I copied the sample sockread from the help files, because the webpage is very simple there was no need to do much to it.
Code:
on 1:sockread:[color:red]testing[/color]:{
  if ($sockerr > 0) return
  :nextread
  sockread %temp
  if ($sockbr == 0) return
  if (%temp == $null) %temp = -
  [color:red]echo 4 %temp[/color]
  goto nextread
}


I only needed to change those red bits to get what the OP asked for.