Bastion Remote Force

local function clearScreen()
  term.clear()
  term.setCursorPos(1, 1)
end

local modem = peripheral.find("modem") or error("No modem attached", 0)
modem.open(43) -- Open 43 so we can receive replies

-- Send our message
print("Enter your message:")
local userMessage = read()
modem.transmit(15, 43, userMessage)

-- And wait for a reply
local event, side, channel, replyChannel, message, distance
repeat
  event, side, channel, replyChannel, message, distance = os.pullEvent("modem_message")
until channel == 43

clearScreen()

print(tostring(message))