diff --git a/lib/knot/protocol.rb b/lib/knot/protocol.rb
index 98bf7c6..cf1abf2 100644
--- a/lib/knot/protocol.rb
+++ b/lib/knot/protocol.rb
@@ -1,5 +1,7 @@
 require 'iounpack'
-require 'stringio'
+require 'pathname'
+require 'socket'
+require 'logger'
 require_relative 'errors'
 
 module Knot
@@ -72,71 +74,93 @@ end
 #	end
 #end
 
-module Knot::Protocol::Idx
-	class Id
-		include Comparable
-		attr_reader :name, :code, :cname, :description
+class Knot::Protocol::Code
+	include Comparable
+	attr_reader :name, :code, :cname, :description
 
-		def initialize name, code, cname, description
-			raise ArgumentError, "Expecting Symbol for #{self.class.name} instead of: #{name.inspect}"   unless Symbol === name
-			raise ArgumentError, "Expecting Integer for #{self.class.name} instead of: #{code.inspect}"  unless Integer === code
-			@name, @code, @cname, @description = name, code, cname, description
-			freeze
-		end
-
-		def === x
-			case x
-			when self.class then self == x
-			when Symbol then @name == x
-			when String then @name == x.to_sym
-			when Integer then @code == x
-			else nil
-			end
-		end
-
-		def <=>( x)  @id <=> x.id  end
-		def to_s()  @name.to_s  end
-		def to_sym()  @name  end
-		def to_i()  @code  end
+	def initialize name, code, cname, description
+		raise ArgumentError, "Expecting Symbol for #{self.class.name} instead of: #{name.inspect}"   unless Symbol === name
+		raise ArgumentError, "Expecting Integer for #{self.class.name} instead of: #{code.inspect}"  unless Integer === code
+		@name, @code, @cname, @description = name, code, cname, description
+		freeze
 	end
 
-	Idx = [
-		Id.new( :command, 0x10, :CMD,     'Control command name.'),
-		Id.new( :flags,   0x11, :FLAGS,   'Control command flags.'),
-		Id.new( :error,   0x12, :ERROR,   'Error message.'),
-		Id.new( :section, 0x13, :SECTION, 'Configuration section name.'),
-		Id.new( :item,    0x14, :ITEM,    'Configuration item name.'),
-		Id.new( :id,      0x15, :ID,      'Congiguration item identifier.'),
-		Id.new( :zone,    0x16, :ZONE,    'Zone name.'),
-		Id.new( :owner,   0x17, :OWNER,   'Zone record owner'),
-		Id.new( :ttl,     0x18, :TTL,     'Zone record TTL.'),
-		Id.new( :type,    0x19, :TYPE,    'Zone record type name.'),
-		Id.new( :data,    0x1a, :DATA,    'Configuration item/zone record data.'),
-		Id.new( :filter,  0x1b, :FILTER,  'An option or a filter for output data processing.'),
+	def === x
+		case x
+		when self.class then @id   == x.id
+		when Symbol     then @name == x
+		when String     then @name == x.to_sym
+		when Integer    then @code == x
+		else nil
+		end
+	end
+
+	def <=>( x)  @id <=> x.id  end
+	def to_s()   @name.to_s  end
+	def to_sym() @name  end
+	def to_i()   @code  end
+end
+
+module Knot::Protocol::Codes
+	include Enumerable
+	def [] k
+		case k
+		when Symbol
+			self::Name[k] or raise Knot::Errors::EINVAL, "Unknown Codes: #{k}"
+		when Integer
+			self::Code[k] or raise Knot::Errors::EINVAL, "Unknown Codes: #{k}"
+		else
+			raise ArgumentError, "Unknown Codes-Type: #{k}"
+		end
+	end
+
+	def each &exe
+		block_given? ? self::Codes.each( &exe) : self::Codes.to_enum( :each)
+	end
+end
+
+module Knot::Protocol::Idx
+	extend Knot::Protocol::Codes
+
+	Codes = [
+		Knot::Protocol::Code.new( :command, 0x10, :CMD,     'Control command name.'),
+		Knot::Protocol::Code.new( :flags,   0x11, :FLAGS,   'Control command flags.'),
+		Knot::Protocol::Code.new( :error,   0x12, :ERROR,   'Error message.'),
+		Knot::Protocol::Code.new( :section, 0x13, :SECTION, 'Configuration section name.'),
+		Knot::Protocol::Code.new( :item,    0x14, :ITEM,    'Configuration item name.'),
+		Knot::Protocol::Code.new( :id,      0x15, :ID,      'Congiguration item identifier.'),
+		Knot::Protocol::Code.new( :zone,    0x16, :ZONE,    'Zone name.'),
+		Knot::Protocol::Code.new( :owner,   0x17, :OWNER,   'Zone record owner'),
+		Knot::Protocol::Code.new( :ttl,     0x18, :TTL,     'Zone record TTL.'),
+		Knot::Protocol::Code.new( :type,    0x19, :TYPE,    'Zone record type name.'),
+		Knot::Protocol::Code.new( :data,    0x1a, :DATA,    'Configuration item/zone record data.'),
+		Knot::Protocol::Code.new( :filter,  0x1b, :FILTER,  'An option or a filter for output data processing.'),
 	]
 	Name = {}
 	Code = {}
 
-	Idx.each do |id|
+	Codes.each do |id|
 		Code[id.to_i] = id
 		Name[id.to_sym] = id
 	end
+end
 
-	class <<self
-		def [] k
-			case k
-			when Symbol
-				Name[k] or raise Knot::Errors::EINVAL, "Unknown Idx: #{k}"
-			when Integer
-				Code[k] or raise Knot::Errors::EINVAL, "Unknown Idx: #{k}"
-			else
-				raise ArgumentError, "Unknown Idx-Type: #{k}"
-			end
-		end
+module Knot::Protocol::Types
+	extend Knot::Protocol::Codes
 
-		def each &exe
-			block_given? ? Idx.each( &exe) : Idx.to_enum( :each)
-		end
+	Codes = [
+		Knot::Protocol::Code.new( :end,   0x00, :END,   'Type END.'),
+		Knot::Protocol::Code.new( :data,  0x01, :DATA,  'Type DATA.'),
+		Knot::Protocol::Code.new( :extra, 0x02, :EXTRA, 'Type EXTRA.'),
+		Knot::Protocol::Code.new( :block, 0x03, :BLOCK, 'Type BLOCK.'),
+	]
+
+	Name = {}
+	Code = {}
+
+	Codes.each do |id|
+		Code[id.to_i] = id
+		Name[id.to_sym] = id
 	end
 end
 
@@ -164,11 +188,11 @@ class Knot::Protocol
 		#sock.write [1].pack( 'c')
 		data[:flags] ||= ''
 		ds =
-			Idx::Idx.
+			Idx.
 				select {|n| data[n.to_sym] }.
 				map {|n| v = data[n.to_sym].to_s.b; [n.to_i, v.size, v ] }
-		s = (ds.flatten+[3]).pack( ('c na*'*ds.length)+'c').b
-		#Idx::Idx.each do |n|
+		s = [Types[:data].to_i, ds, Types[:block].to_i].flatten.pack( "c #{'c na*'*ds.length} c").b
+		#Idx.each do |n|
 		#	v = data[n.to_sym]&.to_s&.b
 		#	sock.write [n.to_i, v.size, v].pack( 'c na*')  if v
 		#end
@@ -211,16 +235,16 @@ class Knot::Protocol
 		loop do
 			t = sock.unpack1 'c'
 			case t
-			when 0, 3
+			when Knot::Protocol::Types[:end], Knot::Protocol::Types[:block]
 				return ret
-			when 1, 2
+			when Knot::Protocol::Types[:data], Knot::Protocol::Types[:extra]
 				type = t
 				ret.push( r = {})
 			else
 				raise Knot::Errors::EINVAL, "Missing Type before: #{t}"  if ret.empty?
-				i = Idx::Idx[t - 0x10] or raise Knot::Errors::EINVAL, "Unknown index: #{t-0x10}"
+				i = Idx[t] or raise Knot::Errors::EINVAL, "Unknown index: #{t}"
 				l = sock.unpack1 'n'
-				r[i] = sock.read( l)
+				r[i.to_sym] = sock.read( l)
 			end
 		end
 	ensure