snmp_extend_oid (){
  oid=$1; tag=$2;
  taglen=$(expr length $tag)
  tag_oid=$(
             echo "${tag}"| sed 's/\(.\)/\1\n/g'| while read char ;do
               if [ ! -z "${char}" ];then
                 echo  -n  .
                 echo  -n $(( ( 256 + $(printf '%d' "'$char"))%256 ));
               fi
             done
           )
  echo ${oid}.4.1.2.${taglen}${tag_oid}.1
}
swalk eir $(snmp_extend_oid .1.3.6.1.4.1.32372.1.1.2.1.1.1.1   w.time)