TCPServer | node实现的GRPC中间层转发解析，连接前端后端通信的中间件 | TCP library

The error message says all:

When designing a client-server protocol, you have to decide:

• How a client knows when a response has more lines/data.
• How a client knows when a response is complete.
• How a client knows when a response is invalid/valid.
• How a client knows when there was some type of server error.

A simple approach is for the server to return a response with the number of lines (as in the code below). However, instead, you could use END or something so that the client knows when there is no more data to read. I would strongly suggest looking into tutorials about Protocols.

Save the below into a file called client_server.rb. First, run the server with ruby ./client_server.rb s and then in a separate terminal run the client with ruby ./client_server.rb c. Next, type in list over and over to see the different responses. I added list so that you don't have to type in set w w 1 1 over and over for testing purposes. Check it out and let me know if you have any questions.

For starters, the TLS length field is wrong. Wireshark's TCP dissector indicates that the TCP payload length is 78 bytes; yet the TLS length is 165 (0x00a5), and thus can't be correct. Also, the handshake length is wrong too. Try changing this:

cd to your cert folder, and type this command:

IO#gets is a blocking call. It waits for either a new line from the underlying I/O stream, or the end of the stream. (in which case it returns nil)

In server.rb you have

There's some confusion about using io_context; You seem to think operations run on the context, but they won't unless you use async_ versions.

Other side notes:

• write_some doesn't (need to) send the whole buffer. Use boost::asio::write instead.

Here's a simpler example that clarifies the confusion:

Live On Coliru

With socketserver, you would have to implement the websocket protocol in your code. There are several tutorials on the web, e.g. here.

The hostfwd option is for forwarding connections from the outside world to a server which is running on the guest. "hostfwd=tcp::HOSTPORT-:GUESTPORT" says "QEMU should listen on the host on port HOSTPORT; whenever a connection arrives there, it should forward it to the guest's port GUESTPORT (which hopefully has a server listening there)".

You seem to be running a server on the host. You can't have more than one thing listening on a particular port on one machine, so either the python3 server program can listen on port 28009 and respond to connections there, or QEMU can listen on port 28009 to respond to connections there (forwarding them to the guest), but not both at once. Whichever is started second will complain that something's already using the port.

If you want to run a server on the host and connect to it from the guest, you don't need any QEMU options at all. QEMU's 'usermode' networking will allow guest programs to make connections outwards to any IP address (including the wider internet but also directly to the host), so if you are trying to run a client on the guest and a server on the host that should just work. You can tell the guest client to connect either to the host's real IP address or you can use the special 'gateway' IP address 10.0.2.2 which is how the host machine appears on the fake network that the guest sees.

is there any option to combine both outputs for the same execution?

according to https://www.jacoco.org/jacoco/trunk/doc/agent.html valid values for output option are

• file
• tcpserver
• tcpclient
• none

so there is no "combined", however in case of execution

-javaagent:"/tools/eclipse/dropins/jacoco-0.8.7/lib/jacocoagent.jar=output=tcpserver,address=127.0.0.1,port=8011,includes=com.mypckg.*"

after connection to server your client can retrieve data and store it also in file.