rednet.open("top")
while true do
    message=0
    os.queueEvent("randomEvent")
    os.pullEvent()
    print("do you want to receive or send a message?")
    print("1 for send and 2 for receive")
    a=read()
    a=tonumber(a)

    if a==1 then
        print("type your message")
        msg=read()
        rednet.broadcast(msg)
    end
end
rednet.open("top")
while true do
    message=0
    os.queueEvent("randomEvent")
    os.pullEvent()
    print("do you want to receive or send a message?")
    print("1 for send and 2 for receive")
    a=read()
    a=tonumber(a)

    if a==1 then
        print("type your message")
        msg=read()
        rednet.broadcast(msg)
    end

    if a==2 then
        print("waiting for the message")
        while message == 0 do
            id, message=rednet.receive()
            print("here is your message")
            print(message)
        end
    end
end