server w connection request

local modemSide = "top" -- Modify with your modem side

rednet.open(modemSide)
print("Server online. Waiting for connection...")

local function acceptConnection()
  while true do
    local senderId, message = rednet.receive()
    if message == "connect" then
      print("Incoming connection from ID: " .. senderId)
      print("Do you want to accept this connection? (yes/no)")
      local input = read()
      if input == "yes" then
        rednet.send(senderId, "accepted")
        return senderId
      else
        rednet.send(senderId, "rejected")
      end
    end
  end
end

local function startShell(clientId)
  print("Connection accepted. Starting shell.")
  print("Type 'exit' to disconnect.")
  while true do
    io.write("> ")
    local input = read()
    if input == "exit" then
      rednet.send(clientId, "exit")
      print("Shell closed.")
      return
    else
      rednet.send(clientId, input)
      local _, message = rednet.receive(5) -- Timeout of 5 seconds
      if message then
        print(message)
      else
        print("No response from client.")
      end
    end
  end
end

local clientId = acceptConnection()
if clientId then
  startShell(clientId)
end