send a binary json message to a tcp server in ruby

To send a binary JSON message to a TCP server in Ruby, you can use the socket library and the msgpack gem.

main.rb
require 'socket'
require 'msgpack'

# Encode a hash as a MessagePack binary string
msg = { foo: 'bar' }.to_msgpack

# Open a TCP socket to the server
socket = TCPSocket.new('localhost', 8080)

# Send the binary message to the server
socket.write(msg)

# Close the socket
socket.close
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In this example, we first use the to_msgpack method provided by the msgpack gem to encode a hash as a MessagePack binary string. Next, we open a TCP socket to the server using the TCPSocket.new method. Then, we send the binary message to the server using the write method on the socket object. Finally, we close the socket using the close method.

Note that you'll need to replace 'localhost' and 8080 with the hostname and port of your TCP server.