computercraft ftp broadcaster

rednet.open("top")
term.clear()
term.setCursorPos(1, 1)
print("choix du fichier:")
choix = read()
h = fs.open(choix, "r")
local envoi = {"ftp", "envoi"}
term.clear()
term.setCursorPos(1, 1)
print("ou ?")
envoi[3] = read()
ec = 4
envoi[4] = h.readLine()
while envoi[ec] ~= nil do
 ec = ec + 1
 envoi[ec] = h.readLine()
end
send = textutils.serialize(envoi)
term.clear()
term.setCursorPos(1, 1)
print("pret a envoyer")
os.pullEvent("key")
rednet.broadcast(send)
term.clear()
term.setCursorPos(1, 1)
print("termine")