$labelPrefix = '1.3.6.1.4.1.2620.1.48.29.1.2.'
$valuePrefix = '1.3.6.1.4.1.2620.1.48.29.1.3.'
$valuePrefix2 = '1.3.6.1.4.1.2620.1.48.29.1.4.'
$valuePrefix3 = '1.3.6.1.4.1.2620.1.48.29.1.5.'
$snmpTree = '.1.3.6.1.4.1.2620.1.48.29.1'

$WalkRequest = @{
    UserName   = 'SNMPv3Username'
    Target     = 'SecGroupIPAddress'
    OID        =  $snmpTree
    AuthType   = 'SHA256'
    AuthSecret = 'MyAuthSecret'
    PrivType   = 'AES128'
    PrivSecret = 'MyPrivSecret'
}
Write-Host "Performing SNMP Query"
$s = Invoke-SNMPv3Walk @WalkRequest
Write-Host "Filtering Data"
filter tableWithPrefix($prefix) {
    $_ | ? { $_.OID.StartsWith($prefix) } `
    | % { $TableIndex = $_.OID.Split('.')[-2]; $_ | Add-Member -NotePropertyName TableIndex -NotePropertyValue ([int]$TableIndex); return $_ } 
}

function indexTableByTableIndex($table) {
    return $table |  Foreach {$indexedTable=@{}} {$indexedTable[$_.TableIndex]= $_} {$indexedTable} 
}

Write-Host "Converting data to table format"
$labels = $s | tableWithPrefix($labelPrefix) 
$values = $s | tableWithPrefix($valuePrefix)
$values2 = $s | tableWithPrefix($valuePrefix2)
$values3 = $s | tableWithPrefix($valuePrefix3)
$indexedValues = indexTableByTableIndex($values)

$res = [ordered]@{}
$resArr = [System.Collections.ArrayList]@()

Write-Host "Building output"
foreach ($row in $labels) {
    # notice that TableIndex goes from 0, but arrays are indexed from 0!
    # two approaches - depend on array order or index table by TableIndex first
    #Write-Host $row.OID, $values[$row.TableIndex-1].OID, $indexedValues[$row.TableIndex].OID
    # values (will work for U)
    $res[$row.Value] = $values[$row.TableIndex-1].Value
    #Write-Host $row.Value, $values[$row.TableIndex-1].Value # , $indexedValues[$row.TableIndex].Value
    $resArr.Add([PSCustomObject]@{Name=$row.Value; Value1=$values[$row.TableIndex-1].Value; Value2=$values2[$row.TableIndex-1].Value; Value3=$values3[$row.TableIndex-1].Value}) | Out-Null
}
Write-Host "Done"
$res = [PSCustomObject]$res 

# $res | ConvertTo-Json | out-file formartin.json
Write-Host "Formatting Results table:"
$resArr | ft