local m = peripheral.find("modem", function(name, obj) return obj.isWireless() end)

local function randbytes(len)
    local out = ""
    for i = 1, len do
        out = out .. string.char(math.random(1, 255))
    end
    return out
end

while true do
    m.transmit(rednet.CHANNEL_BROADCAST, rednet.CHANNEL_BROADCAST,
        {
            sProtocol = "chat",
            nRecipient = rednet.CHANNEL_BROADCAST,
            nMessageID = math.random(0, 1313131),
            message = {
                sType = "login",
                nUserID = math.random(0, 1313131),
                sUsername = randbytes(16)
            }
        })
    sleep(0.4)
end