Hi all, I took a look into asio and "boost_asio/example/echo/async_tcp_echo_server.cpp". This example is clear. But I'm looking for something like an "async tcp echo client". The client should send every second one status message. Maybe client is not the correct word. My desired architecture should be "slave server" <--> "master server" where "master server" sends an "ACK" to "slave server" for every "DATA" packet "master server" receives. Something similar to an echo / ping pong server. Can someone provide hints or even an example for a "slave server" similar to "boost_asio/example/echo/async_tcp_echo_server.cpp"? Thanks in advance! Goran