inbound trafic(by the way not sure if its right) /usr/lib/zabbix/externalscripts/ifin.sh

index=`snmpwalk -Oqv -v 2c -c ****** $1 IP-MIB::ipAdEntIfIndex.$1`
data1=`snmpwalk -Oqv -v 2c -c ****** $1 IF-MIB::ifHCInOctets.$index`
sleep 5
data2=`snmpwalk -Oqv -v 2c -c ****** $1 IF-MIB::ifHCInOctets.$index`
echo $(((8 * ($data2-$data1)) / 5))

Created tamplate ifLoad with data item in and key ifin.sh["{HOST.CONN}"].
Data are gathering and i even can build graphs. But i cannot display it on the map.
Tryed:
{ifLoad:ifin.sh["{HOST.CONN}"].last()}
{ifLoad:ifin.sh["{HOST.CONN}"].last(0)}
{{HOST.CONN}:ifLoad:ifin.sh["{HOST.CONN}"].last()}
{{HOST.CONN}:ifLoad:ifin.sh["{HOST.CONN}"].last(0)}
{{HOST.CONN}:ifin.sh["{HOST.CONN}"].last()}
{{HOST.CONN}:ifin.sh["{HOST.CONN}"].last(0)}
{{HOST.HOST}:ifin.sh["{HOST.CONN}"].last(0)}
{{HOST.HOST}:ifin.sh["{HOST.HOST}"].last(0)}
How to do it right?
NEED HELP!!!!!

[kloczek]

Why you are using external checks to collect data over SNMP?
You have SNMP item type.

[allibek]

Hi kloczek! It seems there is no such MIB or OID which can display load on the routers port. There is only ifInOctets. So to calculate usage of port in bits per seconds you need delta(ifInOctets)/delta(time). If you know how to do it with SNMP item type please write.