#$last_value{ $id } = $payload;
        $last_value{ $id } ||= {};
	if(defined $last_value{ $id } )
	{
		$last_value{ $id }{COUNT} += 1;
                # If we last saw something from this device, note the time difference
                if( $last_value{ $id }{TIME} ) {
        	    $time_diff = $now_milli - $last_value{ $id }{TIME};
                } else {
                    # Otherwise, print 0
                    $time_diff= 0;
                };