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local modem = peripheral.find("modem")

local event, side, channel, replyChannel, message, distance

function listener()
    while true do
        local event, modemSide, channel, replyChannel, message, distance = os.pullEvent()
        if event == "timer" then
            modem.close(i)
            print(i)
        elseif event == "modem_message" then
            print("aaaa")
            break
        end
    end
end

while true do
    for i = 0, 21 do
        os.startTimer(0)
        modem.open(i)
        print(i)
        listener()
    end
end