diff --git a/src/ipc/client.cr b/src/ipc/client.cr
index 31960dc..4f2dd8c 100644
--- a/src/ipc/client.cr
+++ b/src/ipc/client.cr
@@ -19,6 +19,10 @@ class IPC::Client < IPC::Context
 		at_exit { close }
 	end
 
+	def fd
+		@server_fd
+	end
+
 	def read
 		unless (fd = @server_fd).nil?
 			message = LibIPC::Message.new
diff --git a/src/ipc/context.cr b/src/ipc/context.cr
index 1b94a4a..20758ef 100644
--- a/src/ipc/context.cr
+++ b/src/ipc/context.cr
@@ -40,13 +40,13 @@ class IPC::Context
 		end
 	end
 
-	def wait_event(&block) : IPC::Event::Events | Exception
+	def wait_event : IPC::Event::Events | Exception
 		event = LibIPC::Event.new
 
 		r = LibIPC.ipc_wait_event self.pointer, pointerof(event), pointerof(@timer)
 		if r.error_code != 0
 			m = String.new r.error_message.to_slice
-			yield IPC::Exception.new "error waiting for a new event: #{m}"
+			return IPC::Exception.new "error waiting for a new event: #{m}"
 		end
 
 		eventtype = event.type.unsafe_as(LibIPC::EventType)
@@ -88,32 +88,55 @@ class IPC::Context
 				@timer = @base_timer
 			end
 
-			yield wait_event &block
+			break if yield wait_event
 		end
 	end
 
+	def send_now(message : LibIPC::Message)
+		r = LibIPC.ipc_write_fd(message.fd, pointerof(message))
+		if r.error_code != 0
+			m = String.new r.error_message.to_slice
+			raise Exception.new "error writing a message: #{m}"
+		end
+	end
+
+	def send_now(message : IPC::Message)
+		send_now fd: message.fd, utype: message.utype, payload: message.payload
+	end
+
+	def send_now(fd : Int32, utype : UInt8, payload : Bytes)
+		message = LibIPC::Message.new fd: fd,
+			type: LibIPC::MessageType::Data.to_u8,
+			user_type: utype,
+			length: payload.bytesize,
+			payload: payload.to_unsafe
+		send_now message
+	end
+
+	def send(message : LibIPC::Message)
+		r = LibIPC.ipc_write(self.pointer, pointerof(message))
+		if r.error_code != 0
+			m = String.new r.error_message.to_slice
+			raise Exception.new "error writing a message: #{m}"
+		end
+	end
+	def send(message : IPC::Message)
+		send fd: message.fd, utype: message.utype, payload: message.payload
+	end
+
 	def send(fd : Int32, utype : UInt8, payload : Bytes)
 		message = LibIPC::Message.new fd: fd,
 			type: LibIPC::MessageType::Data.to_u8,
 			user_type: utype,
 			length: payload.bytesize,
 			payload: payload.to_unsafe
-
-		r = LibIPC.ipc_write(self.pointer, pointerof(message))
-		if r.error_code != 0
-			m = String.new r.error_message.to_slice
-			raise Exception.new "error writing a message: #{m}"
-		end
+		send message
 	end
 
 	def send(fd : Int32, utype : UInt8, payload : String)
 		send(fd, utype, Bytes.new(payload.to_unsafe, payload.bytesize))
 	end
 
-	def send(message : IPC::Message)
-		send(message.fd, message.utype, message.payload)
-	end
-
 	def read(index : UInt32)
 		message = LibIPC::Message.new
 		r = LibIPC.ipc_read(self.pointer, index, pointerof(message))
@@ -130,11 +153,6 @@ class IPC::Context
 		pointerof(@context)
 	end
 
-	# sanitizer
-	def fd
-		@connection.fd
-	end
-
 	def close
 		return if @closed
 		r = LibIPC.ipc_close_all(self.pointer)
diff --git a/src/ipc/lowlevel.cr b/src/ipc/lowlevel.cr
index 600bd0d..1b04252 100644
--- a/src/ipc/lowlevel.cr
+++ b/src/ipc/lowlevel.cr
@@ -118,6 +118,10 @@ lib LibIPC
 	# Sending a message (will wait the fd to become available for IO operations).
 	fun ipc_write(Ctx*, Message*) : IPCError
 
+	# Sending a message NOW.
+	# WARNING: unbuffered send do not wait the fd to become available.
+	fun ipc_write_fd(Int32, Message*) : IPCError
+
 	# This function let the user get the default error message based on the error code.
 	# The error message is contained in the IPCError structure, this function should not be used, in most cases.
 	fun ipc_errors_get (LibC::Int) : LibC::Char*
diff --git a/tests/pongc.cr b/tests/pongc.cr
index 509c301..2d3e8ff 100644
--- a/tests/pongc.cr
+++ b/tests/pongc.cr
@@ -1,24 +1,101 @@
+require "option_parser"
 require "../src/ipc.cr"
+require "./prints.cr"
 
-client = IPC::Client.new "pong"
-
-server_fd = client.server_fd
-
-if server_fd.nil?
-	puts "there is no server_fd!!"
-	exit 1
+class CLI
+	class_property service_name           = "pong"
+	class_property message      : String? = nil
+	class_property type                   = 1
+	class_property user_type              = 42
+	class_property verbosity              = 1
+	class_property rounds                 = 1
 end
 
-message = IPC::Message.new server_fd, 1, 42.to_u8, "salut ça va ?"
+OptionParser.parse do |parser|
+	parser.on "-s service_name", "--service-name service_name", "URI" do |optsn|
+		CLI.service_name = optsn
+	end
 
-client.send message
+	parser.on "-v verbosity", "--verbosity verbosity", "Verbosity (0 = nothing is printed, 1 = only events, 2 = events and messages). Default: 1" do |optsn|
+		CLI.verbosity = optsn.to_i
+	end
 
-client.loop do |event|
-	case event
-	when IPC::Event::MessageReceived
-		puts "\033[32mthere is a message\033[00m"
-		puts event.message.to_s
-		client.close
-		exit
+	parser.on "-t message_type",
+		"--type message_type",
+		"(internal) message type." do |opt|
+		CLI.type = opt.to_i
+	end
+
+	parser.on "-u user_message_type",
+		"--user-type user_message_type",
+		"Message type." do |opt|
+		CLI.user_type = opt.to_i
+	end
+
+
+	parser.on "-r rounds", "--rounds count", "Number of messages sent." do |opt|
+		CLI.rounds = opt.to_i
+	end
+
+	parser.on "-m message", "--message m", "Message to sent." do |opt|
+		CLI.message = opt
+	end
+
+	parser.on "-h", "--help", "Show this help" do
+		puts parser
+		exit 0
 	end
 end
+
+def main
+	client = IPC::Client.new CLI.service_name
+	client.base_timer = 30_000 # 30 seconds
+	client.timer      = 30_000 # 30 seconds
+
+	server_fd = client.server_fd
+	if server_fd.nil?
+		puts "there is no server_fd!!"
+		exit 1
+	end
+
+	nb_messages_remaining = CLI.rounds
+
+	# Listening on STDIN.
+	client << 0
+
+	client.loop do |event|
+		case event
+		when IPC::Event::ExtraSocket
+			puts "extra socket fd #{event.fd}"
+			info "reading on #{event.fd}"
+			if event.fd == 0
+				puts "reading on STDIN"
+			end
+
+			mstr = if CLI.message.nil?
+				if event.fd == 0 STDIN.gets || "STDIN failed!" else "coucou" end
+			else
+				CLI.message.not_nil!
+			end
+
+			CLI.rounds.times do |i|
+				client.send server_fd.not_nil!, CLI.user_type.to_u8, mstr.to_slice
+			end
+		when IPC::Event::MessageReceived
+			nb_messages_remaining -= 1
+			info "new message from #{event.fd}: #{event.message.to_s}, remaining #{nb_messages_remaining}"
+			if nb_messages_remaining == 0
+				exit 0
+			end
+		when IPC::Event::Disconnection
+			info "Disconnection from #{event.fd}"
+			if event.fd == 0
+				client.remove_fd 0
+			end
+		else
+			info "unhandled event: #{event.class}"
+		end
+	end
+end
+
+main
diff --git a/tests/pongd.cr b/tests/pongd.cr
index b3c3314..4862716 100644
--- a/tests/pongd.cr
+++ b/tests/pongd.cr
@@ -1,22 +1,30 @@
 require "option_parser"
 require "../src/ipc.cr"
-require "./colors"
+require "./prints.cr"
 
-verbosity = 1
-service_name = "pong"
-no_response = false
+class CLI
+	class_property service_name = "pong"
+	class_property verbosity    = 1
+	class_property timer        = 30_000
+	class_property no_response  = false
+end
 
 OptionParser.parse do |parser|
 	parser.on "-s service_name", "--service-name service_name", "URI" do |optsn|
-		service_name = optsn
+		CLI.service_name = optsn
 	end
 
 	parser.on "-n", "--no-response", "Do not provide any response back." do
-		no_response = true
+		CLI.no_response = true
 	end
 
+	parser.on "-t timer", "--timer ms", "Timer in ms. Default: 30 000" do |optsn|
+		CLI.timer = optsn.to_i
+	end
+
+
 	parser.on "-v verbosity", "--verbosity verbosity", "Verbosity (0 = nothing is printed, 1 = only events, 2 = events and messages). Default: 1" do |optsn|
-		verbosity = optsn.to_i
+		CLI.verbosity = optsn.to_i
 	end
 
 	parser.on "-h", "--help", "Show this help" do
@@ -25,54 +33,46 @@ OptionParser.parse do |parser|
 	end
 end
 
-service = IPC::Server.new (service_name)
-service.base_timer = 5000 # 5 seconds
-service.timer      = 5000 # 5 seconds
+def main
+	service = IPC::Server.new CLI.service_name
+	service.base_timer = CLI.timer # default: 30 seconds
+	service.timer      = CLI.timer # default: 30 seconds
 
-service.loop do |event|
-	case event
-	when IPC::Event::Timer
-		if verbosity >= 1
-			puts "#{CORANGE}IPC::Event::Timer#{CRESET}"
-		end
-	when IPC::Event::Connection
-		if verbosity >= 1
-			puts "#{CBLUE}IPC::Event::Connection#{CRESET}, client: #{event.fd}"
-		end
-	when IPC::Event::Disconnection
-		if verbosity >= 1
-			puts "#{CBLUE}IPC::Event::Disconnection#{CRESET}, client: #{event.fd}"
-		end
-	when IPC::Event::MessageSent
-		begin
-			if verbosity >= 1
-				puts "#{CGREEN}IPC::Event::MessageSent#{CRESET}, client: #{event.fd}"
+	service.loop do |event|
+		# service.pp
+		case event
+		when IPC::Event::Timer
+			info "IPC::Event::Timer"
+		when IPC::Event::Connection
+			info "IPC::Event::Connection, client: #{event.fd}"
+		when IPC::Event::Disconnection
+			info "IPC::Event::Disconnection, client: #{event.fd}"
+		when IPC::Event::MessageSent
+			begin
+				info "IPC::Event::MessageSent, client: #{event.fd}"
+			rescue e
+				important "#{e.message}"
+				service.remove_fd event.fd
 			end
-		rescue e
-			puts "#{CRED}#{e.message}#{CRESET}"
-			service.remove_fd event.fd
-		end
-	when IPC::Event::MessageReceived
-		begin
-			if verbosity >= 1
-				puts "#{CGREEN}IPC::Event::MessageReceived#{CRESET}, client: #{event.fd}"
-				if verbosity >= 2
-					m = String.new event.message.payload
-					puts "#{CBLUE}message type #{event.message.utype}: #{m} #{CRESET}"
+		when IPC::Event::MessageReceived
+			begin
+				info "IPC::Event::MessageReceived, client: #{event.fd}"
+				m = String.new event.message.payload
+				debug "message type #{event.message.utype}: #{m}"
+
+				unless CLI.no_response
+					service.send event.message
+					debug "sending message..."
 				end
-			end
-			service.send event.message unless no_response
-			if verbosity >= 2 && ! no_response
-				puts "#{CBLUE}sending message...#{CRESET}"
-			end
 
-		rescue e
-			puts "#{CRED}#{e.message}#{CRESET}"
-			service.remove_fd event.fd
-		end
-	else
-		if verbosity >= 1
-			puts "#{CRED}Exception: message #{event} #{CRESET}"
+			rescue e
+				important "#{e.message}"
+				service.remove_fd event.fd
+			end
+		else
+			important "Exception: message #{event}"
 		end
 	end
 end
+
+main
diff --git a/tests/prints.cr b/tests/prints.cr
new file mode 100644
index 0000000..1770699
--- /dev/null
+++ b/tests/prints.cr
@@ -0,0 +1,13 @@
+require "./colors"
+
+def important(message : String)
+	puts "#{CRED}#{message}#{CRESET}"   if CLI.verbosity > 0
+end
+
+def info(message : String)
+	puts "#{CGREEN}#{message}#{CRESET}" if CLI.verbosity > 1
+end
+
+def debug(message : String)
+	puts "#{CBLUE}#{message}#{CRESET}"  if CLI.verbosity > 2
+end